计算器布局显示：
功能举例：①132033②71498：先输入7，再单击将其变成负数，然后依次单击×号、14与＝③75040④si
30°05：先输入30，然后按下′″按钮转换成角度值，再按下si
即可显示结果⑤sqrt42：利用鼠标点击4后再点击sqrt按键即可显示结果⑥2π62832……
源程序如下：importjavaawtBorderLayoutimportjavaawtColorimportjavaawtDime
sio
importjavaawtFo
timportjavaawtGridLayoutimportjavaawteve
tActio
Eve
timportjavaawteve
tActio
Liste
erimportjavatextDecimalFormat
importjavaxswi
gBorderFactoryimportjavaxswi
gButto
Groupimportjavaxswi
gJButto
importjavaxswi
gJCheckBoxMe
uItemimportjavaxswi
gJFrameimportjavaxswi
gJMe
uimportjavaxswi
gJMe
uBarimportjavaxswi
gJMe
uItemimportjavaxswi
gJPa
elimportjavaxswi
gJRadioButto
Me
uItemimportjavaxswi
gJTextField
fpublicclassCalucatorexte
dsJFrameprivateJTextFieldtfprivateJPa
elpa
el1pa
el2pa
el3pa
el4privateJMe
uBarmyBarprivateJMe
ume
u1me
u2me
u3privateJMe
uItemeditItem1editItem2help1help2help3privateJRadioButto
Me
uItemseeItem1seeItem2单选框privateJCheckBoxMe
uItemseeItem3复选框privateButto
GroupbgbprivateStri
gbackprivateboolea
IfResulttrueflagfalseprivateStri
goper