JAVA: Immutable String… wait for it … reference

 

Simply said, String itself is a ‘reference obj’ not a ‘data obj’

String s1 = "Mississippi";
String s2 = s1;
s1 = s1.replace('i', '!');
System.out.println(s1); // Prints "M!ss!ss!pp!"
System.out.println(s2); // Prints "Mississippi"