java.util.WeakHashMap.clear() Method

Description

The clear() method is used to removes all mappings from this map.

Declaration

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

public void clear()

Parameters

• NA

Return Value

NA

Exception

• NA

Example

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

package com.tutorialspoint;

import java.util.Map;
import java.util.WeakHashMap;

public class WeakHashMapDemo {
   public static void main(String[] args) { 
      Map<String, String> weakHashMap = new WeakHashMap<String, String>();
      
      // put keys and values in the Map      
      weakHashMap.put("1", "first");
      weakHashMap.put("2", "two");
      weakHashMap.put("3", "three");
      
      // print the contents  
      System.out.println("Contents in the Map");
      System.out.println(weakHashMap);
      
      // call clear() method
      System.out.println("Clear the Map");
      weakHashMap.clear();
     
      // again print the contents
      System.out.println("Contents in the Map");
      System.out.println(weakHashMap);
   }    
} 

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

Contents in the Map
{1=first, 2=two, 3=three}
Clear the Map
Contents in the Map
{}