Java Collection Tutorial - Java WeakHashMap.clear()

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Syntax

WeakHashMap.clear() has the following syntax.

public void clear()

Example

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

/* w w w .  ja  v  a  2 s. co m*/

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

public class Main {
   public static void main(String[] args) { 
      Map<String, String>  weakHashMap = new WeakHashMap<String, String> ();
      
            
      weakHashMap.put("1", "first");
      weakHashMap.put("2", "two");
      weakHashMap.put("3", "from java2s.com");
      
      // 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);
   }    
}

The code above generates the following result.

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