Java Program to remove a key from a HashMap

To remove a key from HashMap, use the remove() method.

First, create a HashMap and add elements −

// 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));

Let us now remove a key −

hm.remove("Wallet");

The following is an example to remove a key from a HashMap −

Example

 Live Demo

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);
      hm.remove("Wallet");
      System.out.println("
Updated HashMap after removing a key...");
      System.out.println(hm);
   }
}

Output

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

Updated HashMap after removing a key...
{Frames=800, Belt=600, Bag=1100, Sunglasses=2000}