JAVA-21-homework

2021-01-03 07:31

阅读：803

标签：add style practice ring rgs string alt span util

package practice;

import java.util.*;

public class Test {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        show();
    }
    public static void show() {
    Collection a = new ArrayList();
    a.add("欧欧        Q仔");
    a.add("亚亚        Q妹");
    a.add("菲菲        Q妹");
    a.add("美美        Q妹");
    System.out.println("共计有"+a.size()+"只企鹅");
    System.out.println("分别是：");
    for (int i = 0; i ) {
        System.out.println(((ArrayList) a).get(i));
    }
    a.remove("菲菲        Q妹");
    a.remove("美美        Q妹");
    System.out.println("删除之后还有"+a.size()+"只企鹅");
    System.out.println("分别是：");
    for (int i = 0; i ) {
        System.out.println(((ArrayList) a).get(i));
    }
    a.contains("美美        Q妹");
    if(true) {
        System.out.println("集合中不包含美美的消息");
    }else {
        System.out.println("集合中包含美美的消息");
    }
    }
}