Exercise 0 (Won't be evaluated!)

Install a JDK

Make sure that there is an existing JDK installation on your machine. Use your package manager or download it, e.g. from Oracle:

http://www.oracle.com/technetwork/java/javase/downloads/index.html

Execute the command java -version

If the version number is less than 1.6.0 then install a more up-to-date version.

Create a file HelloWorld.java

class HelloWorld {
    public static void main(String args[]) {
        System.out.println("Hello World!");
    }
}

Compilation and Execution

Enter into the directory where the file HelloWorld.java is located and type the following command in the command line for compiling the java source code:

javac HelloWorld.java

If everything goes smoothly you will not get any error message and you can find a file HelloWorld.class in the same directory.
You can start the program with the following command:

java HelloWorld

The result/output should be the text „Hello World!”.

Upload the file in Moodle

Upload the file HelloWorld.java in Moodle.