A simple Java2Script application

As with any Java application, the first thing is to create an Eclipse project. But instead of creating a common Java application project, we will create a Java2script application project. To do so, go to menu File -> New... -> Other... and in the dialog select Java2Script Project:

The following steps for finishing creating the Java2Script project are equal to Java project's. Just enter a valid project name and click next/finnish. Congratulations you have created your first Java2Script project!

Now, we will create a simple Java hello world program and see how easily can be executed in an HTML document. First create a Java package like my.first.project and add a Java class named HelloWorld inside it with the following code:

package my.first.project;

public class HelloWorld {

	public static void main(String[] args) {
		System.out.println("hello world");
	}

}
    

Save the file with CTRL + S. Now we will execute the HelloWorld class as a Java2Script application. An HTML document named my.first.project.HelloWorld.html will be created that launch our little Java application. You can launch your Java2Script application in the same way you launch a normal Java application: right click you Java code -> Run As -> Java2Script Application:

When you run a Java class as a Java2Script Application, the J2S console Eclipse view will be opened and it will show an HTML document which will execute your Java application. This view is a simple browser and in fact you can also open the generated HTML document with your favourite browser:

Congratulations, you have just executed your first Java2Script application! As you can see, java2script simulate the System.out.println method call pending a paragraph with text to the html document. Another thing to notice, is that if you refresh your project, you will see a new html file at the root