Java.lang。字符类 - 方法 |设置 2

朗。字符方法

Java.lang。字符类 - 方法 |设置 1

此处讨论字符类的以下方法：

1. toUpperCase() : Java.lang.toUpperCase(char arg)方法根据 Unicode 值将参数中的给定字符转换为其大写。
   句法 ：

   public static char toUpperCase(char arg)
   Parameters : 
   arg : character to be converted to Upper case
   Return : 
   Upper case character of the argumented character.  
   

2. toLowerCase() : Java.lang.toLowerCase(char arg)方法根据 Unicode 值将参数中的给定字符转换为其小写。
   句法 ：

   public static char toLowerCase(char arg)
   Parameters : 
   arg : character to be converted to Lower case
   Return : 
   Lower case character of the argumented character.  
   

3. isMirrored()： Java.lang。 字符.isMirrored(char arg)方法根据 Unicode 值检查传递的参数是否被镜像。在从右到左的文本中显示时，镜像字符应使其字形水平镜像。例如，'\u0028' 左括号在语义上被定义为左括号。这将在从左到右的文本中显示为“（”，但在从右到左的文本中显示为“）”。
   例如： [ ] { } ( )
   句法 ：

   public static boolean isMirrored(char arg)
   Parameters : 
   arg : argumented character 
   true if char 'arg' is mirrored, else false.
   

   解释 toUpperCase()、toLowerCase()、isMirrored() 方法使用的Java代码

   // Java program explaining Character class methods
   // toUpperCase(), toLowerCase(), isMirrored()
   import java.lang.Character;
   public class NewClass
   {
       public static void main(String[] args)
       {
           // Use of toUpperCase() method
           Character g1 = new Character('g');
           Character g2 = new Character('O');
     
           char chUpper = Character.toUpperCase(g1);
           char chUpper1 = Character.toUpperCase(g2);
     
           System.out.println("Upper value for g : "+ chUpper);
           System.out.println("Upper value for O : "+ chUpper1);
           System.out.println("");        
             
           // Use of toLowerCase() method
           char chLower = Character.toLowerCase(g1);
           char chLower1 = Character.toLowerCase(g2);
           System.out.println("Lower value for G : "+ chLower);
           System.out.println("Lower value for O : "+ chLower1);
           System.out.println("");
     
           // Use of isMirrored() method
           Character g3 = new Character('-');
           Character g4 = new Character(')');
           Character g5 = new Character('{');
           Character g6 = new Character(']');
     
           boolean checkBool1 = Character.isMirrored(g3);
           boolean checkBool2 = Character.isMirrored(g4);
           boolean checkBool3 = Character.isMirrored(g5);
           boolean checkBool4 = Character.isMirrored(g6);
             
           System.out.println("Checking - : "+ checkBool1);
           System.out.println("Checking ) : "+ checkBool2);
           System.out.println("Checking { : "+ checkBool3);
           System.out.println("Checking ] : "+ checkBool4);
       }
   }
   

   输出：

   Upper value for g : G
   Upper value for O : O
   
   Lower value for G : g
   Lower value for O : o
   
   Checking - : false
   Checking ) : true
   Checking { : true
   Checking ] : true
   

4. reverseBytes()： Java.lang。 字符 .reverseBytes()方法通过反转参数字符中的字节顺序来返回一个字符。
   句法 ：

   public static char reverseBytes()
   Parameters : 
   cP : code point, need to check
   Return : 
   character with reversed order of bytes in the argumented character
   

5. isAlphabetic()： Java.lang。 字符.isAlphabetic(int cP)方法检查参数字符（代码点）是否是字母表
   句法 ：

   public static boolean isAlphabetic(int codePoint)
   Parameters : 
   cP : code point, need to check.  
   Return : 
   True if character is a Unicode alphabet, else false
   Exception : 
   --> NullPointerException
   --> IndexOutOfBoundsException 
   

6. isValidCodePoint()： Java.lang。 字符.isValidCodePoint(int cP)方法检查参数 Unicode 是否实际有效
   句法 ：

   public static boolean isValidCodePoint(int codePoint)
   Parameters : 
   cP : code point to be tested  
   Return : 
   true if Min code point <  Argumented code point < Max code point
   

   解释使用 isValidCodePoint()、reverseBytes()、isAlphabetical() 方法的Java代码

   // Java program explaining Character class methods
   // isValidCodePoint(), reverseBytes(), isAlphabetical()
   import java.lang.Character;
   public class NewClass
   {
       public static void main(String[] args)
       {
           // Use of reverseBytes() method
           Character g1 = new Character('1');
           Character g2 = new Character('s');
     
           char chreverse = Character.reverseBytes(g1);
           char chreverse1 = Character.reverseBytes(g2);
     
           System.out.println("Reverse char for 1 : "+ chreverse);
           System.out.println("Revrese char for s : "+ chreverse1);
           System.out.println("");
     
           // Use of isAlphabetical() method
           int c1 = 101, c2 = 132;
           boolean check1 = Character.isAlphabetic(c1);
           boolean check2 = Character.isAlphabetic(c2);
           System.out.println("Is Unicode 66 alphabetic  : "+ check1);
           System.out.println("Is Unicode 132 alphabetic : "+ check2);
           System.out.println("");
     
           // Use of isValidCodePoint() method
           int c3 = 0x012343, c4 = 0x01344ffff;
           boolean check4 = Character.isValidCodePoint(c4);
           boolean check3 = Character.isValidCodePoint(c3);
           System.out.println("Validity check : "+ check3);
           System.out.println("Validity check : "+ check4);
       }
   }
   

   输出：

   Reverse char for 1 : ?
   Reverse char for s : ?
   
   Is Unicode 66 alphabetic  : true
   Is Unicode 132 alphabetic : false
   
   Validity check : true
   Validity check : false