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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.Object

  java.lang.Runnable

  java.lang.ThreadGroup

  java.lang.String

  java.lang.Thread

  Half-n-half Clue
 

2.

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

  (C) & (E)

  (E)

  (A) & (E)

  (B), (D) & (E)

  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;

  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
 

4.

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

  (A), (B), (D), (E) & (F)

  (D), (E) & (F)

  (B), (D), (E) & (F)

  (B), (D) & (F)

  (B), (D) & (E)

  Half-n-half Clue
 

5.

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

  (A), (B), (C), (E) & (F)

  (B), (E) & (F)

  (C), (E) & (F)

  (B), (C), (E) & (F)

  (B), (C) & (E)

  Half-n-half Clue
 

6.

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

  (A), (B), (D), (E) & (F)

  (A), (D) & (F)

  (A), (E) & (F)

  (A), (D) & (E)

  (D), (E) & (F)

  Half-n-half Clue
 

7.

Which of the following methods belong to the String class?

  substring()

  None of these

  length()

  All of these

  compareTo()

  equals()

  Half-n-half Clue
 


 
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