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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.

The methods wait() and notify() are defined in

  java.lang.ThreadGroup

  java.lang.Runnable

  java.lang.String

  java.lang.Object

  java.lang.Thread

  Half-n-half Clue  
 

2.

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;

  1 0 0
1 1 0
1 1 1

  1 0 0
0 1 0
0 0 1

  0 0 1
0 1 0
1 0 0

  0 0 0
0 0 0
0 0 0

  Half-n-half Clue  
 

3.

Which of the following statements are true?
(A) A Java monitor must either extend Thread or implement Runnable.
(B) The sleep() method should be enclosed in try ... catch block.
(C) The yield() method should be enclosed in try ... catch block.
(D) A thread can be temporarily suspended from running by using the wait() method.
(E) A suspended thread using suspend() method can be revived using the resume() method.

  (B), (D) & (E)

  (A), (B) & (D)

  (A), (B), (D) & (E)

  (C), (D) & (E)

  (D) & (E)

  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) & (F)

  (A), (B), (C), (E) & (F)

  (B), (E) & (F)

  (C), (E) & (F)

  (B), (C) & (E)

  Half-n-half Clue  
 

5.

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

  (B), (D) & (F)

  (D), (E) & (F)

  (A), (B), (D), (E) & (F)

  (B), (D), (E) & (F)

  (B), (D) & (E)

  Half-n-half Clue  
 

6.

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 Derived Base

  Base Base Derived

  Derived Derived Derived

  Base Derived Derived

  Half-n-half Clue  
 

7.

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

  (E)

  (A) & (E)

  (C) & (E)

  (B), (D) & (E)

  Half-n-half Clue  
 


 
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