修改与Java HashMap中给定键关联的值
首先，创建一个HashMap并向其中添加元素-
//创建一个哈希映射
HashMap hm = new HashMap();
//将元素放入映射
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。在这里，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示例-
示例
import java.util.*;
public class Demo {
public static void main(String args[]) {
//创建一个哈希映射
HashMap hm = new HashMap();
//将元素放入映射
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));
//获取一组条目
Set set = hm.entrySet();
System.out.println("Elements in HashMap...");
System.out.println(set);
hm.put("Frames", "900");
System.out.println("\nUpdated HashMap Elements...");
System.out.println(hm);
}
}输出结果
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}