Java Collection Tutorial - Java IdentityHashMap.clear()

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Syntax

IdentityHashMap.clear() has the following syntax.

public void clear()

Example

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

/* w  w w .  j  a va2s  . c  om*/
import java.util.IdentityHashMap;
import java.util.Map;

public class Main {
  public static void main(String[] argv) throws Exception {
    Map<Object, Object> objMap = new IdentityHashMap<Object, Object>();

    Object o1 = new Integer(123);
    Object o2 = new Integer(123);
    objMap.put(o1, "first");
    objMap.put(o2, "from java2s.com");

    Object v1 = objMap.get(o1); 
    System.out.println(v1);
    Object v2 = objMap.get(o2); 
    System.out.println(v2);

    objMap.clear();
      
    System.out.println("Map content after clear: " + objMap);
    
  }
}

The code above generates the following result.

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