Java Programming Questions and Answers

1

Which of the following class is not included in java.lang?

a

Byte

b

Integer

c

Array

d

Class

correct answer c

2

Which of these is a process of converting a simple data type into a class?

a

type wrapping

b

type conversion

c

type casting

d

None of the above

correct answer a

3

Which of these is a super class of wrappers Double & Integer?

a

Long

b

digits

c

float

d

number

correct answer d

4

Which of these methods is used to check for infinitely large and small values?

a

isInfinite()

b

isNaN()

c

IsInfinite()

d

IsNaN()

correct answer a

5

What is the output of this program?

classisinfinite_output{
        publicstaticvoidmain(String args[]){
            Double d = new Double(1 / 0.);  
            boolean x = d.isInfinite();
            System.out.print(x);
        }
    }

a

0

b

1

c

True

d

False

correct answer c

6

What is the output of this program?

classisNaN_output{
        publicstaticvoidmain(String args[]){
            Double d = new Double(1 / 0.);  
            boolean x = d.isNaN();
            System.out.print(x);
        }
    }

a

0

b

1

c

True

d

False

correct answer d

7

What is the output of this program?

classbinary{
         publicstaticvoidmain(String args[]){
             int num = 17;
             System.out.print(Integer.toBinaryString(num));
        }
    }

a

1001

b

10011

c

11011

d

10001

correct answer d

8

Which of these method of class String is used to obtain length of String object?

a