说明：  用java GUI写的计算器程序。程序安全，健壮。多输几个小数点也只记录一个，和Windows XP 里的计算器（标准型），功能上是一样的。2+3＝5,“2+3***”结果为5，不会连乘。“5*6＝＝180”会连乘，2+3*8＝40，2+3***8＝40,9/0＝0不报错
(java GUI with written procedures calculators. Safety procedures, robust. Lost more than a few decimal point only one record, and the Windows XP Lane Calculator (standard type), function is the same. 2 3 = 5, "2 3***" The results of the five, not continually multiply. "5* 6 == 180" will continually multiply, 2 3 8* 3 = 40,2 40,9*** = 8/0 = 0 errors)