谈谈final

用final修饰类

用final修饰方法

 用final修饰参数

    public void f2(final int a ,final User u) {
            a=15;                   //error
        u.setPassWord("sdf");  //correct
        u=new User();          //error
        System.out.println("类b中的f2被调用了");
    }

 用final修饰成员变量

import java.util.ArrayList;
import java.util.List;

public class ListWrapper<E> {

    private final List<E> list;
    
    private final int a=15;

    public ListWrapper(){
        list = new ArrayList<E>();
//    a=10;
    }
    
    public boolean contains(E e){
        return list.contains(e);
    }
    
    public void add(E e){
        list.add(e);
    }
    
    public void remove(E e){
        list.remove(e);
    }
    public static void main(String[] args){

        ListWrapper<Person> list=new ListWrapper<Person>();
        Person a=new Person();
        Person b=new Person();
        list.add(a);
        System.out.println(list.contains(a));
        list.remove(a);
    }
}

谈谈final

原文：http://blog.csdn.net/dlf123321/article/details/44493691