The Anatomy 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 should 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.
Downloading IntelliJ IDEA
IntelliJ IDEA is absolutely free and it's more than enough for this course, so download it now.
Download IntelliJ IDEA
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.
Marsh has put together a comprehensive cheat sheet with summary notes that you can
download below this video.
IntelliJ 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.
Next, I'm going to explain how Java code gets executed under the hood.
IntelliJ uses the Java compiler to compile our code into a different format called Java
bytecode. This Java code is platform-independent, meaning it can run on Windows, Mac,
Linux, or any operating system that has a Java Runtime Environment. Java applications are
portable, or platform-independent.
Java was developed by James Gosling in 1995 at Sun Microsystems, which was later
acquired by Oracle in 2010. Currently, close to 9 million developers worldwide use Java.
About 3 billion mobile phones run Java, as well as 120 million TV sets and every Blu-ray
player. The average salary of a Java developer is just over $100,000 per year in the US.
Variables in Java
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 should 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.
Downloading IntelliJ IDEA
IntelliJ IDEA is absolutely free and it's more than enough for this course, so download it now.
Download IntelliJ IDEA
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.
Marsh has put together a comprehensive cheat sheet with summary notes that you can
download below this video.
IntelliJ 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.
Next, I'm going to explain how Java code gets executed under the hood.
IntelliJ uses the Java compiler to compile our code into a different format called Java
bytecode. This Java code is platform-independent, meaning it can run on Windows, Mac,
Linux, or any operating system that has a Java Runtime Environment. Java applications are
portable, or platform-independent.
Java was developed by James Gosling in 1995 at Sun Microsystems, which was later
acquired by Oracle in 2010. Currently, close to 9 million developers worldwide use Java.
About 3 billion mobile phones run Java, as well as 120 million TV sets and every Blu-ray
player. The average salary of a Java developer is just over $100,000 per year in the US.
Variables in Java
