Java SE 8 Programmer II Exam Answer: BiFunction Result

C.

The code fragment defines a BiFunction object named val which takes in two arguments, an Integer and a Double, and returns an Integer. The lambda expression assigned to val sums the two arguments and returns their integer sum.

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BiFunction<Integer, Double, Integer> val = (t1, t2) -> t1 + t2; 

When val.apply(10, 10.5) is called, the apply method of the BiFunction object val is invoked with the arguments 10 and 10.5. Since 10.5 is a Double value and not an Integer, it will be automatically unboxed to a double primitive value. The apply method then adds 10 and 10.5 (which is equal to 20.5) and returns the result as an Integer.

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System.out.println(val.apply(10, 10.5)); // Output: 20 

Therefore, the correct answer is (A) 20.