Replacing Words in Strings

public class Replace2
{ 
    public static void main(String args[])
    { 
        String s1="My name is Sukhvir Kumar"; 
        String s2="I am working in GGI Khanna.";
        System.out.println("\nOld String is = " + s1 +"." + s2);
        String s3=s1.replace("Kumar","Singh");
        String s4=s2.replace("Khanna","Ludhiana");
        System.out.println("\nNew String is = " + s3 +"." + s4);
    }
}