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Java Programming : Compilation and Execution: Multiple Choice

Answer the following questions about Java syntax and mistakes which can cause compilation errors, as well as the output generated by sample programs.

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Multiple choice

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For the following class definition, which is a legal statement to construct an object of type Class1:
class Class1 extends Class2


  (C) & (E)

  (A) & (B)

  (C) & (D)

  None of the above

  Half-n-half Clue


What will be the output of the following program?
class Main1

  XXX followed by YYY

  Error. Won't compile



  Half-n-half Clue


What will be the output of the following program?
class Main2


  Error. Won't compile


  XXX followed by YYY

  Half-n-half Clue


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)

  (B), (C) and (D)

  (C) and (D)

  (B) and (D)

  Half-n-half Clue


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 3 only

  Line 3 and Line 4

  Line 1 only

  Line 4 only

  Line 1 and Line 4

  Half-n-half Clue


Examine the following code snippets to identify the legal loop constructs:
(A) for (int i = 22, int j = 0; i + j > 11; i = i-3, j++)

  (A) & (C)

  (A) & (D)



  Half-n-half Clue


Are there any errors in the following class definition?
abstract class Class1

  Class header definition is wrong

  Method definition is wrong

  Constructor needs to be defined

  No errors

  Half-n-half Clue

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