StringUtils处理字符串类

public class StringUtils

extends Object

Operations on String that are null safe. 字符串是null安全的，不会抛出NullPointerException，都做了相应的处理。

IsEmpty/IsBlank - checks if a String contains text
IsEmpty/IsBlank – 检查字符串是否有内容。
Trim/Strip - removes leading and trailing whitespace
Trim/Strip – 删除字符串开始和结尾的空白符。
Equals - compares two strings null-safe
Equals – 比较两个字符串null安全。
IndexOf/LastIndexOf/Contains - null-safe index-of checks
IndexOf/LastIndexOf/Contains – null安全的索引检查。
IndexOfAny/LastIndexOfAny/IndexOfAnyBut/LastIndexOfAnyBut - index-of any of a set of Strings
IndexOfAny/LastIndexOfAny/IndexOfAnyBut/LastIndexOfAnyBut – 字符串集合索引检查。
ContainsOnly/ContainsNone - does String contains only/none of these characters
ContainsOnly/ContainsNone – 字符在字符串中出现一次或一次也没有出现。
Substring/Left/Right/Mid - null-safe substring extractions
Substring/Left/Right/Mid – null安全子串的提取。
SubstringBefore/SubstringAfter/SubstringBetween - substring extraction relative to other strings
SubstringBefore/SubstringAfter/SubstringBetween – 子串提取依赖其它字符串。
Split/Join - splits a String into an array of substrings and vice versa
Split/Join – 字符串拆分为子串的字符串数组，反之亦然。
Remove/Delete - removes part of a String
Remove/Delete – 删除部分字符串。
Replace/Overlay - Searches a String and replaces one String with another
Replace/Overlay – 替换字符串的部分字符。
Chomp/Chop - removes the last part of a String
Chomp/Chop – 删除字符串最后的字符。
LeftPad/RightPad/Center/Repeat - pads a String
LeftPad/RightPad/Center/Repeat – 补字符串。
UpperCase/LowerCase/SwapCase/Capitalize/Uncapitalize - changes the case of a String
UpperCase/LowerCase/SwapCase/Capitalize/Uncapitalize – 改变字符串的大小写。
CountMatches - counts the number of occurrences of one String in another
CountMatches – 计算一个字符或字符串在另外一个字符串出现的次数。
IsAlpha/IsNumeric/IsWhitespace/IsAsciiPrintable - checks the characters in a String
IsAlpha/IsNumeric/IsWhitespace/IsAsciiPrintable – 判断字符是否在字符串中。
DefaultString - protects against a null input String
DefaultString –null安全，null转换为字符串。
Reverse/ReverseDelimited - reverses a String
Reverse/ReverseDelimited – 反转字符串。
Abbreviate - abbreviates a string using ellipsis
Abbreviate – 缩写字符串用省略符。
Difference - compares two Strings and reports on their differences
Difference – 比较两个字符串并且返回不同。
LevensteinDistance - the number of changes needed to change one String into another
LevensteinDistance – 一个字符串改变为另一个字符串需要改变的数量

。
The StringUtils class defines certain words related to String handling.

StringUtils类是对字符串的处理。

null – null 空
empty - a zero-length string ("") 长度为0的字符串
space - the space character (' ', char 32) 间隔符
whitespace - the characters defined by Character.isWhitespace(char) 空格符
trim - the characters <= 32 as in String.trim()去掉字符串两边字符<=32
Version:

$Id: StringUtils.java 492377 2007-01-04 01:20:30Z scolebourne $