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Java == for String objects ceased to work?

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

outputs:

true
true

on my machine. Why? Shouldn't be == compare object references equality?

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Java == for String objects ceased to work?

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