Java IdentityHashMap .containsValue (Object value)

public boolean containsValue(Object value)

import java.util.IdentityHashMap;
import java.util.Map;
// ww w .java 2  s.com
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);

    boolean isavailable = objMap.containsValue("first");

    System.out.println(isavailable);
  }
}