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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 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), (C) & (E)

  (C), (E) & (F)

  (A), (B), (C), (E) & (F)

  (B), (E) & (F)

  Half-n-half Clue
 

2.

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

  (D), (E) & (F)

  (A), (D) & (E)

  (A), (E) & (F)

  (A), (B), (D), (E) & (F)

  (A), (D) & (F)

  Half-n-half Clue
 

3.

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

  (D), (E) & (F)

  (B), (D) & (F)

  (B), (D), (E) & (F)

  (A), (B), (D), (E) & (F)

  (B), (D) & (E)

  Half-n-half Clue
 

4.

Which of the following methods belong to the String class?

  substring()

  compareTo()

  equals()

  All of these

  length()

  None of these

  Half-n-half Clue
 

5.

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:

  Base Base Derived

  Base Derived Base

  Derived Derived Derived

  Base Derived Derived

  Half-n-half Clue
 

6.

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

  start()

  resume()

  run()

  init()

  main()

  Half-n-half Clue
 

7.

Given the code
String s = new String("abc");
Which of the following calls are valid?
(A) s.trim()
(B) s.replace('a', 'A')
(C) s.substring(3)
(D) s.toUppercase()
(E) s.setCharAt(1,'A')
(F) s.append("xyz")

  (A), (B) & (C)

  (C), (D) & (E)

  (A), (C), (D) & (E)

  (A), (B), (C) & (D)

  (D) & (E)

  Half-n-half Clue
 


 
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