1. String s1 = "hI".toUpperCase();
2. String s2 = "HI".toUpperCase();
3. String s = "HI";
4. System.out.println(s == s1); // Prints False
5. System.out.println(s == s2); // Prints True
Can some body please explain why line 4 is printing false and
line 5 is printing true.