Java String的intern用法解析

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
  }
}