(完整版)java畢業(yè)課程設(shè)計呂磊代碼1(科學(xué)計算器).doc

1、importjavax.swing.*;把 javax包里面的 swing 包里面的所有東西 引進來importjava.awt.*;導(dǎo)入 awt 包里的所有 java 類importjava.awt.event.*;導(dǎo)入包 eventimportjava.text.DecimalFormat;處理文本、日期、數(shù)字和消息的類和接口importjava.awt.Color;importjava.awt.Dimension;importjava.awt.Font;importjava.awt.GridLayout;importjava.awt.Image;importjava.awt.Toolki

2、t;importjava.awt.event.ActionEvent;importjava.awt.event.ActionListener;publicclassbiaozhunjisuanqiextendsJFrameimplementsActionListener public代表該類公有class 聲明一個類biaozhunjisuanqi為類名extends是繼承類implements窗體名稱biaozhunjisuanqi繼承 JFrame 類和ActionListener接口，并實現(xiàn)public voidactionPerformed(ActionEvent e)方法privat

3、estaticfinallongserialVersionUID= 1L;serialVersionUID相當于 java類的身份證 ,默認為 1L, serialVersionUID作用是序列化時保持版本的兼容性，即在版本升級時反序列化仍保持對象的唯一性privateJPaneljContentPane=null ; 創(chuàng)建面板對象 , null代表為這些變量賦初值為空，即不分配內(nèi)存空間，變量不指向任何地址。private 是訪問控制符，代表這些變量的訪問級別為私有，私有級別只能在當前類中進行訪問,這些（ JPanel 、JTextArea、JPanel 、 JButton）是 java 中A

4、WT（包）中的類，用能進行桌面級應(yīng)用程序的開發(fā)，就像平時用的word ，上面有各種文本框，菜單欄，工具欄按鈕等等，這些都是對象privateJPaneljPanel = null;JPanel 作為一個容器，可以包容一些組件，然后將這個 JPanel對象作為一個組件添加到另一個容器( 稱作父容器 ) 中privateJButtonjButton = null;9 JButton 是用戶進行計算時主要的使用工具，一般為其添加 actionPerformed事件。privateJButtonjButton1=null; ()privateJButtonjButton2=null; (sqrt)pr

5、ivateJButtonjButton3=null; (4)privateJButtonjButton4=null; (5)privateJButtonjButton5=null; (6)privateJButtonjButton6=null; (*)privateJButtonjButton7=null; (%)privateJButtonjButton8=null; (1)privateJButtonjButton9=null; (7)privateJButtonjButton10=null; (8)privateJButtonjButton11=null; (2)privateJButt

6、onjButton12=null; (3)privateJButtonjButton13=null; (-)privateJButtonjButton14=null; (1x)privateJButtonjButton15=null; (0)privateJButtonjButton16=null; (+-)privateJButtonjButton17=null; (.)privateJButtonjButton18=null; (+)privateJButtonjButton19=null; (=)privateJTextFieldjTextField=null; JTextField是一

7、個的文本框privateJTextFieldtextMemory=null; 作為輸入 M用privateJButtonjButton20=null; (MC)privateJButtonjButton21=null; (MR)privateJButtonjButton22=null; (MS)privateJButtonjButton23=null; (M+)privateJButtonjButton24=null; (Backspace)privateJButtonjButton25=null; (CE)privateJButtonjButton26=null; (C)doublememo

8、ryd ;使用內(nèi)存中存儲的數(shù)字intmemoryi ;科學(xué)計算器按鈕privateJButtonjButton31=null ; ( 十六進制 )privateJButtonjButton32=null; (sin)privateJButtonjButton33=null; (cos)privateJButtonjButton34=null; (十進制 )privateJButtonjButton35=null; (tan)privateJButtonjButton36=null ; ( 弧度 )privateJButtonjButton37=null ; ( 八進制 )privateJBut

9、tonjButton38=null; (X2)privateJButtonjButton39=null; (X3)privateJButtonjButton40=null ; ( 二進制 )privateJButtonjButton41=null; (Xy)privateJButtonjButton42=null; (n!)privateJButtonjButton43=null; (Pi)privateJButtonjButton44=null; (ln)privateJButtonjButton45=null; (log10)A-FprivateJButtonjButton46=null;

10、 (A)privateJButtonjButton47=null; (B)privateJButtonjButton48=null; (C)privateJButtonjButton49=null; (D)privateJButtonjButton50=null; (E)privateJButtonjButton51=null; (F)privateJPaneljPanel1 =null;privateJPaneljContentPane1=null ;privateStringstr ="" ; 聲明私有字符串變量 strprivatedoubledataone ; 變量

11、名用來存儲運算的數(shù)據(jù)privatechar Operator ='A' ;存放運算符privatebooleanpointIsTyped=false;判斷輸入的數(shù)據(jù)是否是小數(shù)privateJMenuBarjJMenuBar=null;privateJMenujMenu = null;JMenu 定義菜單 編輯鍵privateJMenuItemjMenuItem=null;JMenuItem 菜單中項的實現(xiàn)復(fù)制（ Ctrl+C）privateJMenuItemjMenuItem1=null; 粘貼（ Ctrl+V）privateJMenujMenu1 = null; 定義查看菜單

12、private JMenuItem jMenuItem3 = null ; 幫助主題 private JMenuItem jMenuItem4 = null ; 關(guān)于計算器 private JMenu jMenu2 = null ; 定義幫助菜單 private JMenuItem jMenuItem5 = null ; 標準型privateJMenuItemjMenuItem6=null; 科學(xué)型private JMenuItem jMenuItem7 = null ; 勾股定理 private JMenuItem jMenuItem8 = null ; 解一元二次方程DecimalForm

13、atdf ; 保留小數(shù)位數(shù)privateJButton getJButton() 使用 private JButton getJButton()方法添加按鈕并給按鈕命名if( jButton=null) jButton=new JButton();jButton.setText("9" );jButton.setFont(new Font( " 楷體 " , Font. BOLD, 30);使用jButton.setFont(new Font("楷體 ", Font.BOLD, 30)方法設(shè)置按鈕的字體jButton.setForeg

14、round(new Color();使用方法設(shè)置按鈕的字體顏色紅色、綠色和藍色jButton.setFocusable(false );jButton.addActionListener(new ActionListener() 相當于聲明了一個實現(xiàn)了 ActionListener接口的對象 .(因為可以看到其中的方法都被重寫實現(xiàn)了.) 更多具體細節(jié),可以參考java匿名類的使用, 就是把對象jButton注冊給事件監(jiān)聽者newActionListener() Public void actionPerformed(ActionEvent ae) ActionListener() Public

15、 void actionPerformed(ActionEvent )說明一下 new是一個匿名內(nèi)部類，用來實現(xiàn)對動作事件的處理publicvoidactionPerformed(ActionEvente) 這是ActionListener中定義的方法，事件監(jiān)聽器, 當定義的事件捕獲以后就會執(zhí)行這個方法里面的代碼str +="9" ;jTextField.setText(str ); jTextField是 api(ApplicationProgram Interface應(yīng)用程序接口) 里面得一個文本主鍵，要掉用它就要import實現(xiàn)接口,jtextfield文本框 .用來

16、建立文本框的，用戶可以在文本框輸入單行的文本。在JavaSwing 中的加 “ J ”字頭的文本輸入框包括兩種，單行文本輸入框(jtextfield)和多行文本輸入框(JTextArea)。);單擊后變色jButton.addMouseListener(new MouseListener()設(shè)置數(shù)字按鈕1 到9并添加監(jiān)控，使其在發(fā)生鼠標事件時改變按鈕顏色publicvoidactionPerformed(MouseEvent e) 這是 MouseListener中定義的方法， java 的事件監(jiān)聽器的一個，例如點擊按鈕、文本框里按下回車，就會調(diào)用這個里面的方法。jButton.setFore

17、ground(new Color();Foreground指前背景色publicvoidmouseClicked(MouseEvent e) 鼠標單擊方法(鼠標點擊后 )jButton.setForeground(new Color();publicvoidmouseEntered(MouseEvent e) 鼠標進入組件方法( 鼠標進入某個區(qū)域后)jButton.setForeground(new Color();publicvoidmouseExited(MouseEvent e) 鼠標退出組件方法( 鼠標離開某個區(qū)域后)jButton.setForeground(new Color();

18、publicvoidmousePressed(MouseEvent e) 鼠標按鍵按下后jButton.setForeground(new Color();publicvoidmouseReleased(MouseEvent e) 被按住的鼠標按鍵釋放后jButton.setForeground(new Color(););returnjButton;privateif個事件偵聽器JButton getJButton1() 注冊按鈕( jButton1=null) jButton1=new JButton();實例化一個對象, 給按鈕添中符合.jButton1.setText("&q

19、uot; );jButton1.setFont(new Font(" 楷體 " , Font.BOLD, 30);jButton1.setForeground(new Color();jButton1.addActionListener(new ActionListener() 給 jButton1new ActionListener(),當jButton被按下的時候，所需要發(fā)生的事情定義在添加一newActionListener()里publicvoidactionPerformed(ActionEvent e) str =jTextField.getText();Ope

20、rator=''dataone =Double.parseDouble( str ); 表示將轉(zhuǎn)換好的Double類型的數(shù)值賦值給dataone類str ="" ;jTextField.setText(str ););returnjButton1;privateif(JButton("sqrt");JButton getJButton2() jButton2=null) jButton2=new JButton("sqrt"對其設(shè)置監(jiān)控，調(diào)用Math.sqrt(); 開根號運算，定義jButton2 = new方法來實

21、現(xiàn)開根號運算，并在文本框中輸出結(jié)果jButton2.setFont(new Font(" 楷體 " , Font.BOLD, 30);Font 字體的意思，楷體，加粗，字體號大小30jButton2.setForeground(new Color();jButton2.addActionListener(new ActionListener() publicvoidactionPerformed(ActionEvent e) doublea=Double.parseDouble( jTextField.getText();表示將轉(zhuǎn)換好的 Double 類型的數(shù)值賦值給dou

22、ble 類型的變量。doubleb;if (a<0)jTextField.setText(" 負數(shù)不能開平方" );else b=Math. sqrt(a);jTextField.setText(Double.toString(b);Double.toString(next()將這個數(shù)double數(shù)轉(zhuǎn)化成 String類型（字符串）);returnjButton2;privateJButton getJButton3() if( jButton3=null) jButton3=new JButton();jButton3.setText("4");

23、jButton3.setFont(new Font(" 楷體 " , Font. BOLD, 30);jButton3.setForeground(new Color();jButton3.setFocusable(false);jButton3.addActionListener(new ActionListener() publicvoidactionPerformed(ActionEvent e) str+="4"jTextField.setText(str););jButton3.addMouseListener(new MouseListene

24、r()publicvoidactionPerformed(MouseEvent e) jButton3.setForeground(new Color();publicvoidmouseClicked(MouseEvent e) jButton3.setForeground(new Color();publicvoidmouseEntered(MouseEvent e) jButton3.setForeground(new Color();publicvoidmouseExited(MouseEvent e) jButton3.setForeground(new Color();publicv

25、oidmousePressed(MouseEvent e) jButton3.setForeground(new Color();publicvoidmouseReleased(MouseEvent e) jButton3.setForeground(new Color(););returnjButton3;privateJButton getJButton4() if( jButton4=null) jButton4=new JButton();jButton4.setText("5");jButton4.setFont(new Font(" 楷體 "

26、 , Font. BOLD, 30);jButton4.setForeground(new Color();jButton4.setFocusable(false);jButton4.addActionListener(new ActionListener() publicvoidactionPerformed(ActionEvent e) str+="5"jTextField.setText(str););jButton4.addMouseListener(new MouseListener()publicvoidactionPerformed(MouseEvent e)

27、 jButton4.setForeground(new Color();publicvoidmouseClicked(MouseEvent e) jButton4.setForeground(new Color();publicvoidmouseEntered(MouseEvent e) jButton4.setForeground(new Color();publicvoidmouseExited(MouseEvent e) jButton4.setForeground(new Color();publicvoidmousePressed(MouseEvent e) jButton4.set

28、Foreground(new Color();publicvoidmouseReleased(MouseEvent e) jButton4.setForeground(new Color(););returnjButton4;privateJButton getJButton5() if( jButton5=null) jButton5=new JButton();jButton5.setText("6");jButton5.setFont(new Font(" 楷體 " , Font. BOLD, 30);jButton5.setForeground(

29、new Color();jButton5.setFocusable(false);jButton5.addActionListener(new ActionListener() publicvoidactionPerformed(ActionEvent e) str+="6"jTextField.setText(str););jButton5.addMouseListener(new MouseListener()publicvoidactionPerformed(MouseEvent e) jButton5.setForeground(new Color();public

30、voidmouseClicked(MouseEvent e) jButton5.setForeground(new Color();publicvoidmouseEntered(MouseEvent e) jButton5.setForeground(new Color();publicvoidmouseExited(MouseEvent e) jButton5.setForeground(new Color();publicvoidmousePressed(MouseEvent e) jButton5.setForeground(new Color();publicvoidmouseRele

31、ased(MouseEvent e) jButton5.setForeground(new Color(););returnjButton5;privateJButton getJButton6() if( jButton6=null) jButton6=new JButton();jButton6.setText("*" );jButton6.setFont(new Font(" 楷體 " , Font.BOLD, 30);jButton6.setForeground(new Color();jButton6.addActionListener(new

32、 ActionListener() publicvoidactionPerformed(ActionEvent e) str =jTextField.getText();Operator='*'dataone =Double.parseDouble( str );str ="" ;jTextField.setText(str ););returnjButton6;privateJButton getJButton7() if( jButton7=null) jButton7=new JButton("%" ); 設(shè)置百分比按鈕，jButt

33、on7 = newJButton("%");使用變量 i1 來存放從文本框中讀出的數(shù)據(jù)并轉(zhuǎn)換成double 類型，定義 double 類型變量 z1，z1=i1100實現(xiàn)求百分比運算，在使用jTextField.setText(Double.toString(z1)使其在文本框中輸出結(jié)果jButton7.setFont(new Font(" 楷體 " , Font.BOLD, 30);jButton7.setForeground(new Color();jButton7.addActionListener(new ActionListener() pub

34、licvoidactionPerformed(ActionEvent e) doublei1=Double.parseDouble( jTextField.getText();doublez1=i1100;jTextField.setText(Double.toString(z1););returnjButton7;privateJButton getJButton8() if( jButton8=null) jButton8=new JButton();jButton8.setText("1");jButton8.setFont(new Font(" 楷體 &q

35、uot; , Font. BOLD, 30);jButton8.setForeground(new Color();jButton8.setFocusable(false);jButton8.addActionListener(new ActionListener() publicvoidactionPerformed(ActionEvent e) str+="1"jTextField.setText(str ););jButton8 .addMouseListener(new MouseListener()publicvoidactionPerformed(MouseEv

36、ent e) jButton8.setForeground(new Color();publicvoidmouseClicked(MouseEvent e) jButton8.setForeground(new Color();publicvoidmouseEntered(MouseEvent e) jButton8.setForeground(new Color();publicvoidmouseExited(MouseEvent e) jButton8.setForeground(new Color();publicvoidmousePressed(MouseEvent e) jButto

37、n8.setForeground(new Color();publicvoidmouseReleased(MouseEvent e) jButton8.setForeground(new Color(););returnjButton8;privateJButton getJButton9() if( jButton9=null) jButton9=new JButton();jButton9.setText("7");jButton9.setFont(new Font(" 楷體 " , Font. BOLD, 30);jButton9.setForeg

38、round(new Color();jButton9.setFocusable(false);jButton9.addActionListener(new ActionListener() publicvoidactionPerformed(ActionEvent e) str+="7"jTextField.setText(str););jButton9.addMouseListener(new MouseListener()publicvoidactionPerformed(MouseEvent e) jButton9.setForeground(new Color();

39、publicvoidmouseClicked(MouseEvent e) jButton9.setForeground(new Color();publicvoidmouseEntered(MouseEvent e) jButton9.setForeground(new Color();publicvoidmouseExited(MouseEvent e) jButton9.setForeground(new Color();publicvoidmousePressed(MouseEvent e) jButton9.setForeground(new Color();publicvoidmou

40、seReleased(MouseEvent e) jButton9.setForeground(new Color(););returnjButton9;privateif(JButton getJButton10() jButton10=null) jButton10=new JButton();jButton10.setText("8" );jButton10.setFocusable(false);jButton10.setFont(new Font(" 楷體 " , Font.BOLD, 30);jButton10.setForeground(n

41、ew Color();jButton10.addActionListener(new ActionListener() publicvoidactionPerformed(ActionEvent e) str +="8" ;jTextField.setText(str ););jButton10public.addMouseListener(new MouseListener()voidactionPerformed(MouseEvent e) jButton10.setForeground(new Color();publicvoidjButton10mouseClick

42、ed(MouseEvent e) .setForeground(new Color();publicvoidjButton10mouseEntered(MouseEvent e) .setForeground(new Color();publicvoidjButton10mouseExited(MouseEvent e) .setForeground(new Color();publicvoidjButton10mousePressed(MouseEvent e) .setForeground(new Color();publicvoidjButton10mouseReleased(Mouse

43、Event e) .setForeground(new Color(););returnjButton10;privateif(JButton getJButton11() jButton11=null) jButton11=new JButton();jButton11.setText("2" );jButton11.setFont(new Font(" 楷體 " , Font.BOLD, 30);jButton11.setForeground(new Color();jButton11.setFocusable(false);jButton11.addActionListener(new ActionListener() publicvoidactionPerformed(ActionE