Use of equals in JAVA

public class EqualsExample
{ 
    public static void main(String args[])
    { 
        String s1="Gulzar"; 
        String s2="Gulzar"; 
        String s3="GULZAR"; 
        String s4="Ludhiana"; 
        System.out.println("The Strings Gulzar and Gulzar are same = " + s1.equals(s2));
        //true because content and case is same 
        System.out.println("The Strings Gulzar and GULZAR are same = " + s1.equals(s3));
        //false because case is not same 
        System.out.println("The Strings Gulzar and Ludhiana are same = " + s1.equals(s4));
        //false because content is not same 
    }
}