Thanks! for help, yea problem was in build path i am writing steps may be helpful for someone else.
1- After opening project window(menu) > Preference then select Java>build Path > classpath variable and click on new button and give variable name and path of unzipped mysql connector folder in the appeared dialogue box, click ok again ok.
2- Right click on Project Properties select Java Build Path then click on Libraries tab then click on classpath variable. Select the newly formed variable from the list then click on Extend button ___.jar file will appear click on jar file then click ok, ok.