Character Class

1. isLetter() Method Example

Description : isLetter() Method determines whether the specified char value is a letter.
public class MethodOne {
      public static void main(String args[]){
            System.out.println(Character.isLetter('A'));
            System.out.println(Character.isLetter('6'));
            System.out.println(Character.isLetter('x'));
      }
}

Output :

true       false       true.

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2. isDigit() Method Example

Description : isDigit() Method determines whether the specified char value is a digit.
public class MethodTwo {
      public static void main(String args[]) {
            System.out.println(Character.isDigit('10'));
            System.out.println(Character.isDigit('B'));
            System.out.println(Character.isDigit('5'));
      } }

Output :

true       false       true.

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3. isWhitespace() Method Example

Description : isWhitespace() Method determines whether the specified char value is a white space, which includes space, tab, or new line.
public class MethodThree{
      public static void main(String args[] ) {
            System.out.println(Character.isWhitespace('B'));
            System.out.println(Character.isWhitespace(' '));
            System.out.println(Character.isWhitespace('\n'));
            System.out.println(Character.isWhitespace('\f'));
            System.out.println(Character.isWhitespace('\t'));
      }
}

Output :

false       true       true       true       true.

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4. isUpperCase() Method Example

Description : isUpperCase() Method determines whether the specified char value is uppercase.
public class MethodFour{
      public static void main(String args[] ) {
            System.out.println(Character.isUpperCase('B'));
            System.out.println(Character.isUpperCase('10'));
            System.out.println(Character.isUpperCase('b'));
            System.out.println(Character.isUpperCase('\f'));
            System.out.println(Character.isUpperCase('\t'));
      }
}

Output :

true       false       false       false       false.

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5. isLowerCase() Method Example

Description : isLowerCase() Method determines whether the specified char value is uppercase.
public class MethodFour{
      public static void main(String args[] ) {
            System.out.println(Character.isLowerCase('B'));
            System.out.println(Character.isLowerCase('10'));
            System.out.println(Character.isLowerCase('b'));
            System.out.println(Character.isLowerCase('\f'));
            System.out.println(Character.isLowerCase('\t'));
      }
}

Output :

false       false       true       false       false.

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6. toUpperCase() Method Example

Description : toUpperCase() Method determines whether the specified char value is uppercase.
public class MethodFour{
      public static void main(String args[] ) {
            System.out.println(Character.toUpperCase('B'));
            System.out.println(Character.toUpperCase('K'));
            System.out.println(Character.toUpperCase('b'));
            System.out.println(Character.toUpperCase('n'));
      }
}

Output :

B       K       B       N.

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7. toLowerCase() Method Example

Description : toLowerCase() Method returns the lowercase form of the specified char value.
public class MethodFour {
      public static void main(String args[] ) {
            System.out.println(Character.toLowerCase('B'));
            System.out.println(Character.toLowerCase('K'));
            System.out.println(Character.toLowerCase('k'));
            System.out.println(Character.toLowerCase('n'));
      }
}

Output :

b       k       k       n.

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8. toString() Method Example

Description : toString() Method returns a String object representing the specified character value, that is, a one-character string.
public class MethodFive {
      public static void main(String args [] ) {
            System.out.println(Character.toString('B'));
            System.out.println(Character.toString('12'));
            System.out.println(Character.toString('z'));
      }
}

Output :

B       12       z.

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