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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

Your Performance  

1.

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

  (A)

  (C) & (E)

  (A) & (B)

  (C) & (D)

  None of the above

  Half-n-half Clue
 

2.

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

  XXX followed by YYY

  Error. Won't compile

  XXX

  YYY

  Half-n-half Clue
 

3.

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

  YYY

  Error. Won't compile

  XXX

  XXX followed by YYY

  Half-n-half Clue
 

4.

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
 

5.

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
 

6.

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)

  (B)

  (A)

  Half-n-half Clue
 

7.

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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