package com.test;/** * final修饰一个变量练习 * @author Mrjiao * */public class FinalA {        private final static StringBuffer A=new StringBuffer("I have final , Who can change me？");        public static void main(String[] args){        //编译出错        //A=new StringBuffer("I can change you ,Oh,No,that why!!!");        System.out.println(A);        A.append("I can change you,haha!");//所以final关键字修饰一个变量时，是指引用变量不能被改变！！！        System.out.println(A);    }}