这是一个用java编写的菜单演示程序，用户可以通过点击菜单来打开一些对话框。-This is a menu prepared by java demo program, the user can click through the menu to open some dialog box.

用java编程语言实现计算器的基本运算功能，包括加、减、乘、除，以及求负、取余等，主要用到的组件有框架、面板、文本框、按钮和菜单栏等。-Basic computing capabilities of the calculator using java programming language, including addition, subtraction, multiplication, division, and seek negative, remainder, the main comp