com.taobao.config.client.utils

类 StringUtils

java.lang.Object

com.taobao.config.client.utils.StringUtils

public class StringUtils
extends Object

作者:

caogu.wyp

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(String str1, String str2)
static int	getNumber(String text)
static boolean	isBlank(String str)
static boolean	isEmpty(String str) Checks if a String is empty ("") or null.
static boolean	isExistBlank(String... strs)
static boolean	isNotBlank(String str)
static boolean	isNotEmpty(String str) Checks if a String is not empty ("") and not null.
static boolean	isNumeric(String str) Checks if the String contains only unicode digits.
static String	join(Object[] array, char separator)
static String	join(Object[] array, char separator, int startIndex, int endIndex) Joins the elements of the provided array into a single String containing the provided list of elements.
static void	main(String[] args)
static String	substringBetween(String str, String open, String close)

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

isBlank

public static boolean isBlank(String str)

isExistBlank

public static boolean isExistBlank(String... strs)

equals

public static boolean equals(String str1,
                             String str2)

substringBetween

public static String substringBetween(String str,
                                      String open,
                                      String close)

isNumeric

public static boolean isNumeric(String str)

Checks if the String contains only unicode digits. A decimal point is not a unicode digit and returns false.

null will return false. An empty String ("") will return true.

 StringUtils.isNumeric(null)   = false
 StringUtils.isNumeric("")     = true
 StringUtils.isNumeric("  ")   = false
 StringUtils.isNumeric("123")  = true
 StringUtils.isNumeric("12 3") = false
 StringUtils.isNumeric("ab2c") = false
 StringUtils.isNumeric("12-3") = false
 StringUtils.isNumeric("12.3") = false
 

参数:

str - the String to check, may be null

返回:

true if only contains digits, and is non-null

getNumber

public static int getNumber(String text)
                     throws NumberFormatException

抛出:

NumberFormatException

isEmpty

public static boolean isEmpty(String str)

Checks if a String 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 String. That functionality is available in isBlank().

参数:

str - the String to check, may be null

返回:

true if the String is empty or null

isNotEmpty

public static boolean isNotEmpty(String str)

Checks if a String is not empty ("") and not null.

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

参数:

str - the String to check, may be null

返回:

true if the String is not empty and not null

isNotBlank

public static boolean isNotBlank(String str)

join

public static String join(Object[] array,
                          char separator)

join

public static String join(Object[] array,
                          char separator,
                          int startIndex,
                          int endIndex)

Joins the elements of the provided array into a single String containing the provided list of elements.

No delimiter is added before or after the list. Null objects or empty strings within the array are represented by empty strings.

 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"
 

参数:

array - the array of values to join together, may be null

separator - the separator character to use

startIndex - the first index to start joining from. It is an error to pass in an end index past the end of the array

endIndex - the index to stop joining from (exclusive). It is an error to pass in an end index past the end of the array

返回:

the joined String, null if null array input

从以下版本开始:

2.0

main

public static void main(String[] args)