Examples of java.util.IdentityHashMap.containsValue()

java.util.IdentityHashMap.containsValue()
Tests whether the specified object reference is a value in this identity hash map. @param value value whose presence in this map is to be tested @return true if this map maps one or more keys to thespecified object reference @see #containsKey(Object)


    // another null key
    String anothervalue = "another value";
    result = map.put(null, anothervalue);
    assertTrue("testD can not find null key", map.containsKey(null));
    assertTrue("testD can not find a value with null key", map
        .containsValue(anothervalue));
    assertTrue("testD can not get value for null key",
        map.get(null) == anothervalue);
    assertTrue("testD put returned wrong value", result == value);

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    // remove a null key
    result = map.remove(null);
    assertTrue("testE remove returned wrong value", result == anothervalue);
    assertTrue("testE should not find null key", !map.containsKey(null));
    assertTrue("testE should not find a value with null key", !map
        .containsValue(anothervalue));
    assertNull("testE should not get value for null key",
        map.get(null));
  }

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    map.put("key1", "value1");
    map.put("key2", "value2");
    map.remove("key1");


    assertTrue("Did not remove key1", !map.containsKey("key1"));
    assertTrue("Did not remove the value for key1", !map
        .containsValue("value1"));


    assertTrue("Modified key2", map.get("key2") != null
        && map.get("key2") == "value2");
    assertNull("Modified null entry", map.get(null));

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      assertTrue("EntrySetIterator can not find entry ", entries
          .contains(entry));


      assertTrue("entry key not found in map", map.containsKey(entry
          .getKey()));
      assertTrue("entry value not found in map", map.containsValue(entry
          .getValue()));


      assertTrue("entry key not found in the keyset", keyset
          .contains(entry.getKey()));
      assertTrue("entry value not found in the valueset", valueset

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    Object result;


    // null key and null value
    result = map.put(null, null);
    assertTrue("testA can not find null key", map.containsKey(null));
    assertTrue("testA can not find null value", map.containsValue(null));
    assertNull("testA can not get null value for null key",
        map.get(null));
    assertNull("testA put returned wrong value", result);


    // null value

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    // null value
    String value = "a value";
    result = map.put(null, value);
    assertTrue("testB can not find null key", map.containsKey(null));
    assertTrue("testB can not find a value with null key", map
        .containsValue(value));
    assertTrue("testB can not get value for null key",
        map.get(null) == value);
    assertNull("testB put returned wrong value", result);

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    // a null key
    String key = "a key";
    result = map.put(key, null);
    assertTrue("testC can not find a key with null value", map
        .containsKey(key));
    assertTrue("testC can not find null value", map.containsValue(null));
    assertNull("testC can not get null value for key", map.get(key));
    assertNull("testC put returned wrong value", result);


    // another null key
    String anothervalue = "another value";

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    // another null key
    String anothervalue = "another value";
    result = map.put(null, anothervalue);
    assertTrue("testD can not find null key", map.containsKey(null));
    assertTrue("testD can not find a value with null key", map
        .containsValue(anothervalue));
    assertTrue("testD can not get value for null key",
        map.get(null) == anothervalue);
    assertTrue("testD put returned wrong value", result == value);

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    // remove a null key
    result = map.remove(null);
    assertTrue("testE remove returned wrong value", result == anothervalue);
    assertTrue("testE should not find null key", !map.containsKey(null));
    assertTrue("testE should not find a value with null key", !map
        .containsValue(anothervalue));
    assertNull("testE should not get value for null key",
        map.get(null));
  }

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    map.put("key1", "value1");
    map.put("key2", "value2");
    map.remove("key1");


    assertTrue("Did not remove key1", !map.containsKey("key1"));
    assertTrue("Did not remove the value for key1", !map
        .containsValue("value1"));


    assertTrue("Modified key2", map.get("key2") != null
        && map.get("key2") == "value2");
    assertNull("Modified null entry", map.get(null));

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