import java.util.HashMap;

​

public class Main {

    public static void main(String[] args) {

        //创建一个 HashMap

        HashMap<String, Integer> prices = new HashMap<>();

​

        // 往HashMap中添加映射项

        prices.put("Shoes", 200);

        prices.put("Bag", 300);

        prices.put("Pant", 150);

        System.out.println("HashMap: " + prices);

​

        // 重新计算鞋子打了10%折扣后的值

        int newPrice = prices.compute("Shoes", (key, value) -> value - value * 10/100);

        System.out.println("Discounted Price of Shoes: " + newPrice);

​

        // 输出更新后的HashMap

        System.out.println("Updated HashMap: " + prices);

    }

}