Given TripleThis.java:

Compiling TripleThis.java gives this compiler warning:
Note: TripleThis.java uses unchecked or unsafe operations.
Which two replacements done together remove this compiler warning?

• A.Replace line 9 with function<Integer> tripler = x-> - { return (Integer) X * 3 ; }.
• B.Replace line 12 with public static <T> void printValue (Function<T, T> f, T num ) {,
• C.Replace line 12 with public static void printValue function<Integer> f, int num) {.
• D.Replace line 12 with public static int printValue function<Integer, Integer>, f, T num {.
• E.Replace line 9 with function<Integer>, Integer> = X -> { return (integer) x * 3; }.

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Given this enum declaration:

Examine this code:
System.out.println(Alphabet.getFirstLetter());
What code should be written at line 3 to make this code print A?

• A.static String getFirstLetter() { return Alphabet.values()[1].toString(); }
• B.static String getFirstLetter() { return A.toString(); }
• C.String getFirstLetter() { return A.toString(); }
• D.final String getFirstLetter() { return A.toString(); }

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Given:

What is the result?

• A.Dr. Who
• B.Dr. Null
• C.An exception is thrown at runtime.
• D.null

Correct Answer: D

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Given:

What is the output?

• A.300
• B.Exception
• C.200
• D.100

Correct Answer: A

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Given:

Which two are correct? (Choose two.)

• A.The output will be exactly 2 1 3 4 5.
• B.The program prints 1 4 2 3, but the order is unpredictable.
• C.Replacing forEach() with forEachOrdered(), the program prints 2 1 3 4 5, but the order is unpredictable.
• D.Replacing forEach() with forEachOrdered(), the program prints 1 2 3 4 5.
• E.Replacing forEach() with forEachOrdered(), the program prints 2 1 3 4 5.

Correct Answer: B,D

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