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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.

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

  java.lang.Thread

  java.lang.Object

  java.lang.String

  java.lang.Runnable

  java.lang.ThreadGroup

  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;

  1 0 0
0 1 0
0 0 1

  0 0 0
0 0 0
0 0 0

  0 0 1
0 1 0
1 0 0

  1 0 0
1 1 0
1 1 1

  Half-n-half Clue
 

3.

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

  (C) & (E)

  (B), (D) & (E)

  (A) & (E)

  (E)

  Half-n-half Clue
 

4.

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) & (F)

  (B), (E) & (F)

  (A), (B), (C), (E) & (F)

  (B), (C) & (E)

  Half-n-half Clue
 

5.

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)

  (D) & (E)

  (C), (D) & (E)

  (A), (C) & (E)

  (A), (D) & (E)

  (A), (B) & (C)

  Half-n-half Clue
 

6.

Which of the following methods belong to the String class?

  All of these

  length()

  equals()

  substring()

  compareTo()

  None of these

  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")

  (D) & (E)

  (A), (B), (C) & (D)

  (A), (C), (D) & (E)

  (C), (D) & (E)

  (A), (B) & (C)

  Half-n-half Clue
 

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