Java Programming : Compilation and Execution: Multiple Choice

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1.
Which lines of the following will produce an error?
1. byte a1 = 2, a2 = 4, a3;
2. short s = 16;
3. a2 = s;
4. a3 = a1 * a2;
(The lines are numbered only for illustration in this question.)

Line 1 only
Line 1 and Line 4
Line 4 only
Line 3 and Line 4
Line 3 only

Half-n-half Clue

2.
To print the value of a variable "x" of type int, which of the following expressions can be used:
(A) System.out.println("x = " + x);
(B) System.out.println("x = " + String.valueOf(x));
(C) System.out.println("x = " + Integer.toString(x));
(D) System.out.println("x = " + (new Integer(x)).toString());

(A), (B), (C) and (D)
(C) and (D)
(B) and (D)
(B), (C) and (D)

Half-n-half Clue

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