In this post, we will learn how to remove an entry from HashMap in Java with an example.

We use the following HashMap class methods to remove an entry from HashMap:

• Remove a key from a HashMap | remove(Object key)
• Remove a key from a HashMap only if it is associated with a given value | remove(Object key, Object value)

Remove Entry from HashMap Java

import java.util.LinkedHashMap;
import java.util.Map;

public class RemoveKeysFromHashMapExample {
    public static void main(String[] args) {
      Map<String, String> userCityMapping = new LinkedHashMap<String, String>();

         userCityMapping.put("John", "New York");
         userCityMapping.put("Ramesh", "Pune");
         userCityMapping.put("Steve", "London");

         System.out.println("userCityMapping HashMap : " + userCityMapping);
         
        // Remove a key from the HashMap
        String userName = "Ramesh";
        userCityMapping.remove(userName);

        // remove entry - key-value pair
        boolean isRemoved = userCityMapping.remove("John", "New York");
        
        System.out.println(" entry removed : " + isRemoved);
        
        System.out.println("userCityMapping HashMap After removed : " + userCityMapping);
    }
}

Output

userCityMapping HashMap : {John=New York, Ramesh=Pune, Steve=London}
 entry removed : true
userCityMapping HashMap After removed : {Steve=London}

Reference

https://www.javaguides.net/2018/06/guide-to-hashmap-class.html

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