科学计算器程序Java代码.docx

科学计算器程序Java代码————————————————————————————————作者:————————————————————————————————日期: MC:清除独立内存里的数字MR:读出独立内存数字MS:将显示数字保存到独立内存,并取代内存中原有数字M+:将显示数字向独立内存累加(独立内存是一个临时寄放数字的存储器,方便计算)CE:纠错键(CLEARERROR).输入数字有错,按它可以重新输入C:表示清零,将计算器恢复到开机状态功能举例:源程序如下:;;;;;;;;;;;;;;;;;;;lassCalucatorextendsJFrame{ privateJTextFieldtf; privateJPanelpanel1,panel2,panel3,panel4; privateJMenuBarmyBar; privateJMenumenu1,menu2,menu3; privateJMenuItemeditItem1,editItem2,help1,help2,help3; privateJRadioButtonMenuItemseeItem1,seeItem2;//单选框 privateJCheckBoxMenuItemseeItem3;//复选框 privateButtonGroupbgb; privateStringback; privatebooleanIfResult=true,flag=false; privateStringoper="="; privatedoubleresult=0; privateNumnumActionListener; privateDecimalFormatdf; alucator(){ super("科学计算器");//设置标题栏 df=newDecimalFormat("#.####");//保留四位小数 (newBorderLayout(10,5)); panel1=newJPanel(newGridLayout(1,3,10,10)); panel2=newJPanel(newGridLayout(5,6,5,5));//5行6列 panel3=newJPanel(newGridLayout(5,1,5,5)); panel4=newJPanel(newBorderLayout(5,5)); /** *菜单栏*/ myBar=newJMenuBar(); menu1=newJMenu("编辑(E)"); menu2=newJMenu("查看(V)"); menu3=newJMenu("帮助(H)"); (newFont("宋体",,12)); (newFont("宋体",,12)); (newFont("宋体",,12)); /** *编辑栏*/ editItem1=newJMenuItem("复制(C)Ctrl+C"); editItem2=newJMenuItem("粘贴(P)Ctrl+V"); (newFont("宋体",,12)); (newFont("宋体",,12)); /** *查看栏*/ seeItem1=newJRadioButtonMenuItem