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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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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());

  (B), (C) and (D)

  (C) and (D)

  (A), (B), (C) and (D)

  (B) and (D)

  Half-n-half Clue


Which javadoc tag is used to denote a comment for a method parameter?






  Half-n-half Clue


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


Which of the following command lines options generates documentation for all classes and methods?






  Half-n-half Clue


Determine the output when the value of x is zero:
if(x >= 0)
if(x > 0)
System.out.println("x is positive");
System.out.println("x is negative");

  "x is positive" and "x is negative"

  "x is negative"

  None of these

  "x is positive"

  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) & (D)

  (A) & (C)

  Half-n-half Clue


The control expression in an "if" statement must be:

  an expression with either the type boolean or integer with value 0 or 1

  an expression with type boolean

  an expression with either the type boolean or integer

  an expression with type integer

  Half-n-half Clue

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