Simple Hello World Program In Java

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mikethedj4
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helloworld.png
First lets begin by opening a text editor. I'm running Ubuntu 10.04 so I'll be opening gedit, If you're running Kubuntu you should have kedit, and some other distributions have emacs. Don't use a word processor, we must use a text editor!!! Now put down the following source code in the text editor.
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public class helloworld { 
    public static void main(String[] args) { 
        System.out.println("Hello World!");
    }
}
Were gonna save it as helloworld.java on our desktop.

Now open up your terminal and navigate to the desktop by putting down the following terminal command.
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cd Desktop
This will change the directory to our desktop.

We will now be using the OpenJDK Java 6 Runtime as our compiler for our program.

If not already installed go ahead and use the following terminal command to install OpenJDK.
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sudo apt-get install openjdk-6-jre
Now that we have our compiler we need to compile our program that way it'll run. (Assuming you're still in the desktop directory on your terminal) Type in the following code in your terminal.
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javac helloworld.java
Now if there's any errors in the code the compiler will automatically detect the error, but in our case we don't so in order to run our program lets put down the following terminal command, and we will now see our program. (Note: Your java program should be a .class file)
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java helloworld
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