com.alibaba.nacos.api.utils

类 StringUtils

java.lang.Object

com.alibaba.nacos.api.utils.StringUtils

public class StringUtils
extends Object

StringUtils. copy from apache common-lang3.

作者:

lin-mt

字段概要

字段

限定符和类型	字段和说明
static String	EMPTY The empty String "".

构造器概要

构造器

构造器和说明
StringUtils()

方法概要

限定符和类型	方法和说明
static boolean	equals(CharSequence cs1, CharSequence cs2) Compares two CharSequences, returning true if they represent equal sequences of characters.
static boolean	isBlank(CharSequence cs) Checks if a CharSequence is whitespace, empty ("") or null.
static boolean	isEmpty(CharSequence cs) Checks if a CharSequence is empty ("") or null.
static boolean	regionMatches(CharSequence cs, boolean ignoreCase, int thisStart, CharSequence substring, int start, int length) Green implementation of regionMatches.
static String	trim(String str) Removes control characters (char <= 32) from both ends of this String, handling null by returning null.

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

字段详细资料

EMPTY

public static final String EMPTY

The empty String "".

从以下版本开始:

2.0

另请参阅:

常量字段值

构造器详细资料

StringUtils

public StringUtils()

方法详细资料

isEmpty

public static boolean isEmpty(CharSequence cs)

Checks if a CharSequence is empty ("") or null.

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

NOTE: This method changed in Lang version 2.0. It no longer trims the CharSequence. That functionality is available in isBlank().

参数:

cs - the CharSequence to check, may be null

返回:

true if the CharSequence is empty or null

从以下版本开始:

3.0 Changed signature from isEmpty(String) to isEmpty(CharSequence)

isBlank

public static boolean isBlank(CharSequence cs)

Checks if a CharSequence is whitespace, empty ("") or null.

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

参数:

cs - the CharSequence to check, may be null

返回:

true if the CharSequence is null, empty or whitespace

从以下版本开始:

2.0, 3.0 Changed signature from isBlank(String) to isBlank(CharSequence)

trim

public static String trim(String str)

Removes control characters (char <= 32) from both ends of this String, handling null by returning null.

The String is trimmed using String.trim(). Trim removes start and end characters <= 32.

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

参数:

str - the String to be trimmed, may be null

返回:

the trimmed string, null if null String input

equals

public static boolean equals(CharSequence cs1,
                             CharSequence cs2)

Compares two CharSequences, returning true if they represent equal sequences of characters.

nulls are handled without exceptions. Two null references are considered to be equal. The comparison is case sensitive.

 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
 

参数:

cs1 - the first CharSequence, may be null

cs2 - the second CharSequence, may be null

返回:

true if the CharSequences are equal (case-sensitive), or both null

从以下版本开始:

3.0 Changed signature from equals(String, String) to equals(CharSequence, CharSequence)

另请参阅:

Object.equals(Object)

regionMatches

public static boolean regionMatches(CharSequence cs,
                                    boolean ignoreCase,
                                    int thisStart,
                                    CharSequence substring,
                                    int start,
                                    int length)

Green implementation of regionMatches.

参数:

cs - the CharSequence to be processed

ignoreCase - whether or not to be case insensitive

thisStart - the index to start on the cs CharSequence

substring - the CharSequence to be looked for

start - the index to start on the substring CharSequence

length - character length of the region

返回:

whether the region matched