Deleting a Key and its Value from HashMap in Java

In this tutorial, we'll see how to remove a specific key and its value from HashMap in Java by specifying the key or key-value pair.

We'll use the remove(Object key) which removes the value of a specific key from the HashMap. If the key exists, the remove() method returns the element and removes the key-value pair.

import java.util.HashMap; 

public class remove_element_HashMap {

 public static void main(String[] args) {
 
 HashMap map = new HashMap(); 
 map.put("value1",15); 
 map.put("value2",48); 
 map.put("value3",21); 
 map.put("value4",87); 
 map.put("value5",159); 
 map.put("value6",17); 

 System.out.println("Before removal: "+map); 
 
 Object elmDeleted = map.remove("value3"); 
 System.out.println("the deleted item is "+elmDeleted); 
 
 System.out.println("Before "+elmDelete+": "+map) is removed; 
 }
}

Output:

Before removal: {value5=159, value6=17, value3=21, value4=87, value1=15, value2=48}
item deleted is 21
Before removing 21:  {value5=159, value6=17, value4=87, value1=15, value2=48}