此程序可以进行简单的数值运算，但还有些不甚完善，还望指教-This procedure can be a simple numerical computation, but some are not very perfect, but also look Zhijiao

小型计算器，有图形界面,求高手编一个JAVA计算器，能够在输出显示屏上显示所输入的式子，并且能够进行4则混和运算。比如：要求（8-4*4）/（4-6） 就只要输入这个式子便可计算出结果-Small calculator, a graphical interface, find the master code of a JAVA calculator that can display the output screen input formula, and mixing operations ca