Java Basics - Quiz Explanation

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1.	Which of the following methods forms the heart of a Java application and is called by the Java interpreter to actually run the application? Please select the best answer.
	A.	`begin()`
	B.	`init()`
	C.	`main()`
	The correct answer is C. The `main()` method forms the heart of a Java application and is called by the Java interpreter to actually run the application. There is no method named `begin()` in the Java API that is associated with applications. The `init()` method is used to initialize applets and plays no role in applications.

2.	Information entered on the command-line when you execute an application is referred to as: Please select the best answer.
	A.	Application initialization data
	B.	Command-line arguments
	C.	Application parameters
	The correct answer is B. Information entered on the command-line when you execute an application is referred to as command-line arguments. Although "application initialization data" and "application parameters" might accurately describe information entered on the command-line of an application, "command-line arguments" is the correct name of the information.

3.	Which one of the following devices is typically associated with the `System.in` object? Please select the best answer.
	A.	Keyboard
	B.	Mouse
	C.	Floppy drive
	The correct answer is A. The keyboard is typically associated with the `System.in` object. The mouse and floppy drive wouldn't work very well as standard input devices, and therefore would probably never be associated with the `System.in` object.

4.	Which one of the following methods is used with the `System.out` object to print information to standard output? Please select the best answer.
	A.	`printf()`
	B.	`println()`
	C.	`printLine()`
	The correct answer is B. The `println()` method is used with the System.out object to print information to standard output. `printf()` is the way to print information to standard output in C and is not supported in Java. There is no method named `printLine()` associated with the System.out object in the Java API.