A Java Applet is a program that runs over the Internet. It is deprecated, but is a simple way to learn about writing code that is not just executed sequentially.
An Applet is run by a plug-in to your browser, and that code knows when to call certain methods in your Applet code.
Note: you do not write constructors for your Applet. The code that runs it knows to call the default constructor.
If you want code to execute when the Applet starts up, you put that code in the init() method.
If you want code to execute when the Applet decides it needs to paint itself, you put that code into the paint() method.
Unlinke the code we've seen so far, where each line of code is execute only when your program executes the code (line-by-line),
and must explicitly call a method for it to execute, Applet code automatically calls your methods for you.
Also note that an Applet is not a console application, which means you cannot prompt for intput, but would write a graphcial interface (form) to allow the user to type in data.