Java Programming Mock Test 1

10%

Question 1 of 10

1. What is the numerical range of a char data type in Java?

-128 to 127

0 to 65535

0 to 32767

0 to 256

Question 1 of 10

Question 2 of 10

2. What is the range of short data type in Java?

-2147483648 to 2147483647

-128 to 127

None of the mentioned

-32768 to 32767

Question 2 of 10

Question 3 of 10

3. How to copy contents of array?

Collection.copy()

Array.copy()

Arrays.copy()

System.arrayCopy()

Question 3 of 10

Question 4 of 10

4. What will be the output of the following Java program?

    class leftshift_operator 
    {
        public static void main(String args[]) 
        {        
             byte x = 64;
             int i;
             byte y; 
             i = x << 2;
             y = (byte) (x << 2)
             System.out.print(i + " " + y);
        } 
    }

0 64

256 0

0 256

64 0

Question 4 of 10

Question 5 of 10

5. How to sort an array?

Array.sort()

Collection.sort()

System.sort()

Arrays.sort()

Question 5 of 10

Question 6 of 10

6. Which of these is an incorrect string literal?

"Hello
world"

"Hello\nWorld"

"Hello World"

"\"Hello World\""

Question 6 of 10

Question 7 of 10

7. If an expression contains double, int, float, long, then the whole expression will be promoted into which of these data types?

long

float

double

int

Question 7 of 10

Question 8 of 10

8. Which operator is used to invert all the digits in a binary representation of a number?

>>>

<<<

Question 8 of 10

Question 9 of 10

9. 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); 	
        } 
    }

Question 9 of 10

Question 10 of 10

10. With x = 0, which of the following are legal lines of Java code for changing the value of x to 1?

   1. x++;
   2. x = x + 1;
   3. x += 1;
   4. x =+ 1;

1, 2, 3 & 4

1 & 4

3 & 2

1, 2 & 3

Question 10 of 10