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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.

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

  (C), (E) & (F)

  (B), (C), (E) & (F)

  (A), (B), (C), (E) & (F)

  (B), (C) & (E)

  (B), (E) & (F)

  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)

  (D) & (E)

  (A), (C) & (E)

  (A), (B) & (C)

  (A), (D) & (E)

  (C), (D) & (E)

  Half-n-half Clue
 

3.

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), (B) & (C)

  (C), (D) & (E)

  (A), (D) & (E)

  (D) & (E)

  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

  (B), (D), (E) & (F)

  (D), (E) & (F)

  (A), (B), (D), (E) & (F)

  (B), (D) & (E)

  (B), (D) & (F)

  Half-n-half Clue
 

5.

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

  (E)

  (A) & (E)

  (C) & (E)

  (B), (D) & (E)

  Half-n-half Clue
 

6.

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.

  (C), (D) & (E)

  (A), (B) & (D)

  (B), (D) & (E)

  (D) & (E)

  (A), (B), (D) & (E)

  Half-n-half Clue
 

7.

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)

  (A), (B) & (C)

  (D) & (E)

  (A), (C), (D) & (E)

  (C), (D) & (E)

  Half-n-half Clue
 

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