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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 contain error?
(A) int x[] = int[10];
(B) int[] y = new int[5];
(C) float d[] =

  (A), (E) & (F)

  (A), (D) & (E)

  (D), (E) & (F)

  (A), (D) & (F)

  (A), (B), (D), (E) & (F)

  Half-n-half Clue
 

2.

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

  (B), (C), (E) & (F)

  (B), (C) & (E)

  (A), (B), (C), (E) & (F)

  (B), (E) & (F)

  (C), (E) & (F)

  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), (C), (D) & (E)

  (A), (B) & (C)

  (D) & (E)

  Half-n-half Clue
 

4.

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)

  (C), (D) & (E)

  (A), (B) & (C)

  (D) & (E)

  (A), (D) & (E)

  Half-n-half Clue
 

5.

Given the following code:
class Base { int x = 10; }
class Derived extends Base
{ int x = 20; }

Base b = new Base();
Derived d = new Derived ( );
Base bd = new Derived();
The statement
System.out.println(b.x + " " + d.x + " " + bd.x);
will produce the output

  10 20 20

  20 10 20

  10 20 10

  20 20 10

  Half-n-half Clue
 

6.

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)

  (C), (D) & (E)

  (A), (D) & (E)

  (A), (C) & (E)

  (D) & (E)

  Half-n-half Clue
 

7.

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

  (A)

  (A) & (C)

  (B) & (C)

  (D)

  Half-n-half Clue
 

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