javaGUI用户图形实现简单计算器

packageexperiment1;publicclassCalculator{privateCalcEngineengine;privateUserGUIgui;publicCalculator(){engine=newCalcEngine();gui=newUserGUI(engine);}publicvoidshow(){gui.setVisible(true);}publicstaticvoidmain(Stringargs[]){Calculatorcalc=newCalculator();calc.show();