How Do You Run Code in the Eclipse IDE?

Problem scenario
You are using Eclipse for the first time. You try to to use Run, but you get an error message like this: "Unable to Launch The selection cannot be launched, and there are no recent launches." Or you try to go to "Run configuration" and you have a prototype, but the "Run" button is grayed out. What should you do?

In the Run configuration section, under the Java Application section on the left, is there a configuration? A prototype is not enough. Right click "Java Application" to create a configuration. Make sure the "Main" tab's "Main class" has something valid. Now the "Run" button should appear. You should be able to run code now.

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