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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.

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
 

2.

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

  XXX

  YYY

  XXX followed by YYY

  Error. Won't compile

  Half-n-half Clue
 

3.

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)

  (A), (B), (C) and (D)

  (C) and (D)

  (B) and (D)

  Half-n-half Clue
 

4.

Consider the following code:
class NewString extends java.lang.String

  Results in error because the class is not declaredpublic

  Compiles successfully

  Results in error because java.lang.String isfinal

  Results in error because String isabstract

  Results in error because class body is not defined

  Half-n-half Clue
 

5.

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

  an expression with type boolean

  an expression with type integer

  an expression with either the type boolean or integer

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

  Half-n-half Clue
 

6.

What is java_g used for?

  Executing a class with optimization turned off

  None of these

  To provide information about deprecated methods

  Using the jdb tool

  Half-n-half Clue
 

7.

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

  -encoding

  -protected

  -public

  -verbose

  -private

  Half-n-half Clue
 


 
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