The Java Tutorials have been written for JDK 8. Examples and practices described in this page don't take advantage of improvements introduced in later releases and might use technology no longer available.
See Java Language Changes for a summary of updated language features in Java SE 9 and subsequent releases.
See JDK Release Notes for information about new features, enhancements, and removed or deprecated options for all JDK releases.
The first thing you need is a contract file. You can download and use this very basic sample file named
contract
. Or you can use any other file you like. Just be sure to name the file contract
so it will work with the commands specified in this lesson.
Once you've got the contract file, place it into a JAR file. In your command window type the following:
jar cvf Contract.jar contract
This command creates a JAR file named Contract.jar
and places the contract
file inside it.