java.util.HashMap.clear() Method


Advertisements


Description

The clear() method is used to remove all of the mappings from this map.

Declaration

Following is the declaration for java.util.HashMap.clear() method.

public void clear()

Parameters

NA

Return Value

NA

Exception

NA

Example

The following example shows the usage of java.util.HashMap.clear()

Live Demo
package com.tutorialspoint;

import java.util.*;

public class HashMapDemo {
   public static void main(String args[]) {
      
      // create hash map
      HashMap newmap = new HashMap();

      // populate hash map
      newmap.put(1, "tutorials");
      newmap.put(2, "point");
      newmap.put(3, "is best"); 

      System.out.println("Initial map elements: " + newmap);

      // clear hash map
      newmap.clear();

      System.out.println("Map elements after clear: " + newmap);
   }    
}

Let us compile and run the above program, this will produce the following result.

Initial map elements: {1=tutorials, 2=point, 3=is best}
Map elements after clear: {}

java_util_hashmap.htm

Advertisements