Difference between "== operator" and "equals() method"

"= = operator" is for reference comparison
while
".equals() method" is for content comparison

for example:-

String s1= new String("Happy");
String s2= new String("Happy");

S.O.P (s1==s2)  /// returns false ,as reference of both these are different
while
S.O.P (s1.equals(s2)) /// returns true , as content wise both these are same.i.e. both has same content( "Happy")

 But there is a Loophole