Java String的intern方法

package com.ecarx.daa.data.manager.utils;

public class StringTest {
    public static void main(String[] args) {
        String a = new StringBuffer("a").append("a").toString();
        String b = new StringBuffer("a").append("a").toString();
        System.out.println(a == b); // false
        if (a.intern() == a) { //true
            System.out.println("intern method was == the first object"); 
        }
        System.out.println(a.intern() == b); //false

        System.out.println(b.intern() == b); //false
        System.out.println(a.intern() == b.intern()); //true
    }
}