Java Collection Tutorial - Java HashMap.remove(Object key)

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Syntax

HashMap.remove(Object key) has the following syntax.

public V remove(Object key)

Example

In the following code shows how to use HashMap.remove(Object key) method.

/*from  www  .  ja  v  a2 s.  c o  m*/
import java.util.HashMap;

public class Main {
   public static void main(String args[]) {
      HashMap<Integer, String> newmap = new HashMap<Integer, String>();      
      
      // populate hash map
      newmap.put(1, "tutorials");
      newmap.put(2, "from");
      newmap.put(3, "java2s.com");
      
      System.out.println("Values before remove: "+ newmap);
      
      // remove value for key 2
      newmap.remove(2);

      System.out.println("Values after remove: "+ newmap);
   }    
}

The code above generates the following result.

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