java - Where is the add as maven project of idea?

Question

There is a prompt when you first enter

I didn’t have time to click

Now the pom is filled with red

I have recently deleted all the code and re-imported it. It prompts various problems

What is going on? Is it not completely deleted? ? ? ?

And when entering idea, there is no navigation bar on the left.

Answer 1

This can be set when importing the project and creating the project. I have not tried making changes after importing.

But you can delete the project in idea first and then import it again

Answer 2

Right-click on the pom file and select the maven option below to add as maven proiect

To supplement your question, the left column is not displayed. Just select view-Tool windows to make a selection. If it prompts you that jdk is not set, go to the setting to check whether jdk is not set.