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}
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