Example usage for java.util IdentityHashMap clone

Introduction

In this page you can find the example usage for java.util IdentityHashMap clone.

Prototype

public Object clone() 

Source Link

Document

Returns a shallow copy of this identity hash map: the keys and values themselves are not cloned.

Usage

From source file:Main.java

public static void main(String[] argv) throws Exception {
    IdentityHashMap<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);/* w  ww. j  av  a 2 s  .  c  o  m*/
    System.out.println(v1);
    Object v2 = objMap.get(o2);
    System.out.println(v2);

    // clone the map
    IdentityHashMap ihmapclone = (IdentityHashMap) objMap.clone();

    System.out.println("Cloned map content: " + ihmapclone);

}

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From source file:com.google.gwt.emultest.java.util.IdentityHashMapTest.java

public void testEquals() {
    IdentityHashMap hashMap = new IdentityHashMap();
    checkEmptyHashMapAssumptions(hashMap);

    hashMap.put(KEY_KEY, VALUE_VAL);//from   w w w. j a  va  2  s  .  c o  m

    IdentityHashMap copyMap = (IdentityHashMap) hashMap.clone();

    assertTrue(hashMap.equals(copyMap));
    hashMap.put(VALUE_VAL, KEY_KEY);
    assertFalse(hashMap.equals(copyMap));
}

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From source file:com.google.gwt.emultest.java.util.IdentityHashMapTest.java

public void testClone() {
    IdentityHashMap srcMap = new IdentityHashMap();
    checkEmptyHashMapAssumptions(srcMap);

    // Check empty clone behavior
    IdentityHashMap dstMap = (IdentityHashMap) srcMap.clone();
    assertNotNull(dstMap);/* ww  w  .  j a  va2  s . c o  m*/
    assertEquals(dstMap.size(), srcMap.size());
    // assertTrue(dstMap.values().toArray().equals(srcMap.values().toArray()));
    assertTrue(dstMap.keySet().equals(srcMap.keySet()));
    assertTrue(dstMap.entrySet().equals(srcMap.entrySet()));

    // Check non-empty clone behavior
    srcMap.put(KEY_1, VALUE_1);
    srcMap.put(KEY_2, VALUE_2);
    srcMap.put(KEY_3, VALUE_3);
    dstMap = (IdentityHashMap) srcMap.clone();
    assertNotNull(dstMap);
    assertEquals(dstMap.size(), srcMap.size());

    assertTrue(dstMap.keySet().equals(srcMap.keySet()));

    assertTrue(dstMap.entrySet().equals(srcMap.entrySet()));
}

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