Array in Java - Quiz

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.

Which of these operators is used to allocate memory to array variable in Java?
  • A malloc
  • B alloc
  • C new
  • D new malloc

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]
  • B The program has a runtime error because a[1]
  • C a[1] is 0
  • D a[1] is 1

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.

What will be the output of the program? 
public class Test{
      public static void main(String [] args){
            String s1 = args[1];
            String s2 = args[2];
            String s3 = args[3];
            String s4 = args[4];
            System.out.print(" args[2] = " + s2);
      }
}
and the command-line invocation is C:Java> java Test 1 2 3 4
  • A args[2] = 2
  • B args[2] = 3
  • C args[2] = null
  • D An exception is thrown at runtime.

In Java arrays are
  • A objects
  • B object references
  • C primitive data type
  • D None of the above

Which of the following is NOT true about Java arrays?

  • A Arrays can store only objects and not primitive types.
  • B Arrays have a fixed size.
  • C Arrays can be multidimensional.
  • D Elements of an array are accessed using an index.

When you pass an array to a method, the method receives ________ .
  • A A copy of the array.
  • B A copy of the first element.
  • C The reference of the array.
  • D The length of the array.

Which one of the following is a valid statement?
  • A char[] c = new char();
  • B char[] c = new char[5];
  • C char[] c = new char(4);
  • D char[] c = new char[];

What is the value of a[1] after the following code is executed? 
int[] a = {0, 2, 4, 1, 3};
for(int i = 0; i < a.length; i++)
a[i] = a[(a[i] + 3) % a.length];

  • A 0
  • B 1
  • C 2
  • D 3