Sometimes, you may find the eclipse console is not displayed on its main window. If you want to make it attach to the main window of eclipse, this tutorial will help you.
How to make the console attach to the eclipse main window?
1.Rest eclipse perspective
You can click Window->Perspective->Reset Perspective to rest it.
If you have foud the console is not displayed on the eclipse main window, you can show it.
2.Show eclipse console
You can click Window->Show View->Console to make the console attach to the main window.