Java Program to remove key value pair from HashMap?

Let’s say the following is our HashMap −

HashMap<String, String>map = new HashMap<String, String>();

Add key value pair to the HashMap −

map.put("1", "A");
map.put("2", "B");
map.put("3", "C");
map.put("4", "D");
map.put("5", "E");
map.put("6", "F");
map.put("7", "G");
map.put("8", "H");
map.put("9", "I");

Now, use the remove() method to remove the key-value pair −

map.remove("5");

Example

 Live Demo

import java.util.Collection;
import java.util.HashMap;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Set;
public class Demo {
   public static void main(String[] args) {
      HashMap<String, String>map = new HashMap<String, String>();
      map.put("1", "A");
      map.put("2", "B");
      map.put("3", "C");
      map.put("4", "D");
      map.put("5", "E");
      map.put("6", "F");
      map.put("7", "G");
      map.put("8", "H");
      map.put("9", "I");
      System.out.println("HashMap...");
      for (String res: map.keySet()) {
         System.out.println(res);
      }
      map.remove("5");
      System.out.println("Updated HashMap...");
      for (String res: map.keySet()) {
         System.out.println(res);
      }
      map.remove("8");
      System.out.println("Updated HashMap...");
      for (String res: map.keySet()) {
         System.out.println(res);
      }
   }
}

Output

HashMap...
1
2
3
4
5
6
7
8
9
Updated HashMap...
1
2
3
4
6
7
8
9
Updated HashMap...
1
2
3
4
6
7
9

Samual Sam

Published on 25-Apr-2019 12:46:35