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The tests on java.util.EnumMap use the following code pattern: --------------------------------------------------------- Object [] array = { Suit.CLUBS, null, Suit.DIAMONDS, "val1", Suit.HEARTS, "val2", Suit.SPADES, new Integer(1) }; ... EnumMap map = new EnumMap(Suit.class); ... for (int j = 0; j < i; j += 2) { map.put(array[j], array[j + 1]); // * } --------------------------------------------------------- The line marked (*) cause compilation error since JDK7 b55 with the output: --------------------------------------------------------- minitest.java:15: cannot find symbol map.put(array[0], array[1]); ^ symbol: method put(java.lang.Object,java.lang.Object) location: class java.util.EnumMap ---------------------------------------------------------