importjava.awt.*;importjava.awt.event.*;classComputerExeextendsFrameimplementsActionListener{Buttonb1,b2,b3,b4;TextFieldt1,t2,t3;Labell1,l2;publicstaticvoidmain(String[]args)//程序入口{newComputerExe();//创建本窗体对象}ComputerExe()//构造方法{super("四则运算