JAVA编写的小型计算器，GUI界面，实现了表达式运算，并有检错功能！- JAVA compilation smallcalculator ,GUI Frame, Has realized the expression operation, and has the error detection function .

平台使用eclipse，通过javafx来实现简单计算器的相关功能，包括加减乘除、括号运算和表达式错误检测。(The use of Eclipse platform, through the JavaFX to realize the function of a simple calculator, including brackets, add, subtract, multiply and divide operation and expression error detection.)