ArrayList案例

实现代码如下

import java.util.ArrayList;


public class ListTest {
	public static void main(String args[]){
		
		//创建list对象
		ArrayList<User> list = new ArrayList<User>();
		
		//创建User对象
		User u = new User("li",20);
		User u2 = new User("wang", 23);
		
		//往list添加值
		list.add(u);
		list.add(u2);
		
		System.out.println("list 长度为"+list.size());
		//循环取出user值
		for(User us : list){
			System.out.println("name==="+us.getName()+";age==="+us.getAge());
			
		}
		
		list.remove(u2);
		list.remove(u);
		System.out.println("list 长度为"+list.size());
		
		for(User us : list){
			System.out.println("name==="+us.getName()+";age==="+us.getAge());
			
		}
	}
	

}

实体类

public class User {
	private String name;
	private Integer age;
	
	
	//构造方法
	public User(String name,Integer age){
		this.name = name;
		this.age = age;
		
	}

	public Integer getAge() {
		return age;
	}

	public void setAge(Integer age) {
		this.age = age;
	}

	public String getName() {
		return name;
	}

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

}