How to import .class file in a .java file?

You can add a folder containing compiled classes to your project by right clicking the project, then select Properties > Java build path, then "Add External Class Folder"

Or choose "Add Class Folder" if you have copied the class files into a sub directory of your project.

This will add the class files to the projects classpath and you can then import the class into your java file using an import statement:

import my.package.MyClass;

Note: The package structure should be maintained under the folder that you add as a class folder. So if you add folder "myclasses" as a class folder, the directory structure should be as follows for the example above:

myclasses/my/package/MyClass.class

You could create a jar out of it and add it as a library -- jars are typically packaged with just the .class files. Just jam them into a .zip file with the correct directory structure and basic files (unzip another .jar to have a look inside) and rename to .jar. You could also use the official jar tool -- e.g., jar cvf TicTacToe.jar TicTacToe.class

http://java.sun.com/docs/books/tutorial/deployment/jar/build.html

_{(source: sun.com)}