java small exercise of membership forms

Demand: There is a membership form, you can add members, delete members, membership inquiries, show all member information. Members have a name, rank, integral property.

Realization of ideas: a member of the class, with the name, rank, integrating three private property. A membership form class, with a membership table properties (ArrayList collection). A test class.

Key knowledge: ArrayList collection, downward transition (polymorphic knowledge)

Member Class: Vip.java

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

public class Vip{
    private String name;//名字
    private String level;//等级
    private int integral;//积分

    public Vip() {
    }

    public Vip(String name, String level, int integral) {
        this.name = name;
        this.level = level;
        this.integral = integral;
    }

    public String getName() {
        return name;
    }

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

    public String getLevel() {
        return level;
    }

    public void setLevel(String level) {
        this.level = level;
    }

    public int getIntegral() {
        return integral;
    }

    public void setIntegral(int integral) {
        this.integral = integral;
    }
    @Override
    public String toString() {
        return "{" +
                "姓名：'" + name + '\'' +
                ", 会员等级：'" + level + '\'' +
                ", 积分：" + integral +
                '}';
    }
}

Member table class: VipBase.java

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

public class VipBase {
    private ArrayList list = new ArrayList<>();//会员表

    public List getList() {
        return list;
    }

    public void setList(ArrayList list) {
        this.list = list;
    }

    //增加会员
    public void add(Vip vip) {
        this.getList().add(vip);//把会员vip添加到会员表
    }

    //查找名字为name的会员
    public void find(String name){
        boolean flag = false;//中间变量，判断是否存在名字是name的会员
        for (Object o :
                this.getList()) {
            Vip v = (Vip) o;//因为会员表中是对象，把其强制转换为Vip类
            if(v.getName().equals(name)){
                System.out.println("查询结果："+v);
                flag = true;//存在
            }
        }
        if(!flag){//如果不存在
            System.out.println("抱歉，系统里没有这个人");
        }
       /*
       上述增强for循环也可换成下面的普通for循环：
       for (int i=0;i<this.getList().size();i++){
            Vip v = (Vip) this.getList().get(i);
            if(v.getName().equals(name)){
                System.out.println("查询结果："+v);
                flag = true;
            }
       }*/
    }

    //删除名字为name的会员
    public void delete(String name){
        for (Object o :
                this.getList()) {
            Vip v = (Vip) o;
            if(v.getName().equals(name)){
//                this.getList().remove(v);
                System.out.println("已成功删除"+v);
            }
        }

    }

    //显示会员
    public void show(){
        for (Object o :
                this.getList()) {
            Vip v = (Vip) o;
            System.out.println(v);
        }
    }


}

Test categories: Demo.java

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

public class Demo {
    public static void main(String[] args) {
        //创建会员表
        VipBase vipBase = new VipBase();

        //创建会员
        Vip vip = new Vip("张三", "普通", 100);
        Vip vip1 = new Vip("王五","紫金",10000);
        Vip vip2 = new Vip("赵宇","白金",1000);
        Vip vip3 = new Vip("李桥","钻石",100000);

        //把会员添加到会员表
        vipBase.add(vip);
        vipBase.add(vip1);
        vipBase.add(vip2);
        vipBase.add(vip3);
//        System.out.println("输出所有会员，看是否添加成功：");
//        System.out.println(vipBase.getList());

        //查找会员
        vipBase.find("李桥");//查询结果：{姓名：'李桥', 会员等级：'钻石', 积分：100000}
        vipBase.find("李中");//抱歉，系统里没有这个人

        //删除会员
        vipBase.delete("赵宇");//已成功删除{姓名：'赵宇', 会员等级：'白金', 积分：1000}
        System.out.println("删除上面成员后的会员表：");
        System.out.println(vipBase.getList());

        //显示所有会员
        vipBase.show();
    }
}