修改 Java HashMap 中与给定键关联的值
首先,创建一个 HashMap 并向其中添加元素 −
// Create a hash map HashMap hm = new HashMap(); // Put elements to the map hm.put("Bag", new Integer(1100)); hm.put("Sunglasses", new Integer(2000)); hm.put("Frames", new Integer(800)); hm.put("Wallet", new Integer(700)); hm.put("Belt", new Integer(600));
现在,要修改与给定键关联的值,请使用 put() 方法。这里,我们正在修改键 “Frames“ 的值 −
hm.put("Frames", "900");
以下是修改与给定键关联的值的一个示例 −
示例
import java.util.*; public class Demo { public static void main(String args[]) { // Create a hash map HashMap hm = new HashMap(); // Put elements to the map hm.put("Bag", new Integer(1100)); hm.put("Sunglasses", new Integer(2000)); hm.put("Frames", new Integer(800)); hm.put("Wallet", new Integer(700)); hm.put("Belt", new Integer(600)); // Get a set of the entries Set set = hm.entrySet(); System.out.println("Elements in HashMap..."); System.out.println(set); hm.put("Frames", "900"); System.out.println("
Updated HashMap Elements..."); System.out.println(hm); } }
输出
Elements in HashMap... [Frames=800, Belt=600, Wallet=700, Bag=1100, Sunglasses=2000] Updated HashMap Elements... {Frames=900, Belt=600, Wallet=700, Bag=1100, Sunglasses=2000}
广告