java.lang.Character class – methods | Set 2

lang.Character methods

java.lang.Character class – methods | Set 1

Following methods of Character class are discussed here :

1. toUpperCase() : java.lang.toUpperCase(char arg) method converts given character in argument to its Upper case based on Unicode values.
   Syntax :

   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) method converts given character in argument to its Lower case based on Unicode values.
   Syntax :

   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.Character.isMirrored(char arg) method checks whether passed argument is mirrored or not, based on Unicode values. Mirrored characters should have their glyphs horizontally mirrored when displayed in text that is right-to-left. For example, ‘\u0028’ LEFT PARENTHESIS is semantically defined to be an opening parenthesis. This will appear as a “(” in text that is left-to-right but as a “)” in text that is right-to-left.
   e.g. : [ ] { } ( )
   Syntax :

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

Java code explaining use of toUpperCase(), toLowerCase(), isMirrored() methods








// 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);     } }

Output:

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.Character.reverseBytes() method returns a character by reversing the order of bytes in the argumented character.
   Syntax :

   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.Character.isAlphabetic(int cP) method checks whether the argumented character(code point) is an alphabet or not
   Syntax :

   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.Character.isValidCodePoint( int cP) method checks whether the argumented Unicode is actually valid or not
   Syntax :

   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
   

Java code explaining use of isValidCodePoint(), reverseBytes(), isAlphabetical() methods








// 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);     } }

Output:

Reverse char for 1 : ?
Reverse char for s : ?

Is Unicode 66 alphabetic  : true
Is Unicode 132 alphabetic : false

Validity check : true
Validity check : false

This article is contributed by Mohit Gupta. If you like Lazyroar and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the Lazyroar main page and help other Geeks.

Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above.