How to configure selenium i eclipse on MACBOOK

Hello every one.

I am not able to configure selenium in eclipse on MACBOOK. I am able to add jar file into eclipse but i am not bale to set up external tool configuration setup. which we usually do with java file in the windows laptop. But in MACBOOK i am not able to setup configuration. so i am not able to run code. can some one help me out on this.....

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