Understanding Java Programming Basics

What is the main entry point of a Java application?

• public void main(String[] args)

• public static void main(String[] args)

• void main(String[] args)

• static void main(String[] args)

What keyword is used to define a class in Java?

• class

• define

• function

• object

How do you declare a variable in Java?

• To declare a variable in Java, use the syntax: ; = ;

• : ;

• : ;

• = ;

What is the purpose of the 'main' method in Java?

• The 'main' method is for creating user interfaces.

• The 'main' method handles exceptions in Java.

• The 'main' method is the entry point for Java applications.

• The 'main' method is used for defining classes.

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

• int

• boolean

• char

• string

What is the difference between 'int' and 'Integer' in Java?

• 'int' can hold null values while 'Integer' cannot.

• The difference is that 'int' is a primitive type and 'Integer' is a wrapper class.

• 'int' is used for floating-point numbers while 'Integer' is for whole numbers.

• 'int' is a class type while 'Integer' is a primitive type.

How do you create an object of a class in Java?

• ClassName objectName = new ClassName();

• new ClassName objectName;

• objectName = new ClassName();

• ClassName objectName = create ClassName();

What is a constructor in Java?

• A constructor is used to delete objects in Java.

• A constructor is a method that returns a value in Java.

• A constructor is a special method in Java used to initialize objects.

• A constructor is a type of variable in Java.

What is the purpose of the 'static' keyword in Java?

• The 'static' keyword allows instance-level access to variables and methods.

• The 'static' keyword allows class-level access to variables and methods without needing an instance.

• The 'static' keyword is used to create private variables only.

• The 'static' keyword is used to define abstract classes in Java.

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

• '==' can be used for comparing primitive types, while '.equals()' is only for objects.

• Both '==' and '.equals()' perform the same function in Java.

• '==' checks if two objects are identical in value, while '.equals()' checks if they are the same reference.

• The '==' operator checks if two references point to the same object, while '.equals()' checks if two objects are logically equal.