泛型类抽奖小练习

package Four;

import java.util.ArrayList;
import java.util.Random;

/**
 * 抽奖器
 * @author Administrator
 */
public class ProductGetter<T> {
    //写一个随机数 奖品的随机
    Random random = new Random();
    //设置一个礼物
    private  T product;
    //创建一个装礼物的箱子
    ArrayList<T> list = new ArrayList<>();
    //要写一个方法 把把礼物添加进箱子
    public void addProduct(T t){
        list.add(t);
    }
    //在写一个方法得到的奖品
    public T getProduct(){
        product = list.get(random.nextInt(list.size()));
        return product;
    }
}

package Four;

/**
 * @author Administrator
 */
public class MainClass {
    public static void main(String[] args) {
        ProductGetter<String>  stringProductGetter = new ProductGetter<>();
        String[] strings = {"苹果手机","华为手机","扫地机器人","小米家具"};
        for (int i = 0; i <strings.length ; i++) {
            stringProductGetter.addProduct(strings[i]);
        }
        System.out.println("恭喜你获奖"+stringProductGetter.getProduct());

        System.out.println("--------------------------");
        ProductGetter<Integer> productGetter = new ProductGetter<>();
        int[] array = {3000,2000,1000,800};
        for (int i = 0; i <array.length ; i++) {
            productGetter.addProduct(array[i]);
        }
        System.out.println("恭喜你获奖"+productGetter.getProduct()+"元");
    }
}