Questions and answers for exam Preparation

MCQs

Total Questions : 14 | Page 1 of 2 pages

Question 1. What will be the output?public class Test{ public static void main(String[] args){ int[] x = new int[3]; System.out.println("x[0] is " + x[0]); }}

The program has a runtime error because the array element x[0] is not defined.
The program has a compile error because the size of the array wasn't specified when declaring the array.
The program runs fine and displays x[0] is 0.
The program has a runtime error because the array elements are not initialized.

Discuss Question

Answer: Option C. -> The program runs fine and displays x[0] is 0.

Question 2. What is the output of the following code?public class Test{ public static void main(String args[]){ double[] myList = {1, 5, 5, 5, 5, 1}; double max = myList[0]; int indexOfMax = 0; for(int i = 1; i < myList.length; i++){ if(myList[i] > max){ max = myList[i]; indexOfMax = i; } } System.out.println(indexOfMax); }}

Discuss Question

Answer: Option D. -> 1

Question 3. In Java arrays are

None of these
objects
object references
primitive data type

Discuss Question

Answer: Option B. -> objects

Question 4. What is the result of compiling and running the following code?public class Test{ public static void main(String[] args){ int[] a = new int[0]; System.out.print(a.length); }}

None of these
0
Compilation error, arrays cannot be initialized to zero size.
Compilation error, it is a.length() not a.length

Discuss Question

Answer: Option B. -> 0

Question 5. Which one of the following is a valid statement?

char[] c = new char();
char[] c = new char[5];
char[] c = new char(4);
char[] c = new char[];

Discuss Question

Answer: Option B. -> char[] c = new char[5];

Question 6. What is output of the following code:public class Test{ public static void main(String[] args){ int[] x = {120, 200, 016 }; for(int i = 0; i < x.length; i++) System.out.print(x[i] + " "); }}

120 200 016
120 200 16
120 200 14
016 is a compile error. It should be written as 16.

Discuss Question

Answer: Option C. -> 120 200 14

Question 7. Determine output:public class Test{ public static void main(String[] args){ int[] x = {1, 2, 3, 4}; int[] y = x; x = new int[2]; for(int i = 0; i < x.length; i++) System.out.print(y[i] + " "); }}

1 2 3 4
None of these
0 0
1 2
0 0 0 0

Discuss Question

Answer: Option D. -> 1 2

Question 8. What will be the output?public class Test{ public static void main(String[] args){ int[] a = new int[4]; a[1] = 1; a = new int[2]; System.out.println("a[1] is " + a[1]); }}

The program has a compile error because new int[2
a[1] is 1
The program has a runtime error because a[1
a[1] is 0

Discuss Question

Answer: Option D. -> a[1] is 0

Question 9. Analyze the following code and choose the correct answer.int[] arr = new int[5];arr = new int[6];

The code has compile errors because the variable arr cannot be changed once it is assigned.
The code can compile and run fine. The second line assigns a new array to arr.
The code has compile errors because we cannot assign a different size array to arr.
The code has runtime errors because the variable arr cannot be changed once it is assigned.

Discuss Question

Answer: Option B. -> The code can compile and run fine. The second line assigns a new array to arr.

Question 10. When you pass an array to a method, the method receives ________ .