Java Collection Tutorial - Java IdentityHashMap.keySet()

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Syntax

IdentityHashMap.keySet() has the following syntax.

public Set <K> keySet()

Example

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

//  w  w  w .jav  a2s  .  c  om
import java.util.IdentityHashMap;
import java.util.Map;
import java.util.Set;

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);

    // create a set view
    Set<Object> nset=objMap.keySet();
    
    System.out.println("Set view is: " + nset);
  }
}

The code above generates the following result.

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