仅在键与给定值关联的情况下,从此 HashMap 中移除键的 Java 程序


仅当键与给定值关联时,才使用 remove() 方法来移除键。

假设以下内容是我们 HashMap −

// 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));

在此,我们仅在与给定值 600 关联的情况下,才删除键“Belt” −

hm.remove("Belt", 600);

以下是仅在键与给定值关联的情况下,移除键的一个示例 −

示例

 实时演示

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));
      System.out.println("Elements in HashMap...");
      System.out.println(hm);
      // removing a key
      hm.remove("Wallet");
      System.out.println("
Updated HashMap after removing a key..."); System.out.println(hm); // removing a key from a HashMap only if it is associated with a given value hm.remove("Belt", 600); System.out.println("
Updated HashMap after removing a key associated with a given value..."); System.out.println(hm); } }

输出

Elements in HashMap...
[Frames=800, Belt=600, Wallet=700, Bag=1100, Sunglasses=2000]

Updated HashMap after removing an key...
[Frames=800, Belt=600, Bag=1100, Sunglasses=2000]

Updated HashMap after removing a key associated with a given value...
{Frames=800, Bag=1100, Sunglasses=2000}

更新日期: 30-Jul-2019

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