Java Collection Tutorial - Java HashMap.clear()

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Syntax

HashMap.clear() has the following syntax.

public void clear()

Example

In the following code shows how to use HashMap.clear() method.

/*  ww w .  ja  va 2  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("Initial map elements: " + newmap);
      
      // clear hash map
      newmap.clear();
      
      System.out.println("Map elements after clear: " + newmap);
   }    
}

The code above generates the following result.

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