Java Gate MCQs

What is the size of the 'int' data type in Java?

• 6 bytes

• 8 bytes

• 2 bytes

• 4 bytes

What is the purpose of 'System.out.println()' in Java?

• To read input from a file

• To calculate mathematical expressions

• To create a new object instance

• To print output to the console

How do you read input from the user in Java?

• Use the BufferedReader class from java.io package

• Use the Scanner class from java.util package

• Create a custom input reader class

• Directly access System.in stream

What is the default value of an 'int' variable in Java?

• null

• 1

• -1

• 0

What is the difference between '==' and '.equals()' in Java?

• '==' compares values, '.equals()' compares types

• '==' is used for strings, '.equals()' is used for integers

• '==' is a method, '.equals()' is an operator

• '==' compares reference, '.equals()' compares content

What is the output of '5 + 3 * 2' in Java?

• 10

• 15

• 7

• 11

What is the 'Scanner' class used for in Java?

• The 'Scanner' class in Java is used for taking user input from the console.

• The 'Scanner' class in Java is used for drawing graphics on the screen.

• The 'Scanner' class in Java is used for connecting to databases.

• The 'Scanner' class in Java is used for generating random numbers.

What is the correct way to declare a variable in Java?

• int num = 5;

• declare num as integer;

• variable num = 5;

• int num;

What is the purpose of 'System.in' in Java?

• System.in is used to define classes in Java

• System.in in Java is used to read input from the user during runtime.

• System.in is used to handle exceptions in Java

• System.in is used to print output in Java

What is the output of '10 / 3' in Java?

• 2

• 3

• 3.33

• 5