修改List内部对象的属性值并保存

Posted 2023-01-26 十一路客

直接通过List.get(i)获取对象obj，并对obj中的属性进行修改即可。因为obj获取的是List中对象的引用，所以对obj的修改会自动同步到对List中去

public class ListTest 
     public static void main(String args[])
        
            User user1=new User();
            List<User> userList=new  ArrayList<User>();
            user1.setName("呵呵");
            user1.setSex("男");
            userList.add(user1);

            User user2=new User();
            user2.setName("嘻嘻");
            user2.setSex("女");
            userList.add(user2);

            User obj1 = userList.get(0);
            obj1.setName("change1");

            User obj2 = new User();
            obj2 = userList.get(1);
            obj2.setName("change2");

            for(User userInfo:userList)
              

                System.out.println(userInfo);
            
        


class User
     //姓名
    private String name;

    //性别
    private String sex;

    public String getName()
    
        return name;
    

    public void setName(String name)
    
        this.name = name;
    

    public String getSex()
    
        return sex;
    

    public void setSex(String sex)
    
        this.sex = sex;
    

    @Override
    public String toString()
    
        return "User [name=" + name + ", sex=" + sex + "]";
    

运行main函数，输出为：

User [name=change1, sex=男]
User [name=change2, sex=女]