Hello,

because I don´t know anything about gui containers and screens I want to know if it´s possible to create a JFrame with JButtons.. in minecraft while minecraft has to be freezed? If it´s not possible can anyone explain me the gui  Containers and Screens (I had read the tutorials on the wiki and I watched some tutorials on youtube, but I wan only a simple Gui for the player where no inventory will be displayed, only some text and 3 buttons) Thanks for help.

Minecraft does not contain or support the required framework infrastructure for Javax or J***** classes. It never will and it has its own Gui classes, interfaces, and methods. Learn them and study some minecraft code or do the tutorials.

because minecraft is written in java it can support it if you handle it right! And for the information I readed the minecraft code about the gui. You can open a frame with minecraft I just tested it. But thanks for your answer.