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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

  (A), (B), (D), (E) & (F)

  (B), (D) & (E)

  (B), (D) & (F)

  (D), (E) & (F)

  (B), (D), (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), (B), (D), (E) & (F)

  (A), (D) & (F)

  (A), (D) & (E)

  (A), (E) & (F)

  Half-n-half Clue
 

3.

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

  main()

  resume()

  run()

  start()

  init()

  Half-n-half Clue
 

4.

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

  java.lang.String

  java.lang.Object

  java.lang.Runnable

  java.lang.Thread

  java.lang.ThreadGroup

  Half-n-half Clue
 

5.

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)

  (A), (D) & (E)

  (C), (D) & (E)

  (A), (C) & (E)

  (A), (B) & (C)

  (D) & (E)

  Half-n-half Clue
 

6.

Which of the following methods belong to the String class?

  substring()

  None of these

  equals()

  All of these

  length()

  compareTo()

  Half-n-half Clue
 

7.

Suppose that s1 and s2 are two strings. Which of the statements or expressions are valid?
(A) String s3 = s1 + s2;
(B) String s3 = s1 - s2;
(C) s1 <= s2
(D) s1.compareTo(s2);
(E) int m = s1.length();

  (A), (C) & (E)

  (A), (D) & (E)

  (A), (B) & (C)

  (D) & (E)

  (C), (D) & (E)

  Half-n-half Clue
 


 
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