class KW
{
    public static void main(String args[])
    {
        System.out.println("———————————————————————————————————————————");
        System.out.println("Java implementation of Character class");
        System.out.println("———————————————————————————————————————————");
        System.out.println(Character.isLetter('S'));
        System.out.println(Character.isDigit('7'));
        System.out.println(Character.isUpperCase('S'));
        System.out.println(Character.isLowerCase('w'));
        System.out.println(Character.isWhitespace(' '));
        System.out.println(Character.isWhitespace('\n'));
        System.out.println(Character.isWhitespace('\t'));
        System.out.println(Character.isLetter('*'));
        System.out.println(Character.isDigit('@'));
        System.out.println(Character.toLowerCase('A'));
        System.out.println(Character.toUpperCase('a'));
        System.out.println(Character.toString('Q'));
        System.out.println("———————————————————————————————————————————");
    }
}

kodingwindow@kw:~$ javac KW.java
kodingwindow@kw:~$ java KW
———————————————————————————————————————————
Java implementation of Character class
———————————————————————————————————————————
true
true
true
true
true
true
true
false
false
a
A
Q
———————————————————————————————————————————
kodingwindow@kw:~$