记事本-txt，运用java的图形用户界面操作及相应的事件处理机制实现一般记事本的功能-Notepad-txt, using java graphical user interface operation and the corresponding event handling mechanism to achieve the functions of a general notebook

计算器-calculator，运用java的图形用户界面处理机制设计java记事本的主界面及运用相应的事件处理机制处理相应的操作-Calculator-calculator, using java graphical user interface processing mechanism design java Notepad and use the main interface, event handling mechanism to deal with the corresponding a