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

  (B), (D), (E) & (F)

  (B), (D) & (E)

  (B), (D) & (F)

  (D), (E) & (F)

  (A), (B), (D), (E) & (F)

  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

  (A) & (E)

  (C) & (E)

  (E)

  (B), (D) & (E)

  Half-n-half Clue
 

3.

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

  java.lang.Thread

  java.lang.Object

  java.lang.Runnable

  java.lang.ThreadGroup

  java.lang.String

  Half-n-half Clue
 

4.

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

  (A), (D) & (E)

  (A), (D) & (F)

  (A), (E) & (F)

  (D), (E) & (F)

  (A), (B), (D), (E) & (F)

  Half-n-half Clue
 

5.

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

  start()

  init()

  resume()

  run()

  main()

  Half-n-half Clue
 

6.

Which of the following methods belong to the String class?

  length()

  substring()

  None of these

  compareTo()

  All of these

  equals()

  Half-n-half Clue
 

7.

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)

  (A), (B) & (C)

  (C), (D) & (E)

  (A), (C) & (E)

  (A), (D) & (E)

  Half-n-half Clue
 


 
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