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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

  (A), (B), (C), (E) & (F)

  (B), (C), (E) & (F)

  (B), (E) & (F)

  (B), (C) & (E)

  (C), (E) & (F)

  Half-n-half Clue
 

2.

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

  (D)

  (B) & (C)

  (A) & (C)

  (A)

  Half-n-half Clue
 

3.

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

  (D), (E) & (F)

  (B), (D) & (F)

  (B), (D), (E) & (F)

  (A), (B), (D), (E) & (F)

  (B), (D) & (E)

  Half-n-half Clue
 

4.

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), (B) & (C)

  (A), (D) & (E)

  (A), (C) & (E)

  (D) & (E)

  (C), (D) & (E)

  Half-n-half Clue
 

5.

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();

  (D) & (E)

  (C), (D) & (E)

  (A), (D) & (E)

  (A), (C) & (E)

  (A), (B) & (C)

  Half-n-half Clue
 

6.

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

  main()

  run()

  init()

  start()

  resume()

  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)

  (C), (D) & (E)

  (A), (B), (C) & (D)

  (D) & (E)

  (A), (C), (D) & (E)

  Half-n-half Clue
 


 
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