编程题-ArrayList的使用

 

 

package com.lin.test_;

import java.util.ArrayList;
import java.util.Iterator;

public class text2 {

    public static void main(String[] args) {

        ArrayList list = new ArrayList();
        Car car = new Car("宝马", "400000");
        Car car2 = new Car("宾利", "5000000");

        //add:添加单个元素
        list.add(car);
        list.add(car2);
        System.out.println("1 " + list);
        //remove:删除指定元素
        list.remove(1);
        System.out.println("2 " + list);
        //contains:查找元素是否存在
        System.out.println("3 " + list.contains(car));
        //size:获取元素个数
        System.out.println("4 " + list.size());
        //isEmpty:判断是否为空
        System.out.println("5 " + list.isEmpty());
        //clear:清空
        list.clear();
        System.out.println("6 " + list);
        //addAll:添加多个元素
        list.add(car);
        list.add(car2);
        list.addAll(list);
        System.out.println("7 " + list);
        //containsAll:查找多个元素是否“都”存在
        ArrayList list1 = new ArrayList();
        list1.add(car);
        list1.add(new Car("AE86", "1000000"));
        System.out.println("8 " + list.containsAll(list1));
        //removeAll:删除多个元素
        list.removeAll(list1);
        System.out.println("9 " + list);
        //使用增强for循环遍历
        System.out.println("10 ");
        list.addAll(list1);
        for (Object obj: list){
            System.out.println(obj);
        }
        //使用迭代器遍历
        System.out.println("11 ");
        Iterator iterator = list.iterator();
        while (iterator.hasNext()){
            System.out.println(iterator.next());
        }


    }
}

class Car {

    private String name;
    private String price;

    public Car(String name, String price) {
        this.name = name;
        this.price = price;
    }

    public String getName() {
        return name;
    }

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

    public String getPrice() {
        return price;
    }

    public void setPrice(String price) {
        this.price = price;
    }

    @Override
    public String toString() {
        return "Car{" +
                "name=" + name +
                ", price=" + price +
                '}';
    }

}

 运行结果：

1 [Car{name=宝马, price=400000}, Car{name=宾利, price=5000000}]
2 [Car{name=宝马, price=400000}]
3 true
4 1
5 false
6 []
7 [Car{name=宝马, price=400000}, Car{name=宾利, price=5000000}, Car{name=宝马, price=400000}, Car{name=宾利, price=5000000}]
8 false
9 [Car{name=宾利, price=5000000}, Car{name=宾利, price=5000000}]
10
Car{name=宾利, price=5000000}
Car{name=宾利, price=5000000}
Car{name=宝马, price=400000}
Car{name=AE86, price=1000000}
11
Car{name=宾利, price=5000000}
Car{name=宾利, price=5000000}
Car{name=宝马, price=400000}
Car{name=AE86, price=1000000}