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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

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1.

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();

  (C), (D) & (E)

  (A), (C) & (E)

  (A), (B) & (C)

  (A), (D) & (E)

  (D) & (E)

  Half-n-half Clue
 

2.

Which of the following methods belong to the String class?

  All of these

  substring()

  length()

  compareTo()

  equals()

  None of these

  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)

  (C), (D) & (E)

  (A), (B) & (C)

  (D) & (E)

  (A), (C), (D) & (E)

  Half-n-half Clue
 

4.

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), (C), (E) & (F)

  (C), (E) & (F)

  (B), (E) & (F)

  (B), (C) & (E)

  Half-n-half Clue
 

5.

Which of the following statements are valid array declaration?
(A) int number();
(B) float average[];
(C) double[] marks;
(D) counter int[];

  (D)

  (A) & (C)

  (A)

  (B) & (C)

  Half-n-half Clue
 

6.

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

  java.lang.Object

  java.lang.Runnable

  java.lang.Thread

  java.lang.ThreadGroup

  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.

  (B), (D) & (E)

  (A), (B), (D) & (E)

  (A), (B) & (D)

  (D) & (E)

  (C), (D) & (E)

  Half-n-half Clue
 


 
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