Java Programming Practice Test 1

1. Which of these is long data type literal?

ABCDEFG

0x99fffa

99671246

0x99fffL

2. How to format date from one form to another?

SimpleDateFormat

DateConverter

SimpleFormat

DateFormat

3. Which of these can be returned by the operator &?

Integer

Boolean

Integer or Boolean

Character

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

    class evaluate 
    {
        public static void main(String args[]) 
        {
            int a[] = {1,2,3,4,5};
	    int d[] = a;
	    int sum = 0;
	    for (int j = 0; j < 3; ++j)
                sum += (a[j] * d[j + 1]) + (a[j + 1] * d[j]);
	    System.out.println(sum);
        } 
    }

5. Which class is a library of functions to perform arithmetic operations of BigInteger and BigDecimal?

BigLib

BigContext

MathContext

MathLib

6. What is the type of variable 'b' and 'd' in the following Java snippet?

int a[], b;
int []c, d;

'b' is int variable; 'd' is int array

'b' and 'd' are int

'b' and 'd' are arrays of type int

'd' is int variable; 'b' is int array

7. 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

3 & 2

1, 2, 3 & 4

1 & 4

8. Decrement operator, −−, decreases the value of variable by what number?

9. How to convert a String to a Date object?

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-mm-dd");
new Date().parse();

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-mm-dd");
sdf.format(new Date());

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-mm-dd");
sdf.parse(new Date());

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-mm-dd");
new Date().format();

10. BigDecimal is a part of which package?

java.io

java.util

java.lang

java.math