Java Collection Tutorial - Java IdentityHashMap.putAll(Map <? extends K ,? extends V > m)

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Syntax

IdentityHashMap.putAll(Map <? extends K ,? extends V > m) has the following syntax.

public void putAll(Map <? extends K ,? extends V > m) 

Example

In the following code shows how to use IdentityHashMap.putAll(Map <? extends K ,? extends V > m) method.

// w ww .  ja  v a 2 s.c om

import java.util.IdentityHashMap;

public class Main {
   public static void main(String args[]) {

      IdentityHashMap<Integer,String> ihmap1 = new IdentityHashMap<Integer,String>();
      IdentityHashMap<Integer,String> ihmap2 = new IdentityHashMap<Integer,String>();
           
      // populate the ihmap1
      ihmap1.put(1, "from");
      ihmap1.put(2, "java2s.com");
      ihmap1.put(3, "tutorial");
      
      System.out.println("Value of ihmap1 before: " + ihmap1);
      System.out.println("Value of ihmap2 before: " + ihmap2);
      
      // put all values from ihmap1 to ihmap2
      ihmap2.putAll(ihmap1);
      
      System.out.println("Value of ihmap2 after: " + ihmap2);
   }    
}

The code above generates the following result.

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