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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); } }
运行结果 :
正在执行...
