Appears when run starts. How to remove it?
Answer 1, authority 100%
In order to run a program in IDEA, you need to create a launch configuration (which is what IDEA suggests you do). Select Edit Configurations from the menu that appears (or from the Run menu). In the window that appears, click the plus in the upper left corner and select Application. Select Main class (the class of your program that contains the
main method to execute when the program starts) and give the configuration a meaningful name. Save the configuration and select it from the menu located to the left of the Run button on the toolbar. Then you can run your application.