Understanding Java Variables and Types

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

• 1

• 0

• -1

• null

Which of the following is a valid declaration of a float variable?

• float myVariable = '3.14';

• float myVariable : 3.14;

• float myVariable = 3.14;

• float myVariable = 3,14;

What data type is used to store a single character in Java?

• boolean

• int

• char

• string

What is the result of implicit casting from int to double?

• The result is a double representation of the integer.

• The result is an integer representation of the double.

• The result is a string representation of the integer.

• The result is a boolean value indicating success.

Which keyword is used to define a constant variable in Java?

• static

• final

• immutable

• constant

What is the size of a char data type in Java?

• 1 byte

• 2 bytes

• 4 bytes

• 8 bytes

Which of the following is an example of explicit casting?

• (int) 5.5

• (double) 5

• float(5.5)

• 5.5 as int

What will happen if you try to assign a double to an int without casting?

• The double will be automatically converted to an int.

• The program will crash immediately.

• A type error will occur.

• A warning will be displayed.

Which data type can hold the largest range of values?

• int

• double

• char

• float

What is the default value of a boolean variable in Java?

• 1

• false

• true

• null