Java IdentityHashMap.clear()

public void clear()

/*from   w  w  w . j  a va 2  s.c  o  m*/
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);
    
  }
}