//?Calculator.java
public?class?Calculator?{

??private?static?final?char?NO_OP?=?‘\0‘;
??private?static?final?char?PLUS?=?‘+‘;
??private?static?final?char?SUBTRACT?=?‘-‘;
??private?static?final?char?MULTIPLY?=?‘*‘;
??private?static?final?char?DIVIDE?=?‘/‘;

??private?float??number1?=?0.0F;
??//private?float??number2?=?Float.NaN;
??private?char???operator?=?NO_OP;

??//等于運算
??public?String?opEquals（String?number）?{
????float?result;

????if?（?operator?==?NO_OP?）?{
??????result?=?parseNumber（number）;
????}?else?{
??????result?=?performOperation（parseNumber（number））;
????}
????operator?=?NO_OP;

????number1?=?result;

????return?Float.toString（result）;
??}

??//加法運算	
??public?String?opAdd（String?number）?{
????float?result;

????if?（?operator?==?NO_OP?）?{
??????result?=?parseNumber（number）;
????}?else?{
??????result?=?performOperation（parseNumber（number））;
????}
????operator?=?PLUS;

????number1?=?result;

????return?Float.toString（result）;
??}

??//減法運算
??public?String?opSubtract（String?number）?{
????float?result;

????if?（?operator?==?NO_OP?）?{
??????result?=?parseNumber（number）;
????}?else?{
??????result?=?performOperation（parseNumber（number））;
????}
????operator?=?SUBTRACT;

????number1?=?result;

????return?Float.toString（result）;
??}

??//乘法運算
??public?String?opMultiply（String?number）?{
????float?result;

????if?（?operator?==?NO_OP?）?{
??????result?=?parseNumber（number）;
????}?else?{
??????result?=?performOperation（parseNumber（number））;
????}
????operator?=?MULTIPLY;

????number1?=?result;

????return?Float.toString（result）;
??}

??//除法運算
??public?String?opDivide（String?number）?{
????float?result;

????if?（?operator?==?NO_OP?）?{
??????result?=?parseNumber（number）;
????}?else?{
??????result?=?performOperation（parseNumber（number））;
????}
????operator?=?DIVIDE;

????number1?=?result;

????return?Float.toString（result）;
??}

??//處理運算符
??private?float?performOperation（float?number2）?{
????float?result?=?0.0F;

????switch?（?operator?）?{
????case?PLUS:
??????result?=?number1?+?number2;
??????break;
????case?SUBTRACT:
??????result?=?number1?-?number2;
??????break;
????case?MULTIPLY:
??????result?=?number1?*?number2;
??????break;
????case?DIVIDE:
??????result?=?number1?/?number2;
??????break;
????}

????return?result;
??}

??//將字符串類型轉(zhuǎn)換為浮點型
??private?static?float?parseNumber（String?number）?{
????float?real_number;

????try?{
??????real_number?=?Float.parseFloat（number）;
????}?catch?（NumberFormatException?e）?{
??????real_number?=?Float.NaN;
????}

????return?real_number;
??}

}

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件???????1594??2018-08-10?15:35??JAVA小游戲源碼\練習(xí)100計算器\Calculator.class

?????文件???????2681??2003-04-28?16:09??JAVA小游戲源碼\練習(xí)100計算器\Calculator.java

?????文件????????525??2018-08-10?15:35??JAVA小游戲源碼\練習(xí)100計算器\CalculatorGUI$1.class

?????文件???????1261??2018-08-10?15:35??JAVA小游戲源碼\練習(xí)100計算器\CalculatorGUI$NumberButtonHanlder.class

?????文件???????1444??2018-08-10?15:35??JAVA小游戲源碼\練習(xí)100計算器\CalculatorGUI$OpButtonHanlder.class

?????文件???????3247??2018-08-10?15:35??JAVA小游戲源碼\練習(xí)100計算器\CalculatorGUI.class

?????文件???????4266??2003-04-28?16:09??JAVA小游戲源碼\練習(xí)100計算器\CalculatorGUI.java

????..A.SH.????????10??2006-11-19?09:49??JAVA小游戲源碼\練習(xí)100計算器\_desktop.ini

?????文件??????58880??2003-08-01?17:34??JAVA小游戲源碼\練習(xí)100計算器\練習(xí)100計算器.doc

?????文件???????2976??2003-04-28?13:58??JAVA小游戲源碼\練習(xí)94煙花\Fireworks.class

?????文件?????????97??2003-04-28?13:59??JAVA小游戲源碼\練習(xí)94煙花\Fireworks.html

?????文件???????3689??2003-04-28?14:45??JAVA小游戲源碼\練習(xí)94煙花\Fireworks.java

????..A.SH.????????10??2006-11-19?09:49??JAVA小游戲源碼\練習(xí)94煙花\_desktop.ini

?????文件??????46592??2003-08-01?17:35??JAVA小游戲源碼\練習(xí)94煙花\練習(xí)94煙花.doc

?????文件???????2197??2003-07-22?13:31??JAVA小游戲源碼\練習(xí)97抓不住的方塊\MouseTrack.class

?????文件????????157??2004-05-18?08:38??JAVA小游戲源碼\練習(xí)97抓不住的方塊\MouseTrack.html

?????文件???????1940??2003-07-23?21:43??JAVA小游戲源碼\練習(xí)97抓不住的方塊\MouseTrack.java

????..A.SH.????????10??2006-11-19?09:49??JAVA小游戲源碼\練習(xí)97抓不住的方塊\_desktop.ini

?????文件??????38912??2003-08-01?17:36??JAVA小游戲源碼\練習(xí)97抓不住的方塊\練習(xí)96抓不住的方塊.doc

?????文件????????226??2018-08-10?16:00??JAVA小游戲源碼\練習(xí)98模擬鋼琴\.classpath

?????文件????????396??2018-08-10?16:00??JAVA小游戲源碼\練習(xí)98模擬鋼琴\.project

?????文件???????1010??2000-03-22?01:51??JAVA小游戲源碼\練習(xí)98模擬鋼琴\AU\0.AU

?????文件????????946??2000-03-22?01:51??JAVA小游戲源碼\練習(xí)98模擬鋼琴\AU\1.AU

?????文件????????989??2000-03-22?01:51??JAVA小游戲源碼\練習(xí)98模擬鋼琴\AU\10.AU

?????文件????????989??2000-03-22?01:51??JAVA小游戲源碼\練習(xí)98模擬鋼琴\AU\11.AU

?????文件????????989??2000-03-22?01:51??JAVA小游戲源碼\練習(xí)98模擬鋼琴\AU\12.AU

?????文件????????989??2000-03-22?01:51??JAVA小游戲源碼\練習(xí)98模擬鋼琴\AU\13.AU

?????文件????????989??2000-03-22?01:51??JAVA小游戲源碼\練習(xí)98模擬鋼琴\AU\14.AU

?????文件???????1039??2000-03-22?01:51??JAVA小游戲源碼\練習(xí)98模擬鋼琴\AU\2.AU

?????文件????????993??2000-03-22?01:51??JAVA小游戲源碼\練習(xí)98模擬鋼琴\AU\3.AU

............此處省略40個文件信息