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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

Your Performance  

1.

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

  (A), (B), (D), (E) & (F)

  (A), (D) & (F)

  (D), (E) & (F)

  (A), (D) & (E)

  (A), (E) & (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();

  (A), (C) & (E)

  (A), (D) & (E)

  (C), (D) & (E)

  (D) & (E)

  (A), (B) & (C)

  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)

  (A), (C), (D) & (E)

  (D) & (E)

  Half-n-half Clue  
 

4.

Which of the following methods belong to the String class?

  substring()

  compareTo()

  equals()

  None of these

  All of these

  length()

  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

  20 10 20

  10 20 10

  20 20 10

  10 20 20

  Half-n-half Clue  
 

6.

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

  init()

  start()

  main()

  run()

  resume()

  Half-n-half Clue  
 

7.

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  
 


 
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