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I am not sure what your problem actually is, but here is an overview that hopefully helps:
When you want to use 3rd party JARs for your project, you need to do three things:
your IDE must know that x.jar will be used by the project, that is where you add an
external
jar in bluej, see
here
in your source code for your classes, you have to
import
any 3rd party class, so that the compiler knows you want to use it
later, when "shipping" your project to other people, you have to include the jar files, too. And of course, your class path setup must be correct.
When you want to use 3rd party JARs for your project, you need to do three things:
your IDE must know that x.jar will be used by the project, that is where you add an external jar in bluej, see here
in your source code for your classes, you have to import any 3rd party class, so that the compiler knows you want to use it
later, when "shipping" your project to other people, you have to include the jar files, too. And of course, your class path setup must be correct.
First You have to Extract the .jar file into the library folder of BlueJ.
Then goto to Tools option, then Preferences option, then choose Libraries
& then Add File then select .jar file from BlueJ/lib/userlib/__.jar
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