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Java Programming : Arrays and java.lang.* : Multiple Choice


Questions about arrays and classes in the java.lang package.

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Multiple choice

Your Performance  

1.

Which of the following contain error?
(A) int x[] = int[10];
(B) int[] y = new int[5];
(C) float d[] =

  (A), (D) & (F)

  (A), (E) & (F)

  (A), (B), (D), (E) & (F)

  (D), (E) & (F)

  (A), (D) & (E)

  Half-n-half Clue
 

2.

When we implement the Runnable interface, we must define the method

  run()

  init()

  resume()

  main()

  start()

  Half-n-half Clue
 

3.

Which of the following classes are available in the java.lang package?
(A) Stack
(B) Object
(C) Math
(D) Random
(E) String
(F) StringBuffer
(G) Vector

  (B), (C), (E) & (F)

  (B), (E) & (F)

  (B), (C) & (E)

  (C), (E) & (F)

  (A), (B), (C), (E) & (F)

  Half-n-half Clue
 

4.

Which of the following are the wrapper classes?
(A) Random
(B) Byte
(C) Vector
(D) Integer
(E) Short
(F) Double
(G) String

  (B), (D), (E) & (F)

  (A), (B), (D), (E) & (F)

  (B), (D) & (F)

  (D), (E) & (F)

  (B), (D) & (E)

  Half-n-half Clue
 

5.

Given the following code:
class Base { int x = 10; }
class Derived extends Base
{ int x = 20; }

Base b = new Base();
Derived d = new Derived ( );
Base bd = new Derived();
The statement
System.out.println(b.x + " " + d.x + " " + bd.x);
will produce the output

  10 20 10

  20 20 10

  10 20 20

  20 10 20

  Half-n-half Clue
 

6.

Which of the following statements are valid array declaration?
(A) int number();
(B) float average[];
(C) double[] marks;
(D) counter int[];

  (D)

  (B) & (C)

  (A) & (C)

  (A)

  Half-n-half Clue
 

7.

Given the class definitions
class Base
{
void display ()
{ System.out.println("Base"); }
}
class Derived extends Base
{
void display ()
{ System.out.println("Derived"); }
}
and objects
Base b = new Base();
Derived d = new Derived();
Base bd = new Derived;

then the print statements
System.out.print(b.display() + " ");
System.out.print(d.display() + " ");
System.out.print(bd.display() + " ");
System.out.println();
will display:

  Derived Derived Derived

  Base Derived Base

  Base Derived Derived

  Base Base Derived

  Half-n-half Clue
 


 
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