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StringUtils工具类介绍

  • 前言
  • 1.isEmpty()
  • 2.isNotEmpty()
  • 3.isAnyEmpty()
  • 4.isNoneEmpty()
  • 5.isBlank()
  • 6.isNotBlank()
  • 7.isAnyBlank()
  • 8.isNoneBlank()
  • 9.trim()
  • 10.trimToNull()
  • 11.trimToEmpty()
  • 12.strip()
  • 13.stripToNull()
  • 14.stripToEmpty()
  • 15.stripStart()
  • 16.stripEnd()
  • 17.stripAll()
  • 18.stripAccents()
  • 19.indexOf()
  • 20.indexOfIgnoreCase()
  • 21.ordinalIndexOf()
  • 22.lastIndexOf()
  • 23.lastOrdinalIndexOf()
  • 24.lastIndexOfIgnoreCase()
  • 25.equals()
  • 26.equalsIgnoreCase()
  • 27.contains()
  • 28.containsIgnoreCase()
  • 29.containsWhitespace()
  • 30.indexOfAny()
  • 31.containsAny()
  • 32.indexOfAnyBut()
  • 33.containsOnly()
  • 34.containsNone()
  • 35.indexOfAny()
  • 36.lastIndexOfAny()
  • 37.substring()
  • 38.left()
  • 39.right()
  • 40.mid()
  • 41.substringBefore()
  • 42.substringAfter()
  • 43.substringBeforeLast()
  • 44.substringAfterLast()
  • 45.substringBetween()
  • 46.substringsBetween()
  • 47.split()
  • 48.splitByWholeSeparator()和splitByWholeSeparatorPreserveAllTokens()
  • 49.splitPreserveAllTokens()
  • 50.splitByCharacterType()
  • 51.splitByCharacterTypeCamelCase()
  • 52.join()
  • 53.deleteWhitespace()
  • 54.removeStart()
  • 55.removeStartIgnoreCase()
  • 56.removeEnd()
  • 57.removeEndIgnoreCase()
  • 58.remove
  • 59.replaceOnce()
  • 60.replacePattern()
  • 61.removePattern()
  • 62.replace()
  • 63.replaceEach()
  • 64.replaceEachRepeatedly()
  • 65.replaceChars()
  • 66.overlay()
  • 67.chomp()
  • 68.chop()
  • 69.repeat()
  • 70.rightPad()
  • 71.leftPad()
  • 72.center()
  • 73.upperCase()
  • 74.lowerCase()
  • 75.capitalize()
  • 76.uncapitalize()
  • 77.swapCase()
  • 78.countMatches()
  • 79.reverse()
  • 80.reverseDelimited()
  • 81.difference()
  • 82.indexOfDifference()
  • 83.toEncodedString()

前言

不多逼逼，直接开始

1.isEmpty()

描述：null与空串是empty的判断依据。

* StringUtils.isEmpty(null) = true
* StringUtils.isEmpty("") = true
* StringUtils.isEmpty(" ") = false
* StringUtils.isEmpty("bob") = false

2.isNotEmpty()

描述：对isEmpty()取反

* StringUtils.isNotEmpty(null) = false
* StringUtils.isNotEmpty("") = false
* StringUtils.isNotEmpty(" ") = true
* StringUtils.isNotEmpty("bob") = true

3.isAnyEmpty()

描述：isAnyEmpty只要有一个字符串为empty，返回值就为true。

* StringUtils.isAnyEmpty(null) = true
* StringUtils.isAnyEmpty(null, "foo") = true
* StringUtils.isAnyEmpty("", "bar") = true
* StringUtils.isAnyEmpty("bob", "") = true
* StringUtils.isAnyEmpty("  bob  ", null) = true
* StringUtils.isAnyEmpty(" ", "bar") = false
* StringUtils.isAnyEmpty("foo", "bar") = false

4.isNoneEmpty()

描述：null与空串是empty的判断依据。

* StringUtils.isNoneEmpty(null) = false
* StringUtils.isNoneEmpty(null, "foo") = false
* StringUtils.isNoneEmpty("", "bar") = false
* StringUtils.isNoneEmpty("bob", "") = false
* StringUtils.isNoneEmpty("  bob  ", null) = false
* StringUtils.isNoneEmpty(" ", "bar") = true
* StringUtils.isNoneEmpty("foo", "bar") = true

5.isBlank()

描述：blank的判断依据是在empty的基础上添加一个空白符（即空格）。也就是说，null、空串、只包含空白符就是blank，isblank返回true。

* StringUtils.isBlank(null) = true
* StringUtils.isBlank("") = true
* StringUtils.isBlank(" ")  = true
* StringUtils.isBlank("bob") = false
* StringUtils.isBlank("  bob  ") = false

6.isNotBlank()

描述：是对isBlank()取反。

* StringUtils.isNotBlank(null) = false
* StringUtils.isNotBlank("")   = false
* StringUtils.isNotBlank(" ")  = false
* StringUtils.isNotBlank("bob")= true
* StringUtils.isNotBlank("  bob  ") = true

7.isAnyBlank()

描述：只要有一个字符为空白符，就返回true。

* StringUtils.isAnyBlank(null)   = true
* StringUtils.isAnyBlank(null, "foo") = true
* StringUtils.isAnyBlank(null, null)  = true
* StringUtils.isAnyBlank("", "bar")   = true
* StringUtils.isAnyBlank("bob", "")   = true
* StringUtils.isAnyBlank("  bob  ", null)  = true
* StringUtils.isAnyBlank(" ", "bar")  = true
* StringUtils.isAnyBlank("foo", "bar")= false

8.isNoneBlank()

描述：对isAnyBlank取反。

* StringUtils.isNoneBlank(null)   = false
* StringUtils.isNoneBlank(null, "foo") = false
* StringUtils.isNoneBlank(null, null)  = false
* StringUtils.isNoneBlank("", "bar")   = false
* StringUtils.isNoneBlank("bob", "")   = false
* StringUtils.isNoneBlank("  bob  ", null)  = false
* StringUtils.isNoneBlank(" ", "bar")  = false
* StringUtils.isNoneBlank("foo", "bar")= true

9.trim()

描述：trim功能是修剪字符串两边的空格，修剪后的空串会保持空串。

* StringUtils.trim(null)= null
* StringUtils.trim("")  = ""
* StringUtils.trim("")  = ""
* StringUtils.trim("abc")    = "abc"
* StringUtils.trim("    abc    ") = "abc"

10.trimToNull()

描述：trimToNull在trim的基础上，将修剪后的空串转化为null。

* StringUtils.trimToNull(null)= null
* StringUtils.trimToNull("")  = null
* StringUtils.trimToNull("")  = null
* StringUtils.trimToNull("abc")    = "abc"
* StringUtils.trimToNull("    abc    ") = "abc"

11.trimToEmpty()

描述：trimToEmpty在trim的基础上，将修剪后的null转化为空串。

* StringUtils.trimToEmpty(null)= ""
* StringUtils.trimToEmpty("")  = ""
* StringUtils.trimToEmpty("")  = ""
* StringUtils.trimToEmpty("abc")    = "abc"
* StringUtils.trimToEmpty("    abc    ") = "abc"

12.strip()

描述：strip功能与trim对应，有两个参数的strip重载则可以指定要在字符串开头与结尾需要删除的字符串。

* StringUtils.strip(null)= null
* StringUtils.strip("")  = ""
* StringUtils.strip("   ")    = ""
* StringUtils.strip("abc")    = "abc"
* StringUtils.strip("  abc")  = "abc"
* StringUtils.strip("abc  ")  = "abc"
* StringUtils.strip(" abc ")  = "abc"
* StringUtils.strip(" ab c ") = "ab c"
* StringUtils.strip(null, *)= null
* StringUtils.strip("", *)  = ""
* StringUtils.strip("abc", null) = "abc"
* StringUtils.strip("  abc", null)    = "abc"
* StringUtils.strip("abc  ", null)    = "abc"
* StringUtils.strip(" abc ", null)    = "abc"
* StringUtils.strip("  abcyx", "xyz") = "  abc"

13.stripToNull()

描述：stripToNull功能与trimToNull对应，有两个参数的strip重载则可以指定要在字符串开头与结尾需要删除的字符串。

* StringUtils.stripToNull(null)= null
* StringUtils.stripToNull("")  = null
* StringUtils.stripToNull("   ")    = null
* StringUtils.stripToNull("abc")    = "abc"
* StringUtils.stripToNull("  abc")  = "abc"
* StringUtils.stripToNull("abc  ")  = "abc"
* StringUtils.stripToNull(" abc ")  = "abc"
* StringUtils.stripToNull(" ab c ") = "ab c"

14.stripToEmpty()

描述：stripToEmpty功能与trimToEmpty对应，有两个参数的strip重载则可以指定要在字符串开头与结尾需要删除的字符串。

* StringUtils.stripToEmpty(null)= ""
* StringUtils.stripToEmpty("")  = ""
* StringUtils.stripToEmpty("   ")    = ""
* StringUtils.stripToEmpty("abc")    = "abc"
* StringUtils.stripToEmpty("  abc")  = "abc"
* StringUtils.stripToEmpty("abc  ")  = "abc"
* StringUtils.stripToEmpty(" abc ")  = "abc"
* StringUtils.stripToEmpty(" ab c ") = "ab c"

15.stripStart()

描述：stripStart是实现在字符串开头删除指定的字符串。也就是strip系列方法的主要实现依赖之一。

* StringUtils.stripStart(null, *)= null
* StringUtils.stripStart("", *)  = ""
* StringUtils.stripStart("abc", "")   = "abc"
* StringUtils.stripStart("abc", null) = "abc"
* StringUtils.stripStart("  abc", null)    = "abc"
* StringUtils.stripStart("abc  ", null)    = "abc  "
* StringUtils.stripStart(" abc ", null)    = "abc "
* StringUtils.stripStart("yxabc  ", "xyz") = "abc  "

16.stripEnd()

描述：stripEnd是实现在字符串结尾删除指定的字符串。也就是strip系列方法的主要实现依赖之一。

* StringUtils.stripEnd(null, *)= null
* StringUtils.stripEnd("", *)  = ""
* StringUtils.stripEnd("abc", "")   = "abc"
* StringUtils.stripEnd("abc", null) = "abc"
* StringUtils.stripEnd("  abc", null)    = "  abc"
* StringUtils.stripEnd("abc  ", null)    = "abc"
* StringUtils.stripEnd(" abc ", null)    = " abc"
* StringUtils.stripEnd("  abcyx", "xyz") = "  abc"
* StringUtils.stripEnd("120.00", ".0")   = "12"

17.stripAll()

描述：stripAll有默认删除字符串数组的前后空格功能与删除指定的前后字符串的重载方法。

* StringUtils.stripAll(null)   = null
* StringUtils.stripAll([])= []
* StringUtils.stripAll(["abc", "  abc"]) = ["abc", "abc"]
* StringUtils.stripAll(["abc  ", null])  = ["abc", null]
* StringUtils.stripAll(null, *) = null
* StringUtils.stripAll([], *)   = []
* StringUtils.stripAll(["abc", "  abc"], null) = ["abc", "abc"]
* StringUtils.stripAll(["abc  ", null], null)  = ["abc", null]
* StringUtils.stripAll(["abc  ", null], "yz")  = ["abc  ", null]
* StringUtils.stripAll(["yabcz", null], "yz")  = ["abc", null]

18.stripAccents()

描述：stripAccents是删除关于发音的字符，我们基本不会用到。

* StringUtils.stripAccents(null) = null
* StringUtils.stripAccents("")   = ""
* StringUtils.stripAccents("control") = "control"
* StringUtils.stripAccents("éclair")= "eclair"

19.indexOf()

描述：indexOf有四个重载，功能分别为：查找字符序列第一个匹配的字符的位置；根据指定的开始位置，查找字符序列第一个匹配的字符的位置；查找字符序列第一个匹配的字符序列的位置；根据指定的开始位置，查找字符序列第一个匹配的字符序列的位置；

* StringUtils.indexOf(null, *)    = -1
* StringUtils.indexOf("", *) = -1
* StringUtils.indexOf("aabaabaa", 'a') = 0
* StringUtils.indexOf("aabaabaa", 'b') = 2

* StringUtils.indexOf(null, *, *)= -1
* StringUtils.indexOf("", *, *)  = -1
* StringUtils.indexOf("aabaabaa", 'b', 0)  = 2
* StringUtils.indexOf("aabaabaa", 'b', 3)  = 5
* StringUtils.indexOf("aabaabaa", 'b', 9)  = -1
* StringUtils.indexOf("aabaabaa", 'b', -1) = 2

* StringUtils.indexOf(null, *)= -1
* StringUtils.indexOf(*, null)= -1
* StringUtils.indexOf("", "") = 0
* StringUtils.indexOf("", *)  = -1 (except when * = "")
* StringUtils.indexOf("aabaabaa", "a")  = 0
* StringUtils.indexOf("aabaabaa", "b")  = 2
* StringUtils.indexOf("aabaabaa", "ab") = 1
* StringUtils.indexOf("aabaabaa", "")   = 0

* StringUtils.indexOf(null, *, *)= -1
* StringUtils.indexOf(*, null, *)= -1
* StringUtils.indexOf("", "", 0) = 0
* StringUtils.indexOf("", *, 0)  = -1 (except when * = "")
* StringUtils.indexOf("aabaabaa", "a", 0)  = 0
* StringUtils.indexOf("aabaabaa", "b", 0)  = 2
* StringUtils.indexOf("aabaabaa", "ab", 0) = 1
* StringUtils.indexOf("aabaabaa", "b", 3)  = 5
* StringUtils.indexOf("aabaabaa", "b", 9)  = -1
* StringUtils.indexOf("aabaabaa", "b", -1) = 2
* StringUtils.indexOf("aabaabaa", "", 2)   = 2
* StringUtils.indexOf("abc", "", 9)   = 3

20.indexOfIgnoreCase()

描述：indexOfIgnoreCase有二个重载，是indexOf两个方法忽略大小写的实现。功能分别为：不区分大小写地查找字符序列第一个匹配的字符序列的位置；根据指定的开始位置，不分大小写地查找字符序列第一个匹配的字符序列的位置；

* StringUtils.indexOfIgnoreCase(null, *)= -1
* StringUtils.indexOfIgnoreCase(*, null)= -1
* StringUtils.indexOfIgnoreCase("", "") = 0
* StringUtils.indexOfIgnoreCase("aabaabaa", "a")  = 0
* StringUtils.indexOfIgnoreCase("aabaabaa", "b")  = 2
* StringUtils.indexOfIgnoreCase("aabaabaa", "ab") = 1

* StringUtils.indexOfIgnoreCase(null, *, *)= -1
* StringUtils.indexOfIgnoreCase(*, null, *)= -1
* StringUtils.indexOfIgnoreCase("", "", 0) = 0
* StringUtils.indexOfIgnoreCase("aabaabaa", "A", 0)  = 0
* StringUtils.indexOfIgnoreCase("aabaabaa", "B", 0)  = 2
* StringUtils.indexOfIgnoreCase("aabaabaa", "AB", 0) = 1
* StringUtils.indexOfIgnoreCase("aabaabaa", "B", 3)  = 5
* StringUtils.indexOfIgnoreCase("aabaabaa", "B", 9)  = -1
* StringUtils.indexOfIgnoreCase("aabaabaa", "B", -1) = 2
* StringUtils.indexOfIgnoreCase("aabaabaa", "", 2)   = 2
* StringUtils.indexOfIgnoreCase("abc", "", 9)   = 3

21.ordinalIndexOf()

描述：在indexOf的基础上添加了一个序数参数，功能分别为：根据指定的开序数，查找字符序列第序数个匹配的字符的位置。

* StringUtils.ordinalIndexOf(null, *, *)= -1
* StringUtils.ordinalIndexOf(*, null, *)= -1
* StringUtils.ordinalIndexOf("", "", *) = 0
* StringUtils.ordinalIndexOf("aabaabaa", "a", 1)  = 0
* StringUtils.ordinalIndexOf("aabaabaa", "a", 2)  = 1
* StringUtils.ordinalIndexOf("aabaabaa", "b", 1)  = 2
* StringUtils.ordinalIndexOf("aabaabaa", "b", 2)  = 5
* StringUtils.ordinalIndexOf("aabaabaa", "ab", 1) = 1
* StringUtils.ordinalIndexOf("aabaabaa", "ab", 2) = 4
* StringUtils.ordinalIndexOf("aabaabaa", "", 1)   = 0
* StringUtils.ordinalIndexOf("aabaabaa", "", 2)   = 0

22.lastIndexOf()

描述：lastIndexOf有四个重载，功能分别为：查找字符序列最后一个匹配的字符的位置；根据指定的结束位置，查找字符序列最后一个匹配的字符的位置；查找字符序列最后一个匹配的字符序列的位置；根据指定的结束位置，查找字符序列最后一个匹配的字符序列的位置；

* StringUtils.lastIndexOf(null, *)    = -1
* StringUtils.lastIndexOf("", *) = -1
* StringUtils.lastIndexOf("aabaabaa", 'a') = 7
* StringUtils.lastIndexOf("aabaabaa", 'b') = 5

* StringUtils.lastIndexOf(null, *, *)= -1
* StringUtils.lastIndexOf("", *,  *) = -1
* StringUtils.lastIndexOf("aabaabaa", 'b', 8)  = 5
* StringUtils.lastIndexOf("aabaabaa", 'b', 4)  = 2
* StringUtils.lastIndexOf("aabaabaa", 'b', 0)  = -1
* StringUtils.lastIndexOf("aabaabaa", 'b', 9)  = 5
* StringUtils.lastIndexOf("aabaabaa", 'b', -1) = -1
* StringUtils.lastIndexOf("aabaabaa", 'a', 0)  = 0

* StringUtils.lastIndexOf(null, *)= -1
* StringUtils.lastIndexOf(*, null)= -1
* StringUtils.lastIndexOf("", "") = 0
* StringUtils.lastIndexOf("aabaabaa", "a")  = 7
* StringUtils.lastIndexOf("aabaabaa", "b")  = 5
* StringUtils.lastIndexOf("aabaabaa", "ab") = 4
* StringUtils.lastIndexOf("aabaabaa", "")   = 8

* StringUtils.lastIndexOf(null, *, *)= -1
* StringUtils.lastIndexOf(*, null, *)= -1
* StringUtils.lastIndexOf("aabaabaa", "a", 8)  = 7
* StringUtils.lastIndexOf("aabaabaa", "b", 8)  = 5
* StringUtils.lastIndexOf("aabaabaa", "ab", 8) = 4
* StringUtils.lastIndexOf("aabaabaa", "b", 9)  = 5
* StringUtils.lastIndexOf("aabaabaa", "b", -1) = -1
* StringUtils.lastIndexOf("aabaabaa", "a", 0)  = 0
* StringUtils.lastIndexOf("aabaabaa", "b", 0)  = -1
* StringUtils.lastIndexOf("aabaabaa", "b", 1)  = -1
* StringUtils.lastIndexOf("aabaabaa", "b", 2)  = 2
* StringUtils.lastIndexOf("aabaabaa", "ba", 2)  = -1
* StringUtils.lastIndexOf("aabaabaa", "ba", 2)  = 2

23.lastOrdinalIndexOf()

描述：lastOrdinalIndexOf可以参考OrdinalIndexOf，查找的是倒数ordinal个匹配的字符序列。

 * StringUtils.lastOrdinalIndexOf(null, *, *)= -1
* StringUtils.lastOrdinalIndexOf(*, null, *)= -1
* StringUtils.lastOrdinalIndexOf("", "", *) = 0
* StringUtils.lastOrdinalIndexOf("aabaabaa", "a", 1)  = 7
* StringUtils.lastOrdinalIndexOf("aabaabaa", "a", 2)  = 6
* StringUtils.lastOrdinalIndexOf("aabaabaa", "b", 1)  = 5
* StringUtils.lastOrdinalIndexOf("aabaabaa", "b", 2)  = 2
* StringUtils.lastOrdinalIndexOf("aabaabaa", "ab", 1) = 4
* StringUtils.lastOrdinalIndexOf("aabaabaa", "ab", 2) = 1
* StringUtils.lastOrdinalIndexOf("aabaabaa", "", 1)   = 8
* StringUtils.lastOrdinalIndexOf("aabaabaa", "", 2)   = 8

24.lastIndexOfIgnoreCase()

描述：lastIndexOfIgnoreCase有两个重载方法，可以参考indexOfIgnoreCase。功能分别为，在忽略大小写的情况下，查找最后一个匹配的字符序列的位置；根据所给的结束位置，在忽略大小写的情况下，查找最后一个匹配的字符序列的位置

* StringUtils.lastIndexOfIgnoreCase(null, *)= -1
* StringUtils.lastIndexOfIgnoreCase(*, null)= -1
* StringUtils.lastIndexOfIgnoreCase("aabaabaa", "A")  = 7
* StringUtils.lastIndexOfIgnoreCase("aabaabaa", "B")  = 5
* StringUtils.lastIndexOfIgnoreCase("aabaabaa", "AB") = 4

* StringUtils.lastIndexOfIgnoreCase(null, *, *)= -1
* StringUtils.lastIndexOfIgnoreCase(*, null, *)= -1
* StringUtils.lastIndexOfIgnoreCase("aabaabaa", "A", 8)  = 7
* StringUtils.lastIndexOfIgnoreCase("aabaabaa", "B", 8)  = 5
* StringUtils.lastIndexOfIgnoreCase("aabaabaa", "AB", 8) = 4
* StringUtils.lastIndexOfIgnoreCase("aabaabaa", "B", 9)  = 5
* StringUtils.lastIndexOfIgnoreCase("aabaabaa", "B", -1) = -1
* StringUtils.lastIndexOfIgnoreCase("aabaabaa", "A", 0)  = 0
* StringUtils.lastIndexOfIgnoreCase("aabaabaa", "B", 0)  = -1

25.equals()

描述：equals是判断两个字符序列是否相等。

* StringUtils.equals(null, null)   = true
* StringUtils.equals(null, "abc")  = false
* StringUtils.equals("abc", null)  = false
* StringUtils.equals("abc", "abc") = true
* StringUtils.equals("abc", "ABC") = false

26.equalsIgnoreCase()

描述：equalsIgnoreCase是不区分大小写地判断两个字符序列是否相等。

* StringUtils.equalsIgnoreCase(null, null)   = true
* StringUtils.equalsIgnoreCase(null, "abc")  = false
* StringUtils.equalsIgnoreCase("abc", null)  = false
* StringUtils.equalsIgnoreCase("abc", "abc") = true
* StringUtils.equalsIgnoreCase("abc", "ABC") = true

27.contains()

描述：字符序列seq是否包含字符searchChar，包含返回true，不包含返回false

* StringUtils.contains(null, *)= false
* StringUtils.contains(*, null)= false
* StringUtils.contains("", "") = true
* StringUtils.contains("abc", "")   = true
* StringUtils.contains("abc", "a")  = true
* StringUtils.contains("abc", "z")  = false
* StringUtils.contains("", *) = false

28.containsIgnoreCase()

描述：在忽略大小写的前提下，字符序列str是否包含字符序列searchStr，包含返回true，不包含返回false。

* StringUtils.contains(null, *) = false
* StringUtils.contains(*, null) = false
* StringUtils.contains("", "") = true
* StringUtils.contains("abc", "") = true
* StringUtils.contains("abc", "a") = true
* StringUtils.contains("abc", "z") = false
* StringUtils.contains("abc", "A") = true
* StringUtils.contains("abc", "Z") = false

29.containsWhitespace()

描述：判断字符序列是否包含空格，包含返回true，否则返回false

* StringUtils.containsWhitespace("abc") = false;
* StringUtils.containsWhitespace("ab c") = true;

30.indexOfAny()

描述：根据给定的字符数组或字符串，在字符序列中返回第一个匹配的字符数组或字符串的任意字符的位置。

* StringUtils.indexOfAny(null, *) = -1
* StringUtils.indexOfAny("", *)   = -1
* StringUtils.indexOfAny(*, null) = -1
* StringUtils.indexOfAny(*, [])   = -1
* StringUtils.indexOfAny("zzabyycdxx",['z','a']) = 0
* StringUtils.indexOfAny("zzabyycdxx",['b','y']) = 3
* StringUtils.indexOfAny("aba", ['z']) = -1
* 
* StringUtils.indexOfAny(*, "")    = -1
* StringUtils.indexOfAny("zzabyycdxx", "za") = 0
* StringUtils.indexOfAny("zzabyycdxx", "by") = 3
* StringUtils.indexOfAny("aba","z")= -1

31.containsAny()

描述：根据给定的字符数组或字符串，在字符序列中判断是否包含任意一个字符数组或字符串的字符，包含返回true，否则返回false。

* StringUtils.containsAny(null, *) = false
* StringUtils.containsAny("", *)   = false
* StringUtils.containsAny(*, null) = false
* StringUtils.containsAny(*, [])   = false
* StringUtils.containsAny("zzabyycdxx",['z','a']) = true
* StringUtils.containsAny("zzabyycdxx",['b','y']) = true
* StringUtils.containsAny("aba", ['z']) = false

* StringUtils.containsAny(null, *)  = false
* StringUtils.containsAny("", *)    = false
* StringUtils.containsAny(*, null)  = false
* StringUtils.containsAny(*, "")    = false
* StringUtils.containsAny("zzabyycdxx", "za") = true
* StringUtils.containsAny("zzabyycdxx", "by") = true
* StringUtils.containsAny("aba","z")= false

32.indexOfAnyBut()

描述：在字符序列cs中，查找第一个匹配的不在所给字符数组/字符序列searchChars中的字符的位置。

* StringUtils.indexOfAnyBut(null, *)= -1
* StringUtils.indexOfAnyBut("", *)  = -1
* StringUtils.indexOfAnyBut(*, null)= -1
* StringUtils.indexOfAnyBut(*, [])  = -1
* StringUtils.indexOfAnyBut("zzabyycdxx", new char[] {'z', 'a'} ) = 3
* StringUtils.indexOfAnyBut("aba", new char[] {'z'} )   = 0
* StringUtils.indexOfAnyBut("aba", new char[] {'a', 'b'} )   = -1

* StringUtils.indexOfAnyBut(null, *)  = -1
* StringUtils.indexOfAnyBut("", *)    = -1
* StringUtils.indexOfAnyBut(*, null)  = -1
* StringUtils.indexOfAnyBut(*, "")    = -1
* StringUtils.indexOfAnyBut("zzabyycdxx", "za") = 3
* StringUtils.indexOfAnyBut("zzabyycdxx", "")   = -1
* StringUtils.indexOfAnyBut("aba","ab")    = -1

33.containsOnly()

描述：判断字符序列cs是否只包含字符数组或字符串valid给定的字符。只包含则返回true，还有其他字符则返回false。

* StringUtils.containsOnly(null, *)  = false
* StringUtils.containsOnly(*, null)  = false
* StringUtils.containsOnly("", *)    = true
* StringUtils.containsOnly("ab", '') = false
* StringUtils.containsOnly("abab", 'abc') = true
* StringUtils.containsOnly("ab1", 'abc')  = false
* StringUtils.containsOnly("abz", 'abc')  = false

* StringUtils.containsOnly(null, *)  = false
* StringUtils.containsOnly(*, null)  = false
* StringUtils.containsOnly("", *)    = true
* StringUtils.containsOnly("ab", "") = false
* StringUtils.containsOnly("abab", "abc") = true
* StringUtils.containsOnly("ab1", "abc")  = false
* StringUtils.containsOnly("abz", "abc")  = false

34.containsNone()

描述：检查字符序列cs是否不包含字符数组或字符串searchChars的字符。不包含返回true，包含返回false。

* StringUtils.containsNone(null, *)  = true
* StringUtils.containsNone(*, null)  = true
* StringUtils.containsNone("", *)    = true
* StringUtils.containsNone("ab", '') = true
* StringUtils.containsNone("abab", 'xyz') = true
* StringUtils.containsNone("ab1", 'xyz')  = true
* StringUtils.containsNone("abz", 'xyz')  = false

* StringUtils.containsNone(null, *)  = true
* StringUtils.containsNone(*, null)  = true
* StringUtils.containsNone("", *)    = true
* StringUtils.containsNone("ab", "") = true
* StringUtils.containsNone("abab", "xyz") = true
* StringUtils.containsNone("ab1", "xyz")  = true
* StringUtils.containsNone("abz", "xyz")  = false

35.indexOfAny()

描述：根据给定的字符序列数组searchStrs，在字符序列str中查找第一个匹配的任意一个字符序列数组的字符序列的位置。

* StringUtils.indexOfAny(null, *) = -1
* StringUtils.indexOfAny(*, null) = -1
* StringUtils.indexOfAny(*, [])   = -1
* StringUtils.indexOfAny("zzabyycdxx", ["ab","cd"])   = 2
* StringUtils.indexOfAny("zzabyycdxx", ["cd","ab"])   = 2
* StringUtils.indexOfAny("zzabyycdxx", ["mn","op"])   = -1
* StringUtils.indexOfAny("zzabyycdxx", ["zab","aby"]) = 1
* StringUtils.indexOfAny("zzabyycdxx", [""])= 0
* StringUtils.indexOfAny("", [""])= 0
* StringUtils.indexOfAny("", ["a"])    = -1

36.lastIndexOfAny()

描述：根据给定的字符序列数组searchStrs，在字符序列str中查找最后一个匹配的任意一个字符序列数组的字符序列的位置。

* StringUtils.lastIndexOfAny(null, *)    = -1
* StringUtils.lastIndexOfAny(*, null)    = -1
* StringUtils.lastIndexOfAny(*, []) = -1
* StringUtils.lastIndexOfAny(*, [null])  = -1
* StringUtils.lastIndexOfAny("zzabyycdxx", ["ab","cd"]) = 6
* StringUtils.lastIndexOfAny("zzabyycdxx", ["cd","ab"]) = 6
* StringUtils.lastIndexOfAny("zzabyycdxx", ["mn","op"]) = -1
* StringUtils.lastIndexOfAny("zzabyycdxx", ["mn","op"]) = -1
* StringUtils.lastIndexOfAny("zzabyycdxx", ["mn",""])   = 10

37.substring()

描述：根据所给的start和end截取字符串str，半开半闭、有前无后。

* StringUtils.substring(null, *)   = null
* StringUtils.substring("", *)= ""
* StringUtils.substring("abc", 0)  = "abc"
* StringUtils.substring("abc", 2)  = "c"
* StringUtils.substring("abc", 4)  = ""
* StringUtils.substring("abc", -2) = "bc"
* StringUtils.substring("abc", -4) = "abc"

* StringUtils.substring(null, *, *)    = null
* StringUtils.substring("", * ,  *)    = "";
* StringUtils.substring("abc", 0, 2)   = "ab"
* StringUtils.substring("abc", 2, 0)   = ""
* StringUtils.substring("abc", 2, 4)   = "c"
* StringUtils.substring("abc", 4, 6)   = ""
* StringUtils.substring("abc", 2, 2)   = ""
* StringUtils.substring("abc", -2, -1) = "b"
* StringUtils.substring("abc", -4, 2)  = "ab"

38.left()

描述：跟据所给的pos与len分别获取字符串左边str的字符，长度都为len。

* StringUtils.left(null, *)    = null
* StringUtils.left(*, -ve)= ""
* StringUtils.left("", *) = ""
* StringUtils.left("abc", 0)   = ""
* StringUtils.left("abc", 2)   = "ab"
* StringUtils.left("abc", 4)   = "abc"

39.right()

描述：跟据所给的pos与len分别获取字符串str右边的字符，长度都为len。

* StringUtils.right(null, *)    = null
* StringUtils.right(*, -ve)= ""
* StringUtils.right("", *) = ""
* StringUtils.right("abc", 0)   = ""
* StringUtils.right("abc", 2)   = "bc"
* StringUtils.right("abc", 4)   = "abc"

40.mid()

描述：跟据所给的pos与len分别获取字符串str中间的字符，长度都为len

 * StringUtils.mid(null, *, *)    = null
* StringUtils.mid(*, *, -ve)= ""
* StringUtils.mid("", 0, *) = ""
* StringUtils.mid("abc", 0, 2)   = "ab"
* StringUtils.mid("abc", 0, 4)   = "abc"
* StringUtils.mid("abc", 2, 4)   = "c"
* StringUtils.mid("abc", 4, 2)   = ""
* StringUtils.mid("abc", -2, 2)  = "ab"

41.substringBefore()

描述： substringBefore会返回匹配的第一个分隔符separator之前不包含分隔符的字符串。

* StringUtils.substringBefore(null, *) = null
* StringUtils.substringBefore("", *)   = ""
* StringUtils.substringBefore("abc", "a")   = ""
* StringUtils.substringBefore("abcba", "b") = "a"
* StringUtils.substringBefore("abc", "c")   = "ab"
* StringUtils.substringBefore("abc", "d")   = "abc"
* StringUtils.substringBefore("abc", "")    = ""
* StringUtils.substringBefore("abc", null)  = "abc"

42.substringAfter()

描述： substringAfter会返回匹配的第一个分隔符separator之后不包含分隔符的字符串。

* StringUtils.substringAfter(null, *) = null
* StringUtils.substringAfter("", *)   = ""
* StringUtils.substringAfter(*, null) = ""
* StringUtils.substringAfter("abc", "a")   = "bc"
* StringUtils.substringAfter("abcba", "b") = "cba"
* StringUtils.substringAfter("abc", "c")   = ""
* StringUtils.substringAfter("abc", "d")   = ""
* StringUtils.substringAfter("abc", "")    = "abc"

43.substringBeforeLast()

描述：substringBeforeLast会返回匹配的最后一个分隔符separator之前不包含分隔符的字符串。

* StringUtils.substringBeforeLast(null, *) = null
* StringUtils.substringBeforeLast("", *)   = ""
* StringUtils.substringBeforeLast("abcba", "b") = "abc"
* StringUtils.substringBeforeLast("abc", "c")   = "ab"
* StringUtils.substringBeforeLast("a", "a")= ""
* StringUtils.substringBeforeLast("a", "z")= "a"
* StringUtils.substringBeforeLast("a", null)    = "a"
* StringUtils.substringBeforeLast("a", "") = "a"

44.substringAfterLast()

描述：substringAfterLast会返回匹配的最后一个分隔符separator之后不包含分隔符的字符串。

* StringUtils.substringAfterLast(null, *) = null
* StringUtils.substringAfterLast("", *)   = ""
* StringUtils.substringAfterLast(*, "")   = ""
* StringUtils.substringAfterLast(*, null) = ""
* StringUtils.substringAfterLast("abc", "a")   = "bc"
* StringUtils.substringAfterLast("abcba", "b") = "a"
* StringUtils.substringAfterLast("abc", "c")   = ""
* StringUtils.substringAfterLast("a", "a")= ""
* StringUtils.substringAfterLast("a", "z")= ""

45.substringBetween()

描述：substringBetween的两个重载功能分别为：根据传入的tag来截取两个tag间的子字符串，仅返回首次匹配到的子字符串。根据传入的字符串open与字符串close来截取子字符串，仅返回首次匹配到的子字符串。

* StringUtils.substringBetween(null, *)  = null
* StringUtils.substringBetween("", "")   = ""
* StringUtils.substringBetween("", "tag")= null
* StringUtils.substringBetween("tagabctag", null)  = null
* StringUtils.substringBetween("tagabctag", "")    = ""
* StringUtils.substringBetween("tagabctag", "tag") = "abc"

* StringUtils.substringBetween("wx[b]yz", "[", "]") = "b"
* StringUtils.substringBetween(null, *, *)= null
* StringUtils.substringBetween(*, null, *)= null
* StringUtils.substringBetween(*, *, null)= null
* StringUtils.substringBetween("", "", "")= ""
* StringUtils.substringBetween("", "", "]")    = null
* StringUtils.substringBetween("", "[", "]")   = null
* StringUtils.substringBetween("yabcz", "", "")= ""
* StringUtils.substringBetween("yabcz", "y", "z")   = "abc"
* StringUtils.substringBetween("yabczyabcz", "y", "z")   = "abc"

46.substringsBetween()

描述：substringsBetween的功能为：根据传入的字符串open与字符串close来截取子字符串，返回
所有匹配到的子字符串，所以返回的对象时字符串数组。

* StringUtils.substringsBetween("[a][b][c]", "[", "]") = ["a","b","c"]
* StringUtils.substringsBetween(null, *, *)  = null
* StringUtils.substringsBetween(*, null, *)  = null
* StringUtils.substringsBetween(*, *, null)  = null
* StringUtils.substringsBetween("", "[", "]")= []

47.split()

描述：split的重载功能分别为：将字符空格作为分隔符，返回字符串str分隔后的字符串数组。将传入的字符separatorChar作为分隔符，返回字符串str分隔后的字符串数组。将传入的字符串separatorChars作为分隔符，返回字符串str分隔后的字符串数组。将传入的字符串separatorChars作为分隔符，返回字符串str分隔后长度不大于max的字符串数组，多余的部分不分割，并入最后一个元素。

* StringUtils.split(null)  = null
* StringUtils.split("")    = []
* StringUtils.split("abc def")  = ["abc", "def"]
* StringUtils.split("abc  def") = ["abc", "def"]
* StringUtils.split(" abc ")    = ["abc"]

* StringUtils.split(null, *)    = null
* StringUtils.split("", *) = []
* StringUtils.split("a.b.c", '.')    = ["a", "b", "c"]
* StringUtils.split("a..b.c", '.')   = ["a", "b", "c"]
* StringUtils.split("a:b:c", '.')    = ["a:b:c"]
* StringUtils.split("a b c", ' ')    = ["a", "b", "c"]

* StringUtils.split(null, *)    = null
* StringUtils.split("", *) = []
* StringUtils.split("abc def", null) = ["abc", "def"]
* StringUtils.split("abc def", " ")  = ["abc", "def"]
* StringUtils.split("abc  def", " ") = ["abc", "def"]
* StringUtils.split("ab:cd:ef", ":") = ["ab", "cd", "ef"]

* StringUtils.split(null, *, *)  = null
* StringUtils.split("", *, *)    = []
* StringUtils.split("ab cd ef", null, 0)   = ["ab", "cd", "ef"]
* StringUtils.split("ab   cd ef", null, 0) = ["ab", "cd", "ef"]
* StringUtils.split("ab:cd:ef", ":", 0)    = ["ab", "cd", "ef"]
* StringUtils.split("ab:cd:ef", ":", 2)    = ["ab", "cd:ef"]

48.splitByWholeSeparator()和splitByWholeSeparatorPreserveAllTokens()

描述：splitByWholeSeparator的重载功能分别为：将传入的字符串separator作为分隔符，返回字符串str分隔后的字符串数组。

* StringUtils.splitByWholeSeparator(null, *)= null
* StringUtils.splitByWholeSeparator("", *)  = []
* StringUtils.splitByWholeSeparator("ab de fg", null) = ["ab", "de", "fg"]
* StringUtils.splitByWholeSeparator("ab   de fg", null)    = ["ab", "de", "fg"]
* StringUtils.splitByWholeSeparator("ab:cd:ef", ":")  = ["ab", "cd", "ef"]
* StringUtils.splitByWholeSeparator("ab-!-cd-!-ef", "-!-") = ["ab", "cd", "ef"]

* StringUtils.splitByWholeSeparator(null, *, *)= null
* StringUtils.splitByWholeSeparator("", *, *)  = []
* StringUtils.splitByWholeSeparator("ab de fg", null, 0) = ["ab", "de", "fg"]
* StringUtils.splitByWholeSeparator("ab   de fg", null, 0)    = ["ab", "de", "fg"]
* StringUtils.splitByWholeSeparator("ab:cd:ef", ":", 2)  = ["ab", "cd:ef"]
* StringUtils.splitByWholeSeparator("ab-!-cd-!-ef", "-!-", 5) = ["ab", "cd", "ef"]
* StringUtils.splitByWholeSeparator("ab-!-cd-!-ef", "-!-", 2) = ["ab", "cd-!-ef"]
* StringUtils.splitByWholeSeparatorPreserveAllTokens(null, *)= null
* StringUtils.splitByWholeSeparatorPreserveAllTokens("", *)  = []
* StringUtils.splitByWholeSeparatorPreserveAllTokens("ab de fg", null) = ["ab", "de", "fg"]
* StringUtils.splitByWholeSeparatorPreserveAllTokens("ab   de fg", null)    = ["ab", "", "", "de", "fg"]
* StringUtils.splitByWholeSeparatorPreserveAllTokens("ab:cd:ef", ":")  = ["ab", "cd", "ef"]
* StringUtils.splitByWholeSeparatorPreserveAllTokens("ab-!-cd-!-ef", "-!-") = ["ab", "cd", "ef"]

* StringUtils.splitByWholeSeparatorPreserveAllTokens(null, *, *)= null
* StringUtils.splitByWholeSeparatorPreserveAllTokens("", *, *)  = []
* StringUtils.splitByWholeSeparatorPreserveAllTokens("ab de fg", null, 0) = ["ab", "de", "fg"]
* StringUtils.splitByWholeSeparatorPreserveAllTokens("ab   de fg", null, 0)    = ["ab", "", "", "de", "fg"]
* StringUtils.splitByWholeSeparatorPreserveAllTokens("ab:cd:ef", ":", 2)  = ["ab", "cd:ef"]
* StringUtils.splitByWholeSeparatorPreserveAllTokens("ab-!-cd-!-ef", "-!-", 5) = ["ab", "cd", "ef"]
* StringUtils.splitByWholeSeparatorPreserveAllTokens("ab-!-cd-!-ef", "-!-", 2) = ["ab", "cd-!-ef"]

49.splitPreserveAllTokens()

描述：splitPreserveAllTokens的四个重载功能分别为：
根据空格作为分隔符，将字符串str分隔为字符串数组，重复的分隔符是空串的分隔。
将传入的separatorChar作为分隔符，将字符串str分隔为字符串数组，重复的分隔符是空串的分隔。
将传入的separatorChars作为分隔符，将字符串str分隔为字符串数组，重复的分隔符是空串的分隔。
将传入的separatorChars作为分隔符，将字符串str分隔为字符串数组，数组大小不大于max，余下的并入最后一个数组元素，重复的分隔符是空串的分隔。

* StringUtils.splitPreserveAllTokens(null)  = null
* StringUtils.splitPreserveAllTokens("")    = []
* StringUtils.splitPreserveAllTokens("abc def")  = ["abc", "def"]
* StringUtils.splitPreserveAllTokens("abc  def") = ["abc", "", "def"]
* StringUtils.splitPreserveAllTokens(" abc ")    = ["", "abc", ""]

* StringUtils.splitPreserveAllTokens(null, *)    = null
* StringUtils.splitPreserveAllTokens("", *) = []
* StringUtils.splitPreserveAllTokens("a.b.c", '.')    = ["a", "b", "c"]
* StringUtils.splitPreserveAllTokens("a..b.c", '.')   = ["a", "", "b", "c"]
* StringUtils.splitPreserveAllTokens("a:b:c", '.')    = ["a:b:c"]
* StringUtils.splitPreserveAllTokens("a\tb\nc", null) = ["a", "b", "c"]
* StringUtils.splitPreserveAllTokens("a b c", ' ')    = ["a", "b", "c"]
* StringUtils.splitPreserveAllTokens("a b c ", ' ')   = ["a", "b", "c", ""]
* StringUtils.splitPreserveAllTokens("a b c  ", ' ')   = ["a", "b", "c", "", ""]
* StringUtils.splitPreserveAllTokens(" a b c", ' ')   = ["", a", "b", "c"]
* StringUtils.splitPreserveAllTokens("  a b c", ' ')  = ["", "", a", "b", "c"]
* StringUtils.splitPreserveAllTokens(" a b c ", ' ')  = ["", a", "b", "c", ""]

* StringUtils.splitPreserveAllTokens(null, *) = null
* StringUtils.splitPreserveAllTokens("", *)   = []
* StringUtils.splitPreserveAllTokens("abc def", null)   = ["abc", "def"]
* StringUtils.splitPreserveAllTokens("abc def", " ")    = ["abc", "def"]
* StringUtils.splitPreserveAllTokens("abc  def", " ")   = ["abc", "", def"]
* StringUtils.splitPreserveAllTokens("ab:cd:ef", ":")   = ["ab", "cd", "ef"]
* StringUtils.splitPreserveAllTokens("ab:cd:ef:", ":")  = ["ab", "cd", "ef", ""]
* StringUtils.splitPreserveAllTokens("ab:cd:ef::", ":") = ["ab", "cd", "ef", "", ""]
* StringUtils.splitPreserveAllTokens("ab::cd:ef", ":")  = ["ab", "", cd", "ef"]
* StringUtils.splitPreserveAllTokens(":cd:ef", ":")= ["", cd", "ef"]
* StringUtils.splitPreserveAllTokens("::cd:ef", ":")    = ["", "", cd", "ef"]
* StringUtils.splitPreserveAllTokens(":cd:ef:", ":")    = ["", cd", "ef", ""]

* StringUtils.splitPreserveAllTokens(null, *, *)  = null
* StringUtils.splitPreserveAllTokens("", *, *)    = []
* StringUtils.splitPreserveAllTokens("ab de fg", null, 0)   = ["ab", "cd", "ef"]
* StringUtils.splitPreserveAllTokens("ab   de fg", null, 0) = ["ab", "cd", "ef"]
* StringUtils.splitPreserveAllTokens("ab:cd:ef", ":", 0)    = ["ab", "cd", "ef"]
* StringUtils.splitPreserveAllTokens("ab:cd:ef", ":", 2)    = ["ab", "cd:ef"]
* StringUtils.splitPreserveAllTokens("ab   de fg", null, 2) = ["ab", "  de fg"]
* StringUtils.splitPreserveAllTokens("ab   de fg", null, 3) = ["ab", "", " de fg"]
* StringUtils.splitPreserveAllTokens("ab   de fg", null, 4) = ["ab", "", "", "de fg"]

50.splitByCharacterType()

描述：按照字符串类型来划分字符串str，并返回字符串数组。大小写、数字、特殊字符。

* StringUtils.splitByCharacterType(null)    = null
* StringUtils.splitByCharacterType("") = []
* StringUtils.splitByCharacterType("ab de fg")   = ["ab", " ", "de", " ", "fg"]
* StringUtils.splitByCharacterType("ab   de fg") = ["ab", "   ", "de", " ", "fg"]
* StringUtils.splitByCharacterType("ab:cd:ef")   = ["ab", ":", "cd", ":", "ef"]
* StringUtils.splitByCharacterType("number5")    = ["number", "5"]
* StringUtils.splitByCharacterType("fooBar")= ["foo", "B", "ar"]
* StringUtils.splitByCharacterType("foo200Bar")  = ["foo", "200", "B", "ar"]
* StringUtils.splitByCharacterType("ASFRules")   = ["ASFR", "ules"]

51.splitByCharacterTypeCamelCase()

描述：在splitByCharacterType的基础上，加入驼峰命名的规则来分隔字符串。（仅对大小写有影响）

* StringUtils.splitByCharacterTypeCamelCase(null)    = null
* StringUtils.splitByCharacterTypeCamelCase("") = []
* StringUtils.splitByCharacterTypeCamelCase("ab de fg")   = ["ab", " ", "de", " ", "fg"]
* StringUtils.splitByCharacterTypeCamelCase("ab   de fg") = ["ab", "   ", "de", " ", "fg"]
* StringUtils.splitByCharacterTypeCamelCase("ab:cd:ef")   = ["ab", ":", "cd", ":", "ef"]
* StringUtils.splitByCharacterTypeCamelCase("number5")    = ["number", "5"]
* StringUtils.splitByCharacterTypeCamelCase("fooBar")= ["foo", "Bar"]
* StringUtils.splitByCharacterTypeCamelCase("foo200Bar")  = ["foo", "200", "Bar"]
* StringUtils.splitByCharacterTypeCamelCase("ASFRules")   = ["ASF", "Rules"]

52.join()

描述1：将数组元素合并为一个字符串，元素之间没有分隔符。

* StringUtils.join(null)  = null
* StringUtils.join([])    = ""
* StringUtils.join([null])= ""
* StringUtils.join(["a", "b", "c"]) = "abc"
* StringUtils.join([null, "", "a"]) = "a"

描述2：根据传入参数类型的不同，将传入的数组合并为一个字符串，各元素间的分隔符按照传入的separator设定。

* StringUtils.join(null, *)= null
* StringUtils.join([], *)  = ""
* StringUtils.join([null], *)   = ""
* StringUtils.join(["a", "b", "c"], ';')  = "a;b;c"
* StringUtils.join(["a", "b", "c"], null) = "abc"
* StringUtils.join([null, "", "a"], ';')  = ";;a"

* StringUtils.join(null, *)= null
* StringUtils.join([], *)  = ""
* StringUtils.join([null], *)   = ""
* StringUtils.join([1, 2, 3], ';')  = "1;2;3"
* StringUtils.join([1, 2, 3], null) = "123"

描述3：根据传入参数类型的不同，将传入的数组按照传入的元素起始位置startIndex和结束位置endIndex合并为一个字符串，各元素间的分隔符按照传入的separator设定。

* StringUtils.join(null, *,2,4)= null
* StringUtils.join([], *,4,5)  = ""
* StringUtils.join([null], *，1,5)   = ""
* StringUtils.join(["a", "b", "c"，"d", "e"], ';',1,4)  = "b;c;d"
* StringUtils.join(["a", "b", "c"，"d", "e"], null,1,4) = "bcd"
* StringUtils.join([null, "", "a", "",null], ';',1,4)  = ";a;"

* StringUtils.join(null, *,2,4)= null
* StringUtils.join([], *,2,4)  = ""
* StringUtils.join([null], *,1,3)   = ""
* StringUtils.join([1, 2, 3, 4, 5], ';',1,5)  = "2;3;4;5"
* StringUtils.join([1, 2, 3, 4, 5], null,1,5) = "2345"

描述4：根据传入的分隔字符串separator，将数组合并为字符串，各数组元素间用separator隔开。

* StringUtils.join(null, *) = null
* StringUtils.join([], *)   = ""
* StringUtils.join([null], *)    = ""
* StringUtils.join(["a", "b", "c"], "--")  = "a--b--c"
* StringUtils.join(["a", "b", "c"], null)  = "abc"
* StringUtils.join(["a", "b", "c"], "")    = "abc"
* StringUtils.join([null, "", "a"], ',')   = ",,a"

描述5：根据传入的分隔字符串separator，将数组开始位置startIndex与结位置endIndex间的元素，合并为字符串，各数组元素间用separator隔开。

* StringUtils.join(null, *, *, *) = null
* StringUtils.join([], *, *, *)   = ""
* StringUtils.join([null], *, *, *)    = ""
* StringUtils.join(["a", "b", "c"], "--", 0, 3)  = "a--b--c"
* StringUtils.join(["a", "b", "c"], "--", 1, 3)  = "b--c"
* StringUtils.join(["a", "b", "c"], "--", 2, 3)  = "c"
* StringUtils.join(["a", "b", "c"], "--", 2, 2)  = ""
* StringUtils.join(["a", "b", "c"], null, 0, 3)  = "abc"
* StringUtils.join(["a", "b", "c"], "", 0, 3)    = "abc"
* StringUtils.join([null, "", "a"], ',', 0, 3)   = ",,a"

53.deleteWhitespace()

描述：删除字符串中的所有空白符，返回新字符串。

* StringUtils.deleteWhitespace(null)    = null
* StringUtils.deleteWhitespace("") = ""
* StringUtils.deleteWhitespace("abc")   = "abc"
* StringUtils.deleteWhitespace("   ab  c  ") = "abc"

54.removeStart()

描述：仅当字符串remove位于str开头时才删除remove，返回删除后的str，否则返回原串。

* StringUtils.removeStart(null, *) = null
* StringUtils.removeStart("", *)   = ""
* StringUtils.removeStart(*, null) = *
* StringUtils.removeStart("www.domain.com", "www.")   = "domain.com"
* StringUtils.removeStart("domain.com", "www.")  = "domain.com"
* StringUtils.removeStart("www.domain.com", "domain") = "www.domain.com"
* StringUtils.removeStart("abc", "")    = "abc"

55.removeStartIgnoreCase()

描述：在区分大小写 的情况下，仅当字符串remove位于str开头时才删除remove，返回删除后的str，否则返回原串。

* StringUtils.removeStartIgnoreCase(null, *) = null
* StringUtils.removeStartIgnoreCase("", *)   = ""
* StringUtils.removeStartIgnoreCase(*, null) = *
* StringUtils.removeStartIgnoreCase("www.domain.com", "www.")   = "domain.com"
* StringUtils.removeStartIgnoreCase("www.domain.com", "WWW.")   = "domain.com"
* StringUtils.removeStartIgnoreCase("domain.com", "www.")  = "domain.com"
* StringUtils.removeStartIgnoreCase("www.domain.com", "domain") = "www.domain.com"
* StringUtils.removeStartIgnoreCase("abc", "")    = "ab

56.removeEnd()

描述：仅当字符串remove位于str结尾时才删除remove，返回删除后的str，否则返回原串。

* StringUtils.removeEnd(null, *) = null
* StringUtils.removeEnd("", *)   = ""
* StringUtils.removeEnd(*, null) = *
* StringUtils.removeEnd("www.domain.com", ".com.")  = "www.domain.com"
* StringUtils.removeEnd("www.domain.com", ".com")   = "www.domain"
* StringUtils.removeEnd("www.domain.com", "domain") = "www.domain.com"
* StringUtils.removeEnd("abc", "")    = "abc"

57.removeEndIgnoreCase()

描述：在区分大小写 的情况下，仅当字符串remove位于str结尾时才删除remove，返回删除后的str，否则返回原串。

* StringUtils.removeEndIgnoreCase(null, *) = null
* StringUtils.removeEndIgnoreCase("", *)   = ""
* StringUtils.removeEndIgnoreCase(*, null) = *
* StringUtils.removeEndIgnoreCase("www.domain.com", ".com.")  = "www.domain.com"
* StringUtils.removeEndIgnoreCase("www.domain.com", ".com")   = "www.domain"
* StringUtils.removeEndIgnoreCase("www.domain.com", "domain") = "www.domain.com"
* StringUtils.removeEndIgnoreCase("abc", "")    = "abc"
* StringUtils.removeEndIgnoreCase("www.domain.com", ".COM") = "www.domain")
* StringUtils.removeEndIgnoreCase("www.domain.COM", ".com") = "www.domain")

58.remove

描述1：删除字符串str中所有的remove子串，返回新串。

* StringUtils.remove(null, *)   = null
* StringUtils.remove("", *)= ""
* StringUtils.remove(*, null)   = *
* StringUtils.remove(*, "")= *
* StringUtils.remove("queued", "ue") = "qd"
* StringUtils.remove("queued", "zz") = "queued"

描述2：删除字符串str中所有的remove字符，返回新串。

* StringUtils.remove(null, *)  = null
* StringUtils.remove("", *)    = ""
* StringUtils.remove("queued", 'u') = "qeed"
* StringUtils.remove("queued", 'z') = "queued"

59.replaceOnce()

描述：将字符串text中第一个匹配的searchString替换为replacement。

* StringUtils.replaceOnce(null, *, *)   = null
* StringUtils.replaceOnce("", *, *)= ""
* StringUtils.replaceOnce("any", null, *)    = "any"
* StringUtils.replaceOnce("any", *, null)    = "any"
* StringUtils.replaceOnce("any", "", *) = "any"
* StringUtils.replaceOnce("aba", "a", null)  = "aba"
* StringUtils.replaceOnce("aba", "a", "")    = "ba"
* StringUtils.replaceOnce("aba", "a", "z")   = "zba"

60.replacePattern()

描述：在字符串source中，将每个匹配正则表达式regex的子字符串替换为字符串replacement。

61.removePattern()

描述：依赖replacePattern实现，将source中每个匹配的regex子串替换为空串，效果相当于删除，返回新串。

62.replace()

描述1：在字符串text中，替换所有searchString字符串为replacement字符串。

* StringUtils.replace(null, *, *)   = null
* StringUtils.replace("", *, *)= ""
* StringUtils.replace("any", null, *)    = "any"
* StringUtils.replace("any", *, null)    = "any"
* StringUtils.replace("any", "", *) = "any"
* StringUtils.replace("aba", "a", null)  = "aba"
* StringUtils.replace("aba", "a", "")    = "b"
* StringUtils.replace("aba", "a", "z")   = "zbz"

描述2：在字符串text中，替换searchString字符串为replacement字符串，最多替换max个。

* StringUtils.replace(null, *, *, *)    = null
* StringUtils.replace("", *, *, *) = ""
* StringUtils.replace("any", null, *, *)= "any"
* StringUtils.replace("any", *, null, *)= "any"
* StringUtils.replace("any", "", *, *)  = "any"
* StringUtils.replace("any", *, *, 0)   = "any"
* StringUtils.replace("abaa", "a", null, -1) = "abaa"
* StringUtils.replace("abaa", "a", "", -1)   = "b"
* StringUtils.replace("abaa", "a", "z", 0)   = "abaa"
* StringUtils.replace("abaa", "a", "z", 1)   = "zbaa"
* StringUtils.replace("abaa", "a", "z", 2)   = "zbza"
* StringUtils.replace("abaa", "a", "z", -1)  = "zbzz"

63.replaceEach()

描述：在字符串text中，将所有的searchList字符串数组元素与replacement字符串数组元素一次性一一对应替换。（即所有元素同时替换）

*  StringUtils.replaceEach(null, *, *)   = null
*  StringUtils.replaceEach("", *, *)= ""
*  StringUtils.replaceEach("aba", null, null) = "aba"
*  StringUtils.replaceEach("aba", new String[0], null) = "aba"
*  StringUtils.replaceEach("aba", null, new String[0]) = "aba"
*  StringUtils.replaceEach("aba", new String[]{"a"}, null)  = "aba"
*  StringUtils.replaceEach("aba", new String[]{"a"}, new String[]{""})  = "b"
*  StringUtils.replaceEach("aba", new String[]{null}, new String[]{"a"})  = "aba"
*  StringUtils.replaceEach("abcde", new String[]{"ab", "d"}, new String[]{"w", "t"})  = "wcte"
*  (example of how it does not repeat)
*  StringUtils.replaceEach("abcde", new String[]{"ab", "d"}, new String[]{"d", "t"})  = "dcte"

64.replaceEachRepeatedly()

描述：在字符串text中，将所有的searchList字符串数组元素与replacement字符串数组元素串行一一对应替换。（即按每个元素替换后的结果作为下个元素替换的原串）

*  StringUtils.replaceEach(null, *, *, *) = null
*  StringUtils.replaceEach("", *, *, *) = ""
*  StringUtils.replaceEach("aba", null, null, *) = "aba"
*  StringUtils.replaceEach("aba", new String[0], null, *) = "aba"
*  StringUtils.replaceEach("aba", null, new String[0], *) = "aba"
*  StringUtils.replaceEach("aba", new String[]{"a"}, null, *) = "aba"
*  StringUtils.replaceEach("aba", new String[]{"a"}, new String[]{""}, *) = "b"
*  StringUtils.replaceEach("aba", new String[]{null}, new String[]{"a"}, *) = "aba"
*  StringUtils.replaceEach("abcde", new String[]{"ab", "d"}, new String[]{"w", "t"}, *) = "wcte"
*  (example of how it repeats)
*  StringUtils.replaceEach("abcde", new String[]{"ab", "d"}, new String[]{"d", "t"}, false) = "dcte"
*  StringUtils.replaceEach("abcde", new String[]{"ab", "d"}, new String[]{"d", "t"}, true) = "tcte"
*  StringUtils.replaceEach("abcde", new String[]{"ab", "d"}, new String[]{"d", "ab"}, true) = IllegalStateException
*  StringUtils.replaceEach("abcde", new String[]{"ab", "d"}, new String[]{"d", "ab"}, false) = "dcabe"

65.replaceChars()

描述1：在str中匹配字符searchChar,并以字符replaceChar替代。

* StringUtils.replaceChars(null, *, *)   = null
* StringUtils.replaceChars("", *, *)= ""
* StringUtils.replaceChars("abcba", 'b', 'y') = "aycya"
* StringUtils.replaceChars("abcba", 'z', 'y') = "abcba"

描述2：一次替换字符串中的多个字符。此方法也可用于删除字符。拿searchChars的index，去replaceChars找相应的index然后替换掉。

* StringUtils.replaceChars(null, *, *) = null
* StringUtils.replaceChars("", *, *)   = ""
* StringUtils.replaceChars("abc", null, *)  = "abc"
* StringUtils.replaceChars("abc", "", *)    = "abc"
* StringUtils.replaceChars("abc", "b", null)= "ac"
* StringUtils.replaceChars("abc", "b", "")  = "ac"
* StringUtils.replaceChars("abcba", "bc", "yz")  = "ayzya"
* StringUtils.replaceChars("abcba", "bc", "y")   = "ayya"
* StringUtils.replaceChars("abcba", "bc", "yzx") = "ayzya"

66.overlay()

描述：根据start和end将str字符串中相应位置的字符串（可以是空串），替换为overlay

* StringUtils.overlay(null, *, *, *)  = null
* StringUtils.overlay("", "abc", 0, 0)= "abc"
* StringUtils.overlay("abcdef", null, 2, 4)= "abef"
* StringUtils.overlay("abcdef", "", 2, 4)  = "abef"
* StringUtils.overlay("abcdef", "", 4, 2)  = "abef"
* StringUtils.overlay("abcdef", "zzzz", 2, 4)   = "abzzzzef"
* StringUtils.overlay("abcdef", "zzzz", 4, 2)   = "abzzzzef"
* StringUtils.overlay("abcdef", "zzzz", -1, 4)  = "zzzzef"
* StringUtils.overlay("abcdef", "zzzz", 2, 8)   = "abzzzz"
* StringUtils.overlay("abcdef", "zzzz", -2, -3) = "zzzzabcdef"
* StringUtils.overlay("abcdef", "zzzz", 8, 10)  = "abcdefzzzz"

67.chomp()

描述：将字符串str结尾的’\r’ ‘\n’ ‘\r\n’ 中的一种删除（优先删除’\r\n’）。

* StringUtils.chomp(null)= null
* StringUtils.chomp("")  = ""
* StringUtils.chomp("abc \r") = "abc "
* StringUtils.chomp("abc\n")  = "abc"
* StringUtils.chomp("abc\r\n")= "abc"
* StringUtils.chomp("abc\r\n\r\n") = "abc\r\n"
* StringUtils.chomp("abc\n\r")= "abc\n"
* StringUtils.chomp("abc\n\rabc")  = "abc\n\rabc"
* StringUtils.chomp("\r")= ""
* StringUtils.chomp("\n")= ""
* StringUtils.chomp("\r\n")   = ""

68.chop()

描述：删除字符串str的最后一个字符，’\r\n’算一个字符。

* StringUtils.chop(null)= null
* StringUtils.chop("")  = ""
* StringUtils.chop("abc \r") = "abc "
* StringUtils.chop("abc\n")  = "abc"
* StringUtils.chop("abc\r\n")= "abc"
* StringUtils.chop("abc")    = "ab"
* StringUtils.chop("abc\nabc")    = "abc\nab"
* StringUtils.chop("a") = ""
* StringUtils.chop("\r")= ""
* StringUtils.chop("\n")= ""
* StringUtils.chop("\r\n")   = ""

69.repeat()

描述1：重复字符串str，次数为repeat次。

* StringUtils.repeat(null, 2) = null
* StringUtils.repeat("", 0)   = ""
* StringUtils.repeat("", 2)   = ""
* StringUtils.repeat("a", 3)  = "aaa"
* StringUtils.repeat("ab", 2) = "abab"
* StringUtils.repeat("a", -2) = ""

描述2：重复字符串str，次数为repeat次，分隔符为separator。

* StringUtils.repeat(null, null, 2) = null
* StringUtils.repeat(null, "x", 2)  = null
* StringUtils.repeat("", null, 0)   = ""
* StringUtils.repeat("", "", 2)= ""
* StringUtils.repeat("", "x", 3)    = "xxx"
* StringUtils.repeat("?", ", ", 3)  = "?, ?, ?"

描述3：重复字符ch，次数为repeat次。

* StringUtils.repeat('e', 0)  = ""
* StringUtils.repeat('e', 3)  = "eee"
* StringUtils.repeat('e', -2) = ""

70.rightPad()

描述1：若str长度不足size，则使用空格在字符串后补全。

* StringUtils.rightPad(null, *)   = null
* StringUtils.rightPad("", 3)= "   "
* StringUtils.rightPad("bat", 3)  = "bat"
* StringUtils.rightPad("bat", 5)  = "bat  "
* StringUtils.rightPad("bat", 1)  = "bat"
* StringUtils.rightPad("bat", -1) = "bat"

描述2：若str长度不足size，则使用padChar字符在字符串后补全。

* StringUtils.rightPad(null, *, *)= null
* StringUtils.rightPad("", 3, 'z')= "zzz"
* StringUtils.rightPad("bat", 3, 'z')  = "bat"
* StringUtils.rightPad("bat", 5, 'z')  = "batzz"
* StringUtils.rightPad("bat", 1, 'z')  = "bat"
* StringUtils.rightPad("bat", -1, 'z') = "bat"

描述3：若str长度不足size，则使用padStr字符串在字符串后补全，padStr可以截断。

* StringUtils.rightPad(null, *, *) = null
* StringUtils.rightPad("", 3, "z") = "zzz"
* StringUtils.rightPad("bat", 3, "yz")  = "bat"
* StringUtils.rightPad("bat", 5, "yz")  = "batyz"
* StringUtils.rightPad("bat", 8, "yz")  = "batyzyzy"
* StringUtils.rightPad("bat", 1, "yz")  = "bat"
* StringUtils.rightPad("bat", -1, "yz") = "bat"
* StringUtils.rightPad("bat", 5, null)  = "bat  "
* StringUtils.rightPad("bat", 5, "")    = "bat  "

71.leftPad()

描述：与right对应，在字符串前补全。

* StringUtils.leftPad(null, *)   = null
* StringUtils.leftPad("", 3)= "   "
* StringUtils.leftPad("bat", 3)  = "bat"
* StringUtils.leftPad("bat", 5)  = "  bat"
* StringUtils.leftPad("bat", 1)  = "bat"
* StringUtils.leftPad("bat", -1) = "bat"

* StringUtils.leftPad(null, *, *)= null
* StringUtils.leftPad("", 3, 'z')= "zzz"
* StringUtils.leftPad("bat", 3, 'z')  = "bat"
* StringUtils.leftPad("bat", 5, 'z')  = "zzbat"
* StringUtils.leftPad("bat", 1, 'z')  = "bat"
* StringUtils.leftPad("bat", -1, 'z') = "bat"

* StringUtils.leftPad(null, *, *) = null
* StringUtils.leftPad("", 3, "z") = "zzz"
* StringUtils.leftPad("bat", 3, "yz")  = "bat"
* StringUtils.leftPad("bat", 5, "yz")  = "yzbat"
* StringUtils.leftPad("bat", 8, "yz")  = "yzyzybat"
* StringUtils.leftPad("bat", 1, "yz")  = "bat"
* StringUtils.leftPad("bat", -1, "yz") = "bat"
* StringUtils.leftPad("bat", 5, null)  = "  bat"
* StringUtils.leftPad("bat", 5, "")    = "  bat"

72.center()

描述1：返回一个字符串，长度为size，str位于新串中心，空格补齐。

* StringUtils.center(null, *)   = null
* StringUtils.center("", 4)= "    "
* StringUtils.center("ab", -1)  = "ab"
* StringUtils.center("ab", 4)   = " ab "
* StringUtils.center("abcd", 2) = "abcd"
* StringUtils.center("a", 4)    = " a  "

描述2：返回一个字符串，长度为size，str位于新串中心，padChar补齐。

* StringUtils.center(null, *, *)= null
* StringUtils.center("", 4, ' ')= "    "
* StringUtils.center("ab", -1, ' ')  = "ab"
* StringUtils.center("ab", 4, ' ')   = " ab "
* StringUtils.center("abcd", 2, ' ') = "abcd"
* StringUtils.center("a", 4, ' ')    = " a  "
* StringUtils.center("a", 4, 'y')    = "yayy"

描述3：返回一个字符串，长度为size，str位于新串中心，padStr补齐，padStr可拆分。

* StringUtils.center(null, *, *)= null
* StringUtils.center("", 4, " ")= "    "
* StringUtils.center("ab", -1, " ")  = "ab"
* StringUtils.center("ab", 4, " ")   = " ab "
* StringUtils.center("abcd", 2, " ") = "abcd"
* StringUtils.center("a", 4, " ")    = " a  "
* StringUtils.center("a", 4, "yz")   = "yayz"
* StringUtils.center("abc", 7, null) = "  abc  "
* StringUtils.center("abc", 7, "")   = "  abc  "

73.upperCase()

描述：将字符串转化为大写。

* StringUtils.upperCase(null)  = null
* StringUtils.upperCase("")    = ""
* StringUtils.upperCase("aBc") = "ABC"

74.lowerCase()

描述：将字符串转化为小写。

* StringUtils.lowerCase(null)  = null
* StringUtils.lowerCase("")    = ""
* StringUtils.lowerCase("aBc") = "abc"

75.capitalize()

描述：将字符串首字符转化为大写。

* StringUtils.capitalize(null)  = null
* StringUtils.capitalize("")    = ""
* StringUtils.capitalize("cat") = "Cat"
* StringUtils.capitalize("cAt") = "CAt"

76.uncapitalize()

描述：将字符串首字符转化为小写。

* StringUtils.uncapitalize(null)  = null
* StringUtils.uncapitalize("")    = ""
* StringUtils.uncapitalize("Cat") = "cat"
* StringUtils.uncapitalize("CAT") = "cAT"

77.swapCase()

描述：字符串大写转小写，小写转大写。

* StringUtils.swapCase(null)  = null
* StringUtils.swapCase("")    = ""
* StringUtils.swapCase("The dog has a BONE") = "tHE DOG HAS A bone"

78.countMatches()

描述：计算字符序列str中字符序列sub的数量。

* StringUtils.countMatches("", *)    = 0
* StringUtils.countMatches("abba", null)  = 0
* StringUtils.countMatches("abba", "")    = 0
* StringUtils.countMatches("abba", "a")   = 2
* StringUtils.countMatches("abba", "ab")  = 1
* StringUtils.countMatches("abba", "xxx") = 0

79.reverse()

描述：反转字符串。

* StringUtils.reverse(null)  = null
* StringUtils.reverse("")    = ""
* StringUtils.reverse("bat") = "tab"

80.reverseDelimited()

描述：反转由特定字符分隔的字符串。

* StringUtils.reverseDelimited(null, *) = null
* StringUtils.reverseDelimited("", *)   = ""
* StringUtils.reverseDelimited("a.b.c", 'x') = "a.b.c"
* StringUtils.reverseDelimited("a.b.c", ".") = "c.b.a"

81.difference()

描述：返回str2跟str1比较特有的部分。

* StringUtils.difference(null, null) = null
* StringUtils.difference("", "") = ""
* StringUtils.difference("", "abc") = "abc"
* StringUtils.difference("abc", "") = ""
* StringUtils.difference("abc", "abc") = ""
* StringUtils.difference("abc", "ab") = ""
* StringUtils.difference("ab", "abxyz") = "xyz"
* StringUtils.difference("abcde", "abxyz") = "xyz"
* StringUtils.difference("abcde", "xyz") = "xyz"

82.indexOfDifference()

描述1：返回两个字符序列cs1、cs2开始不同的位置。

* StringUtils.indexOfDifference(null, null) = -1
* StringUtils.indexOfDifference("", "") = -1
* StringUtils.indexOfDifference("", "abc") = 0
* StringUtils.indexOfDifference("abc", "") = 0
* StringUtils.indexOfDifference("abc", "abc") = -1
* StringUtils.indexOfDifference("ab", "abxyz") = 2
* StringUtils.indexOfDifference("abcde", "abxyz") = 2
* StringUtils.indexOfDifference("abcde", "xyz") = 0

描述2：比较数组中所有的字符序列，并返回开始不同的位置。

* StringUtils.indexOfDifference(null) = -1
* StringUtils.indexOfDifference(new String[] {}) = -1
* StringUtils.indexOfDifference(new String[] {"abc"}) = -1
* StringUtils.indexOfDifference(new String[] {null, null}) = -1
* StringUtils.indexOfDifference(new String[] {"", ""}) = -1
* StringUtils.indexOfDifference(new String[] {"", null}) = 0
* StringUtils.indexOfDifference(new String[] {"abc", null, null}) = 0
* StringUtils.indexOfDifference(new String[] {null, null, "abc"}) = 0
* StringUtils.indexOfDifference(new String[] {"", "abc"}) = 0
* StringUtils.indexOfDifference(new String[] {"abc", ""}) = 0
* StringUtils.indexOfDifference(new String[] {"abc", "abc"}) = -1
* StringUtils.indexOfDifference(new String[] {"abc", "a"}) = 1
* StringUtils.indexOfDifference(new String[] {"ab", "abxyz"}) = 2
* StringUtils.indexOfDifference(new String[] {"abcde", "abxyz"}) = 2
* StringUtils.indexOfDifference(new String[] {"abcde", "xyz"}) = 0
* StringUtils.indexOfDifference(new String[] {"xyz", "abcde"}) = 0
* StringUtils.indexOfDifference(new String[] {"i am a machine", "i am a robot"}) = 7

83.toEncodedString()

描述：使用指定的编码，将字节数组转化为字符串。

本文地址：https://blog.csdn.net/qq_39150049/article/details/111957590

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