Java core question: string equality

Question

public class A {

    static String s1 = "I am A";

    public static void main(String[] args) {
        String s2 = "I am A";
        System.out.println(s1 == s2);
    }
}

Above the outputs of the program "true". Both are two different identifiers / objects, how is the output true?

My understanding is that the JVM will create a different link for each object, if so, how is the result true?

Answer 1

Java manages the literal pool String. He repeats these literals whenever possible. Therefore, two objects are actually the same object String, but ==returns true.

I believe this is called string interning

Answer 2

== , . , , , , . , .

String s = new String("foo");
String t = new String("foo");

== false s.equals(t) true.

Answer 3

Java :

- , , , (§15.28) - "", , String.intern.

Answer 4

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Answer 5

. . equal ( String). , compareTo ( String), , .

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