public class StringEqualityTest {
    public static void main(String args[]) {
        String s1 = "abc";
        String s2 = "abc";
        String s3 = new String("abc");
        String s4 = new String("abc");

        System.out.println(s1==s2);
        System.out.println(s3==s4);
        System.out.println(s1.equals(s2));
        System.out.println(s1.equals(s3));
    }
}