class Codeaft
{
    public static void main(String args[])
    {
        String s="HELLO WORLD";

        char c1=s.charAt(0);    //At 0th Position
        System.out.println(c1);

        char c2=s.charAt(5);
        System.out.println(c2);

        char c3=s.charAt(10);
        System.out.println(c3);
    }
}

codeaft@codeaft:~$ javac Codeaft.java
codeaft@codeaft:~$ java Codeaft
H

D
codeaft@codeaft:~$