The Definition of a Java Program
In this Java tutorial, we'll be looking at the basics of a Java program. The
smallest building block in Java programs are functions. If a function is a
block of code that performs a task, think of the buttons on the remote
control of your TV. Every Java program should have at least one function
and that function is called main .
Writing Java Code
After the parentheses, we have a pair of curly braces and inside these
braces, we write the actual Java code. Every Java program s hould have at
least one function and that function is called main . So, main is the entry
point to our programs. Whenever we execute a Java program,
the main function gets called and the code inside this function gets
executed.
Java Class
A class is a container for related methods, so we use classes to organize
our code. By the same token, we have a concept called package, and we
use a package to group related classes.
As our applications grow, we're going to end up with hundreds or even
thousands of classes, so we should properly organize these classes into
packages. The base package for a Java project is the domain name of your
company in reverse.
The code editor might look a little bit intimidating at first, but trust me it's
really easy and you're going to learn about it throughout this course. For
now, just type a base package for your project; it can be your name or
whatever, it doesn't really matter.
IDE is building our application and we can see the result in this little
terminal window. So, here's our "Hello World" message. That was our first
Java program.
In this Java tutorial, we'll be looking at the basics of a Java program. The
smallest building block in Java programs are functions. If a function is a
block of code that performs a task, think of the buttons on the remote
control of your TV. Every Java program should have at least one function
and that function is called main .
Writing Java Code
After the parentheses, we have a pair of curly braces and inside these
braces, we write the actual Java code. Every Java program s hould have at
least one function and that function is called main . So, main is the entry
point to our programs. Whenever we execute a Java program,
the main function gets called and the code inside this function gets
executed.
Java Class
A class is a container for related methods, so we use classes to organize
our code. By the same token, we have a concept called package, and we
use a package to group related classes.
As our applications grow, we're going to end up with hundreds or even
thousands of classes, so we should properly organize these classes into
packages. The base package for a Java project is the domain name of your
company in reverse.
The code editor might look a little bit intimidating at first, but trust me it's
really easy and you're going to learn about it throughout this course. For
now, just type a base package for your project; it can be your name or
whatever, it doesn't really matter.
IDE is building our application and we can see the result in this little
terminal window. So, here's our "Hello World" message. That was our first
Java program.
