Examples of java.util.Map.keySet()

java.util.Map.keySet()
Returns a {@link Set} view of the keys contained in this map.The set is backed by the map, so changes to the map are reflected in the set, and vice-versa. If the map is modified while an iteration over the set is in progress (except through the iterator's own remove operation), the results of the iteration are undefined. The set supports element removal, which removes the corresponding mapping from the map, via the Iterator.remove, Set.remove, removeAll, retainAll, and clear operations. It does not support the add or addAll operations. @return a set view of the keys contained in this map

    collection.add(new DomainClass(4));


    Map map = handler.createMap(collection);
    assert map instanceof HashMap;


    Object firstKey = map.keySet().iterator().next();
    assert firstKey instanceof Integer;


    Object value = map.get(firstKey);
    assert value instanceof DomainClass;

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    collection.add(new DomainClass());
    collection.add(new DomainClass());


    Map map = handler.createMap(collection);
    assert map.size() == 1;
    assert map.keySet().iterator().next().equals(0);
  }


  @Test
  public void testGetPropertyAsMap()
  {

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    Map map = handler.getPropertyAsMap(collection);


    assert map.size() == 3;
    assert map instanceof HashMap;


    Object firstKey = map.keySet().iterator().next();
    assert firstKey instanceof Integer;


    Object value = map.get(firstKey);
    assert value instanceof DomainClass;
  }

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    Date sqlDate = Date.valueOf("1999-12-12");
    simpleForm.setDateValue("1999-12-12");
    ValidationInfo vi = new ValidationInfo(validators, handler, new DefaultConversionHandler());


    expect(validators.keySet()).andReturn(keys);
    expect(keys.iterator()).andReturn(iterator);
    expect(iterator.hasNext()).andReturn(true);
    expect(iterator.next()).andReturn(op);
    expect(validators.get(op)).andReturn(methodValidators);
    expect(methodValidators.getRequiresConversion()).andReturn(true);

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    Date sqlDate = Date.valueOf("1999-12-12");
    simpleForm.setDateValue("1999-12-12");
    ValidationInfo vi = new ValidationInfo(validators, handler, new DefaultConversionHandler());


    expect(validators.keySet()).andReturn(keys);
    expect(keys.iterator()).andReturn(iterator);
    expect(iterator.hasNext()).andReturn(true);
    expect(iterator.next()).andReturn(op);
    expect(validators.get(op)).andReturn(methodValidators);
    expect(methodValidators.getRequiresConversion()).andReturn(true);

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    MethodValidators methodValidators = createStrictMock(MethodValidators.class);
    Converter converter = createStrictMock(Converter.class);


    ValidationInfo vi = new ValidationInfo(validators, handler, new DefaultConversionHandler());


    expect(validators.keySet()).andReturn(keys);
    expect(keys.iterator()).andReturn(iterator);
    expect(iterator.hasNext()).andReturn(true);
    expect(iterator.next()).andReturn(op);
    expect(validators.get(op)).andReturn(methodValidators);
    expect(methodValidators.getRequiresConversion()).andReturn(true);

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    MethodValidators methodValidators = createStrictMock(MethodValidators.class);
    Converter converter = createStrictMock(Converter.class);


    ValidationInfo vi = new ValidationInfo(validators, handler, new DefaultConversionHandler());


    expect(validators.keySet()).andReturn(keys);
    expect(keys.iterator()).andReturn(iterator);
    expect(iterator.hasNext()).andReturn(true);
    expect(iterator.next()).andReturn(op);
    expect(validators.get(op)).andReturn(methodValidators);
    expect(methodValidators.getRequiresConversion()).andReturn(true);

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    return out();
  }
  
  protected void assignAll(Object bean) {
    Map p = getBeanProperties(bean);
    Iterator i = p.keySet().iterator();
    while (i.hasNext()) {
      String key = (String) i.next(); 
      assign(key.toUpperCase(), "" + p.get(key));
    }
  }

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        map.put("Two", "Two");
        map.put(null, "Three");
        assertEquals("Three", (String) map.get(null));
        map.put(null, "Four");
        assertEquals("Four", (String) map.get(null));
        Set keys = map.keySet();
        assertTrue(keys.contains("one"));
        assertTrue(keys.contains("two"));
        assertTrue(keys.contains(null));
        assertTrue(keys.size() == 3);
    }

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        map.put("one", "Three");
        map.put(null, "Four");
        map.put(new Integer(20), "Five");
        Map caseInsensitiveMap = new CaseInsensitiveMap(map);
        assertTrue(caseInsensitiveMap.size() == 4); // ones collapsed
        Set keys = caseInsensitiveMap.keySet();
        assertTrue(keys.contains("one"));
        assertTrue(keys.contains("two"));
        assertTrue(keys.contains(null));
        assertTrue(keys.contains(Integer.toString(20)));
        assertTrue(keys.size() == 4);

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