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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 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  
 

2.

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

  java.lang.ThreadGroup

  java.lang.Object

  java.lang.Thread

  java.lang.String

  java.lang.Runnable

  Half-n-half Clue  
 

3.

Which of the following methods belong to the String class?

  substring()

  All of these

  compareTo()

  equals()

  length()

  None of these

  Half-n-half Clue  
 

4.

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)

  (C) & (E)

  (B), (D) & (E)

  (A) & (E)

  Half-n-half Clue  
 

5.

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

  0 0 1
0 1 0
1 0 0

  0 0 0
0 0 0
0 0 0

  1 0 0
0 1 0
0 0 1

  Half-n-half Clue  
 

6.

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

  run()

  resume()

  main()

  init()

  start()

  Half-n-half Clue  
 

7.

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

  (A), (D) & (F)

  (A), (B), (D), (E) & (F)

  (A), (D) & (E)

  (A), (E) & (F)

  (D), (E) & (F)

  Half-n-half Clue  
 


 
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