It is about creating a program that has a main window where you type text, and a secondary window where the text is sent line by line .
The main window contains an editable text box where the user will type the line to send, and a submit button.
It will also close the program.
So i try to use observer and observable to creat the two windows but the first class extends observer and its extends also jframe!!!
have you any solution to creat this to windows ?