Syvum Home Page
  NY Regents Exam   Teasers   IQ Tests   Chemistry   Biology   GK   C++   Recipes   Search

Home > Quiz Games > Java Programming >

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


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

Formats Info Page Worksheet / Test Paper Quiz Review
Multiple choice

Your Performance  

1.

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

  (A)

  (D)

  (B) & (C)

  (A) & (C)

  Half-n-half Clue
 

2.

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 Base Derived

  Base Derived Base

  Base Derived Derived

  Half-n-half Clue
 

3.

What will be the content of array variable table after executing the following code?
for(int i = 0; i < 3; i + +)
for(int j = 0; j < 3; j + +)
if(j = i) table[i][j] = 1;
else table[i][j] = 0;

  0 0 0
0 0 0
0 0 0

  1 0 0
0 1 0
0 0 1

  0 0 1
0 1 0
1 0 0

  1 0 0
1 1 0
1 1 1

  Half-n-half Clue
 

4.

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)

  (B), (C), (E) & (F)

  (C), (E) & (F)

  (A), (B), (C), (E) & (F)

  (B), (E) & (F)

  Half-n-half Clue
 

5.

Given the code
String s1 = "yes";
String s2 = "yes";
String s3 = new String(s1);

Which of the following would equate to true?
(A) s1 == s2
(B) s1 = s2
(C) s3 == s1
(D) s1.equals(s2)
(E) s3.equals(s1)

  (D) & (E)

  (C), (D) & (E)

  (A), (C) & (E)

  (A), (B) & (C)

  (A), (D) & (E)

  Half-n-half Clue
 

6.

Consider the following code
int number[] = new int[5]; After execution of this statement, which of the following are true?
(A) number[0] is undefined
(B) number[5] is undefined
(C) number[4] is null
(D) number[2] is 0
(E) number.length() is 5

  (A) & (E)

  (C) & (E)

  (E)

  (B), (D) & (E)

  Half-n-half Clue
 

7.

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

  resume()

  start()

  init()

  run()

  main()

  Half-n-half Clue
 


 
12 more pages in Java Programming


Contact Info © 1999-2014 Syvum Technologies Inc. Privacy Policy Disclaimer and Copyright
Previous
-
Next
-