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  }}