面向对象练习
题目要求:
定义一个自定义类 类名是(Member)
定义一个测试类App,在该类中定义一个数组 Member members[]
将学生添加进Member数组 编写方法随机抽取Member,并将该Member的所有属性输出
public static void main(String[] arge){ //定义一个集合 ArrayList<Member> members=new ArrayList<>(); //实例化Member Scanner a = new Scanner(System.in); //做一个while死循环 boolean flag = true; while(flag){ System.out.println("请选择: \n 1.新增人员 \n 2.随机显示 \n 3.结束操作"); int num = a.nextInt(); switch(num){ case 1: //新增人员:将Member添加进Member数组 Member mem = new Member(); mem.getMember(); members.add(mem); break; case 2: //随机显示:随机抽取Member并显示 getRandomMember(members); break; case 3: //结束操作:停止循环 flag = false; break; default: System.out.println("输入错误\n"); } } } //编写方法随机抽取 public static void getRandomMember(ArrayList<Member> members) { int random = new Random().nextInt(members.size()); System.out.println(members.get(random)); } } //Member类 class Member{ //定义变量 String name; int id; int age; //取得值 public void getMember(){ Scanner a = new Scanner(System.in); System.out.println("请输入名字:"); name = a.nextLine(); System.out.println("请输入ID:"); id = a.nextInt(); System.out.println("请输入年龄:"); age = a.nextInt(); } //重写toString()用于打印member(ArrayList)的元素 @Override public String toString() { return "name是" + name + "\nid是" + id + "\nage是" + age + "\n" ; } }