How to execute jar file

Dear all,
1. I am trying to import a .jar file and execute (run) in eclipse. I know it can be done from command window by java -jar z.jar . But I am supposed to do it in eclipse . I would appreciate your help.
2. jar files are supposed to be executable. But in my premium window vista as well as in XP it doesnot run by double click though I have given the class path. How can it be done?

jar files are supposed to be executable.Only if you have a file association for the extension.
Presumably when you double-click the .jar file, Windows pops up the "Open With" dialog. Select from the list or click Browse... and navigate to java.exe (javaw.exe if you are only going to run GUI applications) in the jre/bin folder. Select "Always use the selected program to open this kind of file" and optionally enter a description for the file type before clicking OK.
Note that a console application opened in this way may flash the console window and terminate i.e. the console will NOT remain open after the application dies.
I don't use Eclipse so I can't help on your other question.
db

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