What is the function of the "out" and ".idea" folder in Intellij?

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Can someone clearly explain what is "out" and ".idea" folders in the project structure indicate? Though I'm not a beginner in Java, I need help understanding how all the components in a typical IDE work together. I previously used BlueJ which was very easy to use, but it masked all the background processes which I have difficulty understanding now.

Edit: Sorry I didn't check thoroughly for ".idea" but the "out" folder hasn't been defined in a general sense.

intellij-idea java
3 Answers

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Lets consider the basic project setup.

  1. Here src folder contains all the class files i.e java files.In this example its main.java
  2. out folder is the project output folder.This folder will be organised hierarchically, which is similar to the src folder.This folder contains the compiled class file.In this example it is main.class out_Reference
  3. idea directory that keeps project settings.idea_Reference

 

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