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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 valid array declaration?
(A) int number();
(B) float average[];
(C) double[] marks;
(D) counter int[];

  (A) & (C)

  (B) & (C)

  (A)

  (D)

  Half-n-half Clue
 

2.

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)

  (C), (D) & (E)

  (D) & (E)

  (A), (B) & (C)

  (A), (C) & (E)

  (A), (D) & (E)

  Half-n-half Clue
 

3.

Given the code
String s = new String("abc");
Which of the following calls are valid?
(A) s.trim()
(B) s.replace('a', 'A')
(C) s.substring(3)
(D) s.toUppercase()
(E) s.setCharAt(1,'A')
(F) s.append("xyz")

  (A), (B) & (C)

  (D) & (E)

  (A), (C), (D) & (E)

  (C), (D) & (E)

  (A), (B), (C) & (D)

  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

  (B), (D) & (E)

  (C) & (E)

  (A) & (E)

  (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

  (A), (B), (D), (E) & (F)

  (B), (D) & (F)

  (B), (D), (E) & (F)

  (B), (D) & (E)

  (D), (E) & (F)

  Half-n-half Clue
 

6.

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

  java.lang.Runnable

  java.lang.Object

  java.lang.ThreadGroup

  java.lang.Thread

  java.lang.String

  Half-n-half Clue
 

7.

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.

  (D) & (E)

  (A), (B) & (D)

  (B), (D) & (E)

  (A), (B), (D) & (E)

  (C), (D) & (E)

  Half-n-half Clue
 


 
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