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This is "Hello World" Example for Java.

The structureHelloWorld package is like this:

example.java.helloworld/|-- HelloWorld|   `-- Main.java|-- LICENSE|-- Manifest.txt`-- README.md

For compile the main class for package, execute the follow command:

javac HelloWorld/Main.java

This generate theMain.class file intoHelloWorld directory.

For run the main class for package, execute the follow command:

java -cp . HelloWorld.Main

This show theHello world message.

For pack the main class for package as a JAR file, execute the follow command:

jar cfme Main.jar Manifest.txt HelloWorld.Main HelloWorld/Main.class

For run the JAR file packed, execute the follow command:

java -jar Main.jar

This show theHello world message.

• java - How to run a JAR file - Stack Overflow.
• Setting an Application's Entry Point (The Java™ Tutorials > Deployment > Packaging Programs in JAR Files).