Strings (langx-java 0.0.2 API)

java.lang.Object
- com.jn.langx.util.Strings

```
public class Strings
extends Object
```

方法概要

所有方法静态方法具体方法
限定符和类型	方法和说明
`static int`	`decodeHexNibble(char c)` Helper to decode half of a hexadecimal number from a string.
`static String`	`deleteWhitespace(String str)` Deletes all whitespaces from a String as defined by `Character.isWhitespace(char)`.
`static byte[]`	`getBytesUtf8(String string)`
`static boolean`	`isBlank(String str)` judge a string has some whitespace at most
`static boolean`	`isEmpty(String str)` judge a string is null or ""
`static boolean`	`isNotBlank(String str)`
`static boolean`	`isNotEmpty(String str)`
`static String`	`join(String separator, Iterable objects)`
`static String`	`join(String separator, Iterator objects)` append all objects with the specified separator
`static String`	`newStringUsAscii(byte[] bytes)` Constructs a new `String` by decoding the specified array of bytes using the US-ASCII charset.
`static String`	`newStringUtf8(byte[] bytes)` Constructs a new `String` by decoding the specified array of bytes using the UTF-8 charset.
`static String[]`	`split(String string, String separator)` split a string, the returned array is not contains: whitespace, null.
`static boolean`	`substringMatch(CharSequence str, int index, CharSequence substring)` Test whether the given string matches the given substring at the given index.
`static String`	`truncate(String string, int length)` Get substring from 0 to a specified length equals: string.substring(0, length)

从类继承的方法 java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- 方法详细资料
  - isEmpty
```
public static boolean isEmpty(String str)
```
    judge a string is null or ""
    
    参数:
    
    str - the specified string
    
    返回:
    
    whether is null or ""
  - isNotEmpty
```
public static boolean isNotEmpty(String str)
```
  - isBlank
```
public static boolean isBlank(String str)
```
    judge a string has some whitespace at most
    
    参数:
    
    str - the specified string
    
    返回:
    
    the judge result
  - isNotBlank
```
public static boolean isNotBlank(String str)
```
  - truncate
```
public static String truncate(@NonNull
                              String string,
                              int length)
```
    Get substring from 0 to a specified length equals: string.substring(0, length)
    
    参数:
    
    string - a string will be truncated
    
    length - new string's length
    
    返回:
    
    the new string
  - join
```
public static String join(@NonNull
                          String separator,
                          @Nullable
                          Iterator objects)
```
    append all objects with the specified separator
    
    参数:
    
    separator - the specified separator
    
    objects - the dbjects that will be append
    
    返回:
    
    the new string
  - join
```
public static String join(@NonNull
                          String separator,
                          @Nullable
                          Iterable objects)
```
  - split
```
public static String[] split(@Nullable
                             String string,
                             @Nullable
                             String separator)
```
    split a string, the returned array is not contains: whitespace, null. every element in string[] has the trim() invoked
  - decodeHexNibble
```
public static int decodeHexNibble(char c)
```
    Helper to decode half of a hexadecimal number from a string.
    
    参数:
    
    c - The ASCII character of the hexadecimal number to decode. Must be in the range [0-9a-fA-F].
    
    返回:
    
    The hexadecimal value represented in the ASCII character given, or -1 if the character is invalid.
  - substringMatch
```
public static boolean substringMatch(CharSequence str,
                                     int index,
                                     CharSequence substring)
```
    Test whether the given string matches the given substring at the given index.
    
    参数:
    
    str - the original string (or StringBuilder)
    
    index - the index in the original string to start matching against
    
    substring - the substring to match at the given index
  - getBytesUtf8
```
public static byte[] getBytesUtf8(String string)
```
  - newStringUtf8
```
public static String newStringUtf8(byte[] bytes)
```
    Constructs a new String by decoding the specified array of bytes using the UTF-8 charset.
    
    参数:
    
    bytes - The bytes to be decoded into characters
    
    返回:
    
    A new String decoded from the specified array of bytes using the UTF-8 charset, or null if the input byte array was null.
    
    抛出:
    
    NullPointerException - Thrown if Charsets.UTF_8 is not initialized, which should never happen since it is required by the Java platform specification.
    
    从以下版本开始:
    
    As of 1.7, throws NullPointerException instead of UnsupportedEncodingException
  - newStringUsAscii
```
public static String newStringUsAscii(byte[] bytes)
```
    Constructs a new String by decoding the specified array of bytes using the US-ASCII charset.
    
    参数:
    
    bytes - The bytes to be decoded into characters
    
    返回:
    
    A new String decoded from the specified array of bytes using the US-ASCII charset, or null if the input byte array was null.
    
    抛出:
    
    NullPointerException - Thrown if Charsets.US_ASCII is not initialized, which should never happen since it is required by the Java platform specification.
    
    从以下版本开始:
    
    As of 1.7, throws NullPointerException instead of UnsupportedEncodingException
  - deleteWhitespace
```
public static String deleteWhitespace(String str)
```
    Deletes all whitespaces from a String as defined by Character.isWhitespace(char).
```
 StringUtils.deleteWhitespace(null)         = null
 StringUtils.deleteWhitespace("")           = ""
 StringUtils.deleteWhitespace("abc")        = "abc"
 StringUtils.deleteWhitespace("   ab  c  ") = "abc"
 
```
    参数:
    
    str - the String to delete whitespace from, may be null
    
    返回:
    
    the String without whitespaces, null if null String input

类 Strings

方法概要

从类继承的方法 java.lang.Object

方法详细资料

isEmpty

isNotEmpty

isBlank

isNotBlank

truncate

join

join

split

decodeHexNibble

substringMatch

getBytesUtf8

newStringUtf8

newStringUsAscii

deleteWhitespace