jar commands

//list files in jar

jar tf xx.jar      

//update file in jar

jar uvf xx.jar newfile

jar uvf xx.jar org.google.newclassfile  // newclassfile in ./org/google/

//extract jar

jar xf xx.jar

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References

http://blog.163.com/yde1208@126/blog/static/958727092012101311253447/

http://nicegege.iteye.com/blog/1181072

http://blog.csdn.net/zhang_red/article/details/17142263