Mosh is a software engineer with over two decades of experience
and has taught over 3 million people how to code. He has
designed this course for anyone who wants to learn Java. If you're
a beginner, don't worry - Mosh promises to make Java super
simple and hold your hand through this course. He hopes you'll
stick around and learn this beautiful and powerful programming
language.
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.
This course is the first part of my complete four-part Java series.
Each part is about three to four hours long, so you can easily
complete it in a day or two. The first part will give you a solid
foundation on how to start programming in Java. In the second
part, we'll talk about Object-Oriented Programming, which is a
style used in most, if not all, Java applications. The third part will
cover Core Java APIs, or Application Programming Interfaces.
Once you learn all this, I'm going to give you a project. You're
going to build a mortgage calculator on your own, so make sure
to pay great attention to all the materials. Make sure to use most
and has taught over 3 million people how to code. He has
designed this course for anyone who wants to learn Java. If you're
a beginner, don't worry - Mosh promises to make Java super
simple and hold your hand through this course. He hopes you'll
stick around and learn this beautiful and powerful programming
language.
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.
This course is the first part of my complete four-part Java series.
Each part is about three to four hours long, so you can easily
complete it in a day or two. The first part will give you a solid
foundation on how to start programming in Java. In the second
part, we'll talk about Object-Oriented Programming, which is a
style used in most, if not all, Java applications. The third part will
cover Core Java APIs, or Application Programming Interfaces.
Once you learn all this, I'm going to give you a project. You're
going to build a mortgage calculator on your own, so make sure
to pay great attention to all the materials. Make sure to use most
