Java Array Test - Sanfoundry

1. Which of these is an incorrect array declaration?

int arr[] = int [5] new

int arr[] = new int[5]

int [] arr = new int[5]

int arr[] = new int[5]

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

malloc

alloc

new malloc

new

3. 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);
            } 
    }

4. 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

i i i i i i i i i i

1 2 3 4 5 6 7 8 9 10

0 1 2 3 4 5 6 7 8 9 10

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

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

00000

value stored in arr[0]

Class name@ hashcode in hexadecimal form

6. Which of these is an incorrect Statement?

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

It is necessary to use new operator to initialize an array

Array can be initialized when they are declared

None of the mentioned

7. 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);
        } 
    }

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

Both Row and Column

Column

None of the mentioned

Row

9. 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++;
            }
        } 
    }

1 2 3 4 5 6 7 8 9 10

0 1 2 3 4 5 6 7 8 9

0 2 4 6 8

1 3 5 7 9

10. 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); 	
        } 
    }