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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.

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), (B) & (C)

  (A), (D) & (E)

  (D) & (E)

  (C), (D) & (E)

  (A), (C) & (E)

  Half-n-half Clue
 

2.

What will be the content of array variable table after executing the following code?
for(int i = 0; i < 3; i + +)
for(int j = 0; j < 3; j + +)
if(j = i) table[i][j] = 1;
else table[i][j] = 0;

  0 0 1
0 1 0
1 0 0

  1 0 0
1 1 0
1 1 1

  0 0 0
0 0 0
0 0 0

  1 0 0
0 1 0
0 0 1

  Half-n-half Clue
 

3.

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)

  (B), (C), (E) & (F)

  (A), (B), (C), (E) & (F)

  (B), (E) & (F)

  Half-n-half Clue
 

4.

The methods wait() and notify() are defined in

  java.lang.Object

  java.lang.ThreadGroup

  java.lang.Runnable

  java.lang.Thread

  java.lang.String

  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)

  (C), (D) & (E)

  (A), (C), (D) & (E)

  (A), (B), (C) & (D)

  (D) & (E)

  Half-n-half Clue
 

6.

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

  (A), (D) & (F)

  (A), (E) & (F)

  (D), (E) & (F)

  (A), (D) & (E)

  (A), (B), (D), (E) & (F)

  Half-n-half Clue
 

7.

Which of the following methods belong to the String class?

  All of these

  substring()

  None of these

  compareTo()

  length()

  equals()

  Half-n-half Clue
 


 
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