Array in Java - Quiz

In Java arrays are

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

Which one of the following is a valid statement?

  • Achar[] c = new char();
  • Bchar[] c = new char[5];
  • Cchar[] c = new char(4);
  • D char[] c = new char[];

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);
        }
}

  • BCompilation error, arrays cannot be initialized to zero size.
  • CCompilation error, it is a.length() not a.length
  • DNone of the above

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

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]);
        }
}

  • AThe program has a compile error because new int[2]
  • BThe program has a runtime error because a[1]
  • Ca[1] is 0
  • D a[1] is 1

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};

What would be the result of attempting to compile and run the following code? 
public class HelloWorld{
      public static void main(String[] args){
            double[] x = new double[]{1, 2, 3};
            System.out.println("Value is " + x[1]);
      }
}

  • AThe program has a compile error because the syntax new double[]{1, 2, 3} is wrong and it should be replaced by {1, 2, 3}.
  • BThe program has a compile error because the syntax new double[]{1, 2, 3} is wrong and it should be replaced by new double[3]{1, 2, 3};
  • CThe program has a compile error because the syntax new double[]{1, 2, 3} is wrong and it should be replaced by new double[]{1.0, 2.0, 3.0};
  • D The program compiles and runs fine and the output

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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