cn.crane4j.core.util

类 StringUtils

java.lang.Object

cn.crane4j.core.util.StringUtils

public class StringUtils
extends Object

CharSequence or String utils.

作者:

huangchengxing

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	contains(CharSequence str, CharSequence searchStr) Whether the searchStr is in the str.
static String	emptyToDefault(String str, String defaultStr) return the str if str is not empty, otherwise return defaultStr.
static String	emptyToNull(String str) return the str if str is not empty, otherwise return null.
static String	format(String template, Object... args) Format string with placeholder {}.
static boolean	isBlank(CharSequence cs) Whether the given CharSequence is blank.
static boolean	isEmpty(CharSequence cs) Whether the given CharSequence is empty.
static boolean	isNotBlank(CharSequence cs) Whether the given CharSequence is not blank.
static boolean	isNotEmpty(CharSequence cs) Whether the given CharSequence is not empty.
static <T> String	join(Collection<T> coll, Function<T,CharSequence> mapper, String separator) Join the coll with separator.
static <T> String	join(Function<T,CharSequence> mapper, String separator, T... array) Join the array with separator.
static String	md5DigestAsHex(String str) Md5 digest as hex.
static Collection<String>	split(String str, String splitter) Split string by given splitter.
static String	upperFirst(String str) Make the first character uppercase.
static String	upperFirstAndAddPrefix(String str, String prefix) Make the first character uppercase and add prefix.

从类继承的方法 java.lang.Object

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

构造器详细资料

StringUtils

public StringUtils()

方法详细资料

join

@SafeVarargs
public static <T> String join(Function<T,CharSequence> mapper,
                                            String separator,
                                            T... array)

Join the array with separator.

参数:

mapper - mapper

separator - separator

array - array

返回:

joined string

join

public static <T> String join(Collection<T> coll,
                              Function<T,CharSequence> mapper,
                              String separator)

Join the coll with separator.

参数:

coll - collection

mapper - mapper

separator - separator

返回:

joined string

contains

public static boolean contains(CharSequence str,
                               CharSequence searchStr)

Whether the searchStr is in the str.
eg:

• "abc", "abc" will return true
• "abc", "b" will return true
• "abc", "d" will return false
• null, "a" will return false
• "a", null will return false
• null, null will return false

参数:

str - the CharSequence to check, may be null

searchStr - the CharSequence to find, may be null

返回:

true if the search CharSequence is in the CharSequence

format

public static String format(String template,
                            Object... args)

Format string with placeholder {}.
eg: "a{}c", "b" will return "abc"

参数:

template - template

args - args

返回:

formatted string

isEmpty

public static boolean isEmpty(CharSequence cs)

Whether the given CharSequence is empty.
eg: null, "" will return true, "a", " " will return false.

参数:

cs - char sequence

返回:

is empty

isNotEmpty

public static boolean isNotEmpty(CharSequence cs)

Whether the given CharSequence is not empty. eg: null, "" will return false, "a", " " will return true.

参数:

cs - char sequence

返回:

is not empty

emptyToDefault

public static String emptyToDefault(String str,
                                    String defaultStr)

return the str if str is not empty, otherwise return defaultStr.

参数:

str - str

defaultStr - default str

返回:

str or default str

emptyToNull

public static String emptyToNull(String str)

return the str if str is not empty, otherwise return null.

参数:

str - str

返回:

str or null

upperFirstAndAddPrefix

public static String upperFirstAndAddPrefix(String str,
                                            String prefix)

Make the first character uppercase and add prefix.
eg: "bc", "a" will return "aBc", null, "a" will return "anull".

参数:

str - str

prefix - prefix

返回:

str with first character uppercase and prefix

upperFirst

public static String upperFirst(String str)

Make the first character uppercase.
eg: "abc" will return "Abc".

参数:

str - str

返回:

str with first character uppercase

isBlank

public static boolean isBlank(CharSequence cs)

Whether the given CharSequence is blank. eg: null, "", " " will return true, "a" will return false.

参数:

cs - char sequence

返回:

is blank

isNotBlank

public static boolean isNotBlank(CharSequence cs)

Whether the given CharSequence is not blank. eg: null, "", " " will return false, "a" will return true.

参数:

cs - char sequence

返回:

is not blank

md5DigestAsHex

public static String md5DigestAsHex(String str)

Md5 digest as hex.

参数:

str - str

返回:

md5 hex

split

public static Collection<String> split(String str,
                                       String splitter)

Split string by given splitter.

参数:

str - str

splitter - splitter

返回:

string list