Java == for String objects ceased to work?

Question

  public class Comparison {
        public static void main(String[] args) {
            String s = \"prova\";
            String s2 = \"prova\";
            System.         


        

Answer 1

JLS, 3.10.5 => It is guaranteed that a literal string object will be reused by any other code running in the same virtual machine that happens to contain the same string literal

Answer 2

String s = "prova";
String s2 = "prova";

s and s2 are literal strings which are pointing the same object in String Pool of JVM, so that the comparison returns true.

Answer 3

Source code literals are part of a constant pool, so if the same literal appears multiple times, it will be the same object at runtime.

Answer 4

The JVM may optimize the String usage so that there is only one instance of the "equal" String in memory. In this case also the == operator will return true. But don't count on it, though.

Answer 5

Ideally it should not happen ever. Because java specification guarantees this. So I think it may be the bug in JVM, you should report to the sun microsystems.

Answer 6

You must understand that "==" compares references and "equals" compares values. Both s and s1 are pointing to the same string literal, so their references are the same.