java簡單計(jì)算器源代碼

1、簡單計(jì)算器代碼package calcultorthree;/*本例實(shí)現(xiàn)了簡單計(jì)算器代碼，具備加減乘除和正弦功能，旨在抱磚引玉。熟悉java的同學(xué)，可以在此基礎(chǔ)上實(shí)現(xiàn)更復(fù)雜的功能。* author Fjsh*/public class CalcultorThree /新建對象，在構(gòu)造函數(shù)中進(jìn)行初始化JFrame frame;/新建窗體對象JButton buttonzero,buttondot,buttonequal;/ 新建按鈕 “ 0". "=JButt on butt on plus,butt onminu s,butt onm ultiple,butt on dev

2、isi on,buttonsin,buttontozero;/ 新建按鈕 “ +"- "“ * " /和歸零按鈕JButt on butt onon e,butt on two,butt on three,butt on four,butt on five,butt on six,buttonseven,buttoneight,buttonnine;/ 新建數(shù)字按鈕 “ 0" 1 " 2" 3" 4" 5" 6" 7" 8 JPa nel pan elwest,pa nelce nte

3、r,pa neleast;/新 建三個面板TextField tf;/新建文本區(qū)域?qū)ο髉ublic CalcultorThree()/初始化對象tf=new TextField(30);構(gòu)造空文本字段，字符寬度為30frame =new JFrame("CalculatorThree"); 構(gòu)造窗體對象，名稱為“ CalculatorThree pan elce nter= new JPa nel();構(gòu)造面板，放到窗體中央pan elwest=new JPa nel();構(gòu)造面板，放到窗體西邊pan eleast =new JPa nel();構(gòu)造面板，放到窗體東邊Han

4、dle h=new Handle();/新建Handle類對象，Handle類為事件監(jiān)聽類創(chuàng)立數(shù)字按鈕對象，1、2、3、4、5、6、7、& 9butto non e=new JButto n( "1");butto ntwo=new JButto n( "2");butto nthree=new JButt on ("3");butto nfour= new JButto n( "4");butt on five=new JButto n( "5");butto nsix= new JB

5、utto n( "6");butt on seve n=new JButt on ("7");butto neight=new JButto n( "8");butt onnin e=new JButt on ("9");panelcenter.setLayout(new GridLayout(3,3); 設(shè)置面板布局為網(wǎng)格布局，3 行 3 列/將數(shù)字按鈕添加到中間面板pan elce nter.add(butt onon e);pan elce nter.add(butt on two);pan elce nte

6、r.add(butt on three);pan elce nter.add(butt on four);pan elce nter.add(butt on five);pan elce nter.add(butt on six);pan elce nter.add(butt on seve n);pan elce nter.add(butt on eight);pan elce nter.add(butt onnin e);/為10個按鈕注冊事件監(jiān)聽器butt onon e.addAct ion Liste ner(h);butt on two.addAct ion Liste ner(h)

7、;butt on three.addAct ion Liste ner(h);butt on four.addAct ion Liste ner(h);butt on five.addAct ion Liste ner(h);butt on six.addAct ion Liste ner(h);butt on seve n. addAct ion Liste ner(h);butt on eight.addAct ion Liste ner(h);butt onnin e.addAct ion Liste ner(h);構(gòu)造按鈕“ 0“ .，注冊事件監(jiān)聽器，設(shè)置1行3列的布局，添加到到西邊的

8、面板butto nzero=new JButt on ("0");butto ndot=new JButto n(".");butt on equal=new JButt on ("=");butt on zero.addAct ion Liste ner(h);butt on dot.addActi on Liste ner(h);butt on equal.addActi on Liste ner(h);pan elwest.setLayout (new GridLayout(3,1);pan elwest.add(butt on

9、 zero);pan elwest.add(butt on dot);pan elwest.add(butt on equal);構(gòu)造操作按鈕 “ +-“ *“/“,s其中“'>0為歸零按鈕butto nplus=new JButto n("+");butt onminus=new JButt on ("-");butto nmultiple=new JButto n( "*");butt on devisi on=new JButt on ("/");butt onsin=new JButt on

10、("s in )；butto ntozero=n ew JButto n( ">0");paneleast.setLayout(new GridLayout(3,1);/ 設(shè)置西邊的布局為3 行 1 列將操作按鈕“ +-“*“ / “添加到西邊的面板中pan eleast.add(butt on plus);pan eleast.add(butt onminu s);pan eleast.add(butt onm ultiple);pan eleast.add(butt on devisi on);pan eleast.add(butt onsin);pan

11、 eleast.add(butt on tozero);/為操作按鈕“ +- “* “ / “注冊監(jiān)聽器>0 butt on plus.addAct ion Liste ner(h);butt onminu s.addAct ion Liste ner(h);butt onm ultiple.addAct ion Liste ner(h);butt on devisi on .addAct ion Liste ner(h);butt onsin. addActi on Liste ner(h);butt on tozero.addAct ion Liste ner(h);frame.se

12、tLayout(new BorderLayout(); 設(shè)置窗體為邊界布局frame.add(pa neleast,"East");將東邊面板pan eleast添加到窗體的東邊 frame.add(tf,BorderLayout.NORTH); /將tf文本區(qū)域添加到窗體的北邊，即頂部 frame.add(panelwest,BorderLayout.WEST); 將 panelwest 面板添加到窗體西邊 frame.add(panelcenter,BorderLayout.CENTER); 將 panelcenter面板添加到窗體中間 frame.pack();設(shè)置窗

13、體大小，適合其子組件的首選大小和布局 frame.setLocation(500,500);/ 設(shè)置窗體顯示位置為(500,500) frame.setDefaultCloseOperatio n(JFrame.EXIT_ON_CLOSE); 設(shè)置布局窗體默認(rèn)關(guān)閉方式 frame.setVisible(true);/ 設(shè)置窗體可見public static void main( Stri ng args) new CalcultorThree();主方法中新建對象class Handle implements ActionListener 實(shí)現(xiàn)動作監(jiān)聽器類int biaozhi=0;/此標(biāo)志標(biāo)

14、志加減乘除操作double flag仁0,flag2=0,flag3=0;/flag1 、flag2 為兩個操作數(shù)，flag3 為結(jié)果 Overridepublic void actio nPerformed(Actio nEve nt e) / 方法重寫try/此處可能會產(chǎn)生異常，用try、catch捕捉異常，不用處理if(e.getSource()=buttondot) 小數(shù)點(diǎn)tf.setText("0.");if(e.getSource()=buttontozero)/ 歸零操作tf.setText()；if(e.getSource()=buttonzero) 按鍵

15、0 操作tf.setText(tf.getText()+"0");flag仁Double.parseDouble(tf.getText(); 將文本區(qū)域轉(zhuǎn)換成Double 類型，賦給 flag1if(e.getSource()=buttonone)/ 按鍵 1 操作tf.setText(tf.getText()+"1");flag 仁 Double.parseDouble(tf.getText();else if(e.getSource()=buttontwo) 按鍵 2 操作tf.setText(tf.getText()+"2");

16、flag 仁 Double.parseDouble(tf.getText();else if(e.getSource()=buttonthree) 按鍵 3 操作tf.setText(tf.getText()+"3");flag 仁 Double.parseDouble(tf.getText();else if(e.getSource()=buttonfour) 按鍵 4 操作tf.setText(tf.getText()+"4");flag 仁 Double.parseDouble(tf.getText();else if(e.getSource()=

17、buttonfive)/ 按鍵 5 操作tf.setText(tf.getText()+"5");flag 仁 Double.parseDouble(tf.getText();else if(e.getSource()=buttonsix) 按鍵 6 操作tf.setText(tf.getText()+"6");flag 仁 Double.parseDouble(tf.getText();else if(e.getSource()=buttonseven) 按鍵 7 操作tf.setText(tf.getText()+"7");fla

18、g 仁 Double.parseDouble(tf.getText();else if(e.getSource()=buttoneight) 按鍵 8 操作tf.setText(tf.getText()+"8");flag 仁 Double.parseDouble(tf.getText();else if(e.getSource()=buttonnine)/ 按鍵 9 操作tf.setText(tf.getText()+"9");flag 仁 Double.parseDouble(tf.getText();if(e.getSource()=buttonplus) 加法操作tf.setText()；flag2=flag1;biaozhi=0;if(e.getSource()=buttonminus)/ 減法操作tf.setText()；flag2=flag1;biaozhi=1;if(e.getSource()=buttonmultiple) 乘法操作tf.setText()；flag2=flag1;biaozhi=2;if(e.getSource()=buttondevision) 除法操作tf.setText()；flag2=flag1;biaozhi=3;if(e.getSource()=buttonsi