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SCJP 5.0 Mock Exam -3

10) What will be the output of the following program?

package scjp5_0.chap03;
public class Ques09 {
	public static void main(String[] args) {

		Integer a = null;
		a = new Integer(10);

		int b = 20;
		a = b;

		a = 30;
		System.out.println(a++);

		short s = 100;
		a = s;
		System.out.println(a--);
	}
}

1. The program won't compile.
2. The program will throw a run-time exception.
3. The program will output '31 100'
4. The program will output '31 99'

Answer:

10) a.
The program won't compile since an explicit cast is needed for the assignment of short to an Integer object.

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