Array in Java - Quiz

In Java arrays are

  • Aobjects
  • Bobject references
  • Cprimitive data type
  • DNone of the above

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]);
        }
}

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

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] + " ");
        }
}

  • A120 200 16
  • B120 200 14
  • C120 200 016
  • D016 is a compile error. It should be written as 16.

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] + " ");
        }
}

  • A1 2 3 4
  • B 0 0 0 0
  • C1 2
  • D0 0

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

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

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

  • AA copy of the array.
  • BA copy of the first element.
  • CThe reference of the array.
  • DThe length of the array.

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

  • Aargs[2] = 2
  • Bargs[2] = 3
  • C args[2] = null
  • DAn exception is thrown at runtime.

Which will legally declare, construct, and initialize an array?

  • Aint [] myList = {};
  • Bint [] myList = (5, 8, 2);
  • Cint myList [] [] = {4,9,7,0};
  • Dint myList [] = {4, 3, 7};

Which of these operators is used to allocate memory to array variable in Java?

  • Amalloc
  • B alloc
  • Cnew
  • D new malloc

Which of the following is NOT true about Java arrays?

  • AArrays can store only objects and not primitive types.
  • BArrays have a fixed size.
  • CArrays can be multidimensional.
  • D Elements of an array are accessed using an index.

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