p4-equals系列：String.intern()方法的作用

public class InternTest {
    public static void main(String[] args) {
        String s = "abc";
        String s2 = new String("abc");
        String s3 = s2.intern();
        System.out.println(s == s2);
        System.out.println(s == s3);
    }
}

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