Java Programming Quiz 2

What is the correct file extension for a Java source file?

• .class

• .java

• .exe

• .jar

Which of the following is true about writing Java code?

• Java is case-insensitive

• Class names must match the filename

• Java allows multiple public classes in a single file

• A Java program must have a function named run()

What is the correct naming convention for Java class names?

• camelCase

• UPPERCASE

• PascalCase

• snake_case

Which of the following is the correct main method declaration in Java?

• public static void Main(String args[])

• static public void main(String[] args)

• public void static main(String args)

• public static void main()

Which of the following is NOT a valid identifier in Java?

• _myVariable

• $myVar

• 123abc

• myVar123

Which statement about Java identifiers is correct?

• Identifiers can start with a digit

• Identifiers can use special symbols like @ and #

• Identifiers are case-sensitive

• Java has a predefined list of identifiers

Which of the following is the size of int in Java?

• 2 bytes

• 4 bytes

• 8 bytes

• Depends on the system

What is the default data type of a decimal number in Java?

• int

• float

• double

• long

Which of the following data types has the smallest size?

• float

• byte

• int

• long

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

• 2 bytes

• 4 bytes

• 8 bytes

• 16 bytes