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實現加、減、乘、除、撤銷、清零、小數點功能，netbeans8.0，界面沒有涉及，知識初步學習，課上完成的練習
代碼片段和文件信息
/*
?*?To?change?this?license?header?choose?License?Headers?in?Project?Properties.
?*?To?change?this?template?file?choose?Tools?|?Templates
?*?and?open?the?template?in?the?editor.
?*/
/**
?*
?*?@author?HP-Developer
?*/
public?class?NewJframe?extends?javax.swing.Jframe?{
????private?double?number1;
????private?double?number2;
????private?String?operator;
????private?double?result;
????private?String?shanchu;
????/**
?????*?Creates?new?form?NewJframe
?????*/
????public?NewJframe（）?{
????????initComponents（）;
????}
????/**
?????*?This?method?is?called?from?within?the?constructor?to?initialize?the?form.
?????*?WARNING:?Do?NOT?modify?this?code.?The?content?of?this?method?is?always
?????*?regenerated?by?the?Form?Editor.
?????*/
????@SuppressWarnings（“unchecked“）
????//? ?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2015-09-15?15:42??Jisuanqi\
?????文件????????3609??2015-09-15?15:34??Jisuanqi\build.xm
?????文件??????????85??2015-09-15?15:34??Jisuanqi\manifest.mf
?????目錄???????????0??2015-09-15?15:34??Jisuanqi\nbproject\
?????文件???????79320??2015-09-15?15:34??Jisuanqi\nbproject\build-impl.xm
?????文件?????????475??2015-09-15?15:34??Jisuanqi\nbproject\genfiles.properties
?????文件????????2452??2015-09-15?15:34??Jisuanqi\nbproject\project.properties
?????文件?????????516??2015-09-15?15:34??Jisuanqi\nbproject\project.xm
?????目錄???????????0??2015-09-15?15:34??Jisuanqi\src\
?????目錄???????????0??2015-09-15?15:34??Jisuanqi\src\jisuanqi\
?????文件?????????449??2015-09-15?15:34??Jisuanqi\src\jisuanqi\Jisuanqi.java
?????文件???????17063??2015-09-15?16:49??Jisuanqi\src\NewJfr
?????文件???????22252??2015-09-15?16:49??Jisuanqi\src\NewJfr
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