Java做计算器

用Java做计算器的一些代码：publicclassCalculatorextendsjavax.swing.JApplet{booleanbln=true;doubleformer,later;intc;Stringm;/**InitializestheappletCalculator*/publicvoidinit(){try{java.awt.EventQueue.invokeAndWait(newRunnable(){publicvoidrun(){initComponents();}});}catch(Ex