Debug Problems

Hello!I am chinese,learn Java and use IDEA not long before.I have a problem,hope someone can help me.When i debug one file in IDEA,it debug all the files in one package.i don't know why.can i change this?In eclipse it is not like just debug the file you select.That is the file i want to debug has nothing wrong and other files in one package has something wrong,in this situation if i want to run the file(no bug) it can't runin IDEA,but can run in eclipse.
pool english.maybe you can't understand me.anymore thanks advance.

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