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Computer science Practice Questions & Answers

0 vote

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]); }}

Asked on by Guest | Votes 0

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]); }}

A).  The program has a compile error because new int[2<sp< label=""></sp<>

B).  The program has a runtime error because a[1

C).  a[1] is 0

D).  a[1] is 1

0 vote

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

Asked on by Guest | Votes 0

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

A).  The code has compile errors because the variable arr cannot be changed once it is assigned.

B).  The code has runtime errors because the variable arr cannot be changed once it is assigned.

C).  The code can compile and run fine. The second line assigns a new array to arr.

D).  The code has compile errors because we cannot assign a different size array to arr.

33 vote

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] + " "); }}

Asked on by Guest | Votes 33

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] + " "); }}

A).  1 2 3 4

B).  0 0 0 0

C).  1 2

D).  0 0

E).  None of these

16 vote

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] + " "); }}

Asked on by Guest | Votes 16

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] + " "); }}

A).  120 200 16

B).  120 200 14

C).  120 200 016

D).  016 is a compile error. It should be written as 16.

0 vote

Which of the following types of databases are the most common?

Asked on by Guest | Votes 0

Which of the following types of databases are the most common?

A).  Personal

B).  Workgroup

C).  Department

D).  Enterprise