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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), (D) & (E)

  (D), (E) & (F)

  (A), (B), (D), (E) & (F)

  (A), (E) & (F)

  (A), (D) & (F)

  Half-n-half Clue
 

2.

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)

  (A), (B) & (C)

  (A), (C) & (E)

  (A), (D) & (E)

  (C), (D) & (E)

  Half-n-half Clue
 

3.

Given the class definitions
class Base
{
void display ()
{ System.out.println("Base"); }
}
class Derived extends Base
{
void display ()
{ System.out.println("Derived"); }
}
and objects
Base b = new Base();
Derived d = new Derived();
Base bd = new Derived;

then the print statements
System.out.print(b.display() + " ");
System.out.print(d.display() + " ");
System.out.print(bd.display() + " ");
System.out.println();
will display:

  Base Derived Base

  Base Base Derived

  Derived Derived Derived

  Base Derived Derived

  Half-n-half Clue
 

4.

Which of the following methods belong to the String class?

  compareTo()

  None of these

  All of these

  substring()

  length()

  equals()

  Half-n-half Clue
 

5.

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)

  (A), (C), (D) & (E)

  (D) & (E)

  (C), (D) & (E)

  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), (D) & (E)

  (C), (D) & (E)

  (D) & (E)

  (A), (C) & (E)

  (A), (B) & (C)

  Half-n-half Clue
 

7.

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

  init()

  run()

  start()

  main()

  resume()

  Half-n-half Clue
 

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