java关键字final用法知识点

public static void main(String[] args) {
    
    //局部变量
    //①基本数据类型
    final int val;//先定义
    // val = val + 1;//报错没有赋值，无法使用
    val = 7 ;//再赋值
    
    //②引用数据类型
    final Score score = new Score("Jack",98,95,90);
    score.toString();
    //score = new Score("Tom",77,89,99);//引用无法再次修改
    score.name = "Tom";
    score.toString();
    
  }

public Score(final String name,int yuWen, int shuXue, int yingYu) {
    //name = "jack";//报错
    this.name = name;
    this.yuWen = yuWen;
    this.shuXue = shuXue;
    this.yingYu = yingYu;
  }