How to extract Java Apps or Jar file I need the DataBase.?

[iice cage]

There are thousands most useful jar app for old java phone like dictionaries how to hack or extract the file and collect data.? i want it to use to my project for Universal apps. Just to retrieving the DataBase to C# code. {I can't Find the Developer Forum};

 

[RumoredNow]

Oracle is the best source: Extracting the Contents of a JAR File (The Java™ Tutorials > Deployment > Packaging Programs in JAR Files) since they made the stuff!!!