People, if happen some problem about "error compiler of class file", it's possible to resolve changing project's JRE to its correspondent through of eclipse. 1 - build path 2 - configure build path 3 - Change library to correspondent of table that friend shows last. 4 - create "jar file" and compile and execute.

I did that. It worked.

Sorry about for my english.

If you're having some problem about "error compiler of class file", it's possible to resolve this by changing the project's JRE to its correspondent through Eclipse.

1. Build path
2. Configure build path
3. Change library to correspondent of table that friend shows last.
4. Create "jar file" and compile and execute.

I did that and it worked.