Java Array Test - Sanfoundry

1. What will be the output of the following Java code?

 
    class array_output 
    {
        public static void main(String args[]) 
        {
            int array_variable [] = new int[10];
	    for (int i = 0; i < 10; ++i) 
            {
                array_variable[i] = i;
                System.out.print(array_variable[i] + " ");
                i++;
            }
        } 
    }

0 2 4 6 8

1 2 3 4 5 6 7 8 9 10

1 3 5 7 9

0 1 2 3 4 5 6 7 8 9

2. What will be the output of the following Java code?

    int arr[] = new int [5];
    System.out.print(arr);

value stored in arr[0]

00000

Class name@ hashcode in hexadecimal form

3. What will be the output of the following Java code?

 
    class array_output 
    {
        public static void main(String args[]) 
        {
            int array_variable[][] = {{ 1, 2, 3}, { 4 , 5, 6}, { 7, 8, 9}};
            int sum = 0;
            for (int i = 0; i < 3; ++i)
                for (int j = 0; j <  3 ; ++j)
                    sum = sum + array_variable[i][j];
            System.out.print(sum / 5);
        } 
    }

4. Which of these is necessary to specify at time of array initialization?

Column

None of the mentioned

Row

Both Row and Column

5. Which of these is an incorrect Statement?

It is necessary to use new operator to initialize an array

None of the mentioned

Array can be initialized using comma separated expressions surrounded by curly braces

Array can be initialized when they are declared

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

alloc

new

new malloc

malloc

7. What will be the output of the following Java code?

 
    class multidimention_array 
    {
        public static void main(String args[])
        {
            int arr[][] = new int[3][];
            arr[0] = new int[1];
            arr[1] = new int[2];
            arr[2] = new int[3];               
	    int sum = 0;
	    for (int i = 0; i < 3; ++i) 
	        for (int j = 0; j < i + 1; ++j)
                    arr[i][j] = j + 1;
	    for (int i = 0; i < 3; ++i) 
	        for (int j = 0; j < i + 1; ++j)
                    sum + = arr[i][j];
	    System.out.print(sum); 	
        } 
    }

8. Which of these is an incorrect array declaration?

int [] arr = new int[5]

int arr[] = new int[5]

int arr[] = int [5] new

int arr[] = new int[5]

9. What will be the output of the following Java code?

 
    class array_output 
    {
        public static void main(String args[]) 
        {
            char array_variable [] = new char[10];
	    for (int i = 0; i < 10; ++i) 
            {
                array_variable[i] = 'i';
                System.out.print(array_variable[i] + "");
            }
        } 
    }

i j k l m n o p q r

0 1 2 3 4 5 6 7 8 9 10

1 2 3 4 5 6 7 8 9 10

i i i i i i i i i i

10. What will be the output of the following Java code?

 
    class evaluate 
    {
        public static void main(String args[]) 
            {
	        int arr[] = new int[] {0 , 1, 2, 3, 4, 5, 6, 7, 8, 9};
	        int n = 6;
                n = arr[arr[n] / 2];
	        System.out.println(arr[n] / 2);
            } 
    }