Core Java Quiz

what is size of int in Java?

• 2 bytes

• 4 bytes

• 6 bytes

• 8 bytes

what is size of long int in Java?

• 2 bytes

• 4 bytes

• 6 bytes

• 8 bytes

what is size of char in Java?

• 2 bytes

• 4 bytes

• 6 bytes

• 1 bytes

String in a Java is primitive (built-in) data type or class?

• data type

• class

What size will be required to store value 324.98 in Java?

• 2

• 3

• 6

• 8

Which of these can not be used for a variable name in Java and any other programming languages?

• identifier

• keyword

• identifier & keyword

• none of the mentioned

Import java.lang.*;

class Rectangle

{

int l,b,a;

a=l*b;

void fun()

{

l=10;

b=20;

system.out.println("Area = ", a);

}

}

Identify errors in above program segment.

• Error in import line and Error in println line both

• Error in import line

• Error in println line

• No error at all

Which of the following rule is INCORRECT in Java?

• Class should not be end with semi-colon

• Constants to be written in CAPITAL letters

• main() should be inside the class

• We can write Java program without using class

Which of these access specifiers must be used for main() method in Java?

• private

• public

• protected

• none of the mentioned

Which of the following is a valid declaration of an object of class Box?

• Box obj = new Box();

• Box obj = new Box;

• obj = new Box();

• new Box obj;