java吕磊课程设计计算器3科学计算器

1、import javax.swing.*;/ 把 javax包里面的swing包里面的 所有东西 引进来import java.awt.*;/ 导入awt包里的所有java类import java.awt.event.*;/导入包eventimport java.text.DecimalFormat;/ 处理文本、日期、数字和消息的类和接口import java.text.SimpleDateFormat;import java.util.Calendar;import java.util.Date;import java.util.GregorianCalendar;import java.

2、awt.BasicStroke;import java.awt.BorderLayout;import java.awt.Color;import java.awt.Dimension;import java.awt.Font;import java.awt.Graphics;import java.awt.Graphics2D;import java.awt.GridLayout;import java.awt.Image;import java.awt.Toolkit;import java.awt.event.ActionEvent;import java.awt.event.Actio

3、nListener;import java.awt.geom.Ellipse2D;import java.awt.geom.Line2D;import java.awt.geom.Point2D;public class biaozhunjisuanqi extends JFrame implements ActionListener / public代表该类公有/class声明一个类/ biaozhunjisuanqi为类名/ extends 是继承类/implements代表实现接口/窗体名称biaozhunjisuanqi继承JFrame类和ActionListener接口，并实现pub

4、lic void actionPerformed(ActionEvent e)方法private static final long serialVersionUID = 1L;/ serialVersionUID相当于java类的身份证, 默认为1L, serialVersionUID作用是序列化时保持版本的兼容性，即在版本升级时反序列化仍保持对象的唯一性private JPanel jContentPane = null; / 创建面板对象, null代表为这些变量赋初值为空，即不分配内存空间，变量不指向任何地址。private是访问控制符，代表这些变量的访问级别为私有，私有级别只能在当前

5、类中进行访问, 这些（JPanel 、JTextArea 、JPanel、 JButton ）是java中AWT（包）中的类，用能进行桌面级应用程序的开发，就像平时用的word，上面有各种文本框，菜单栏，工具栏按钮等等，这些都是对象private JPanel jPanel = null; /JPanel 作为一个容器，可以包容一些组件，然后将这个 JPanel 对象作为一个组件添加到另一个容器 (称作父容器) 中private JButton jButton = null; /9 JButton是用户进行计算时主要的使用工具，一般为其添加actionPerformed事件。private J

6、Button jButton1 = null;/ (/)private JButton jButton2 = null;/(sqrt)private JButton jButton3 = null;/(4)private JButton jButton4 = null;/(5)private JButton jButton5 = null;/(6)private JButton jButton6 = null;/(*)private JButton jButton7 = null;/(%)private JButton jButton8 = null;/(1)private JButton j

7、Button9 = null;/(7)private JButton jButton10 = null;/(8)private JButton jButton11 = null;/(2)private JButton jButton12 = null;/(3)private JButton jButton13 = null;/(-)private JButton jButton14 = null;/(1/x)private JButton jButton15 = null;/(0)private JButton jButton16 = null;/(+/-)private JButton jB

8、utton17 = null;/(.)private JButton jButton18 = null;/(+)private JButton jButton19 = null;/(=)private JTextField jTextField = null;/ JTextField是一个的文本框private JTextField textMemory= null;/作为输入M用private JButton jButton20 = null;/(MC)private JButton jButton21 = null;/(MR)private JButton jButton22 = null

9、;/(MS)private JButton jButton23 = null;/(M+)private JButton jButton24 = null;/(Backspace)private JButton jButton25 = null;/(CE)private JButton jButton26 = null;/(C)double memoryd; /使用内存中存储的数字int memoryi;/科学计算器按钮private JButton jButton31 = null;/(十六进制)private JButton jButton32 = null;/(sin)private JB

10、utton jButton33 = null;/(cos)private JButton jButton34 = null;/(十进制)private JButton jButton35 = null;/(tan)private JButton jButton36 = null;/(弧度)private JButton jButton37 = null;/(八进制)private JButton jButton38 = null;/(X2)private JButton jButton39 = null;/(X3)private JButton jButton40 = null;/(二进制)p

11、rivate JButton jButton41 = null;/(Xy)private JButton jButton42 = null;/(n!)private JButton jButton43 = null;/(Pi)private JButton jButton44 = null;/(ln)private JButton jButton45 = null;/(log10)/A-Fprivate JButton jButton46 = null;/(A)private JButton jButton47 = null;/(B)private JButton jButton48 = nu

12、ll;/(C)private JButton jButton49 = null;/(D)private JButton jButton50 = null;/(E)private JButton jButton51 = null;/(F)private JPanel jPanel1 = null;private JPanel jContentPane1 = null;private String str=; /声明私有字符串变量strprivate double dataone;/变量名用来存储运算的数据private char Operator=A; /存放运算符private boolean

13、 pointIsTyped=false; /判断输入的数据是否是小数private JMenuBar jJMenuBar = null;private JMenu jMenu = null;/ JMenu定义菜单 编辑键private JMenuItem jMenuItem = null;/ JMenuItem菜单中项的实现 复制（Ctrl+C）private JMenuItem jMenuItem1 = null;/粘贴（Ctrl+V）private JMenu jMenu1 = null;/定义查看菜单private JMenuItem jMenuItem3 = null;/帮助主题pri

14、vate JMenuItem jMenuItem4 = null;/关于计算器private JMenu jMenu2 = null;/定义帮助菜单private JMenuItem jMenuItem5 = null;/标准型private JMenuItem jMenuItem6 = null;/科学型private JMenuItem jMenuItem7 = null;/勾股定理private JMenuItem jMenuItem8 = null;/解一元二次方程DecimalFormat df;/保留小数位数private JButton getJButton() /使用priva

15、te JButton getJButton()方法添加按钮并给按钮命名if (jButton = null) jButton = new JButton();jButton.setText(9);jButton.setFont(new Font(楷体, Font.BOLD, 30);/ 使用jButton.setFont(new Font(楷体, Font.BOLD, 30)方法设置按钮的字体jButton.setForeground(new Color(250,0,0); /使用方法设置按钮的字体颜色红色、绿色和蓝色jButton.setFocusable(false);jButton.ad

16、dActionListener(new ActionListener() /相当于声明了一个实现了ActionListener接口的对象.(因为可以看到其中的方法都被重写实现了.)更多具体细节,可以参考java 匿名类的使用,就是把对象jButton 注册给事件监听者new ActionListener() Public void actionPerformed(ActionEvent ae) 说明一下new ActionListener() Public void actionPerformed(ActionEvent )是一个匿名内部类，用来实现对动作事件的处理public void ac

17、tionPerformed(ActionEvent e) /这是 ActionListener 中定义的方法，事件监听器,当定义的事件捕获以后就会执行这个方法里面的代码str+=9;jTextField.setText(str);/jTextField是api(Application Program Interface应用程序接口)里面得一个文本主键，要掉用它就要import实现接口,jtextfield文本框.用来建立文本框的，用户可以在文本框输入单行的文本。在Java Swing中的加“J”字头的文本输入框包括两种，单行文本输入框(jtextfield)和多行文本输入框(JTextArea

18、)。);/单击后变色jButton.addMouseListener(new MouseListener()/设置数字按钮1到9并添加监控，使其在发生鼠标事件时改变按钮颜色public void actionPerformed(MouseEvent e) /这是 MouseListener 中定义的方法，java 的事件监听器的一个，例如点击按钮、文本框里按下回车，就会调用这个里面的方法。jButton.setForeground(new Color(0,100,0);/Foreground指前背景色public void mouseClicked(MouseEvent e) /鼠标单击方法

19、(鼠标点击后)jButton.setForeground(new Color(0,150,100);public void mouseEntered(MouseEvent e) /鼠标进入组件方法(鼠标进入某个区域后)jButton.setForeground(new Color(0,0,250);public void mouseExited(MouseEvent e) /鼠标退出组件方法(鼠标离开某个区域后)jButton.setForeground(new Color(250,0,0);public void mousePressed(MouseEvent e) /鼠标按键按下后jBut

20、ton.setForeground(new Color(0,250,0);public void mouseReleased(MouseEvent e) /被按住的鼠标按键释放后jButton.setForeground(new Color(250,250,0););return jButton;private JButton getJButton1() /注册按钮if (jButton1 = null) jButton1 = new JButton();/实例化一个对象,给按钮添中符合.jButton1.setText(/);jButton1.setFont(new Font(楷体, Fon

21、t.BOLD, 30);jButton1.setForeground(new Color(0,150,100);jButton1.addActionListener(new ActionListener() /给jButton1添加一个事件侦听器new ActionListener(),当jButton被按下的时候，所需要发生的事情定义在new ActionListener()里public void actionPerformed(ActionEvent e) str=jTextField.getText();Operator=/;dataone=Double.parseDouble(str

22、);/表示将转换好的Double类型的数值赋值给dataone类str=;jTextField.setText(str););return jButton1;private JButton getJButton2() if (jButton2 = null) jButton2 = new JButton(sqrt);/开根号运算，定义jButton2 = new JButton(sqrt);对其设置监控，调用Math.sqrt()方法来实现开根号运算，并在文本框中输出结果jButton2.setFont(new Font(楷体, Font.BOLD, 30);/Font字体的意思，楷体，加粗，

23、字体号大小30jButton2.setForeground(new Color(0,0,200); jButton2.addActionListener(new ActionListener() public void actionPerformed(ActionEvent e) double a=Double.parseDouble(jTextField.getText();/表示将转换好的Double类型的数值赋值给double类型的变量。double b;if(a0)jTextField.setText(负数不能开平方);elseb=Math.sqrt(a);jTextField.set

24、Text(Double.toString(b);/Double.toString(next() 将这个数 double 数转化成 String 类型 （字符串）);return jButton2;private JButton getJButton3() if (jButton3 = null) jButton3 = new JButton();jButton3.setText(4);jButton3.setFont(new Font(楷体, Font.BOLD, 30);jButton3.setForeground(new Color(250,0,0);jButton3.setFocusab

25、le(false);jButton3.addActionListener(new ActionListener() public void actionPerformed(ActionEvent e) str+=4;jTextField.setText(str););jButton3.addMouseListener(new MouseListener()public void actionPerformed(MouseEvent e) jButton3.setForeground(new Color(0,100,0);public void mouseClicked(MouseEvent e

26、) jButton3.setForeground(new Color(0,150,100);public void mouseEntered(MouseEvent e) jButton3.setForeground(new Color(0,0,250);public void mouseExited(MouseEvent e) jButton3.setForeground(new Color(250,0,0);public void mousePressed(MouseEvent e) jButton3.setForeground(new Color(0,250,0);public void

27、mouseReleased(MouseEvent e) jButton3.setForeground(new Color(250,250,0););return jButton3;private JButton getJButton4() if (jButton4 = null) jButton4 = new JButton();jButton4.setText(5);jButton4.setFont(new Font(楷体, Font.BOLD, 30);jButton4.setForeground(new Color(250,0,0);jButton4.setFocusable(false

28、);jButton4.addActionListener(new ActionListener() public void actionPerformed(ActionEvent e) str+=5;jTextField.setText(str););jButton4.addMouseListener(new MouseListener()public void actionPerformed(MouseEvent e) jButton4.setForeground(new Color(0,100,0);public void mouseClicked(MouseEvent e) jButto

29、n4.setForeground(new Color(0,150,100);public void mouseEntered(MouseEvent e) jButton4.setForeground(new Color(0,0,250);public void mouseExited(MouseEvent e) jButton4.setForeground(new Color(250,0,0);public void mousePressed(MouseEvent e) jButton4.setForeground(new Color(0,250,0);public void mouseRel

30、eased(MouseEvent e) jButton4.setForeground(new Color(250,250,0););return jButton4;private JButton getJButton5() if (jButton5 = null) jButton5 = new JButton();jButton5.setText(6);jButton5.setFont(new Font(楷体, Font.BOLD, 30);jButton5.setForeground(new Color(250,0,0);jButton5.setFocusable(false);jButto

31、n5.addActionListener(new ActionListener() public void actionPerformed(ActionEvent e) str+=6;jTextField.setText(str););jButton5.addMouseListener(new MouseListener()public void actionPerformed(MouseEvent e) jButton5.setForeground(new Color(0,100,0);public void mouseClicked(MouseEvent e) jButton5.setFo

32、reground(new Color(0,150,100);public void mouseEntered(MouseEvent e) jButton5.setForeground(new Color(0,0,250);public void mouseExited(MouseEvent e) jButton5.setForeground(new Color(250,0,0);public void mousePressed(MouseEvent e) jButton5.setForeground(new Color(0,250,0);public void mouseReleased(Mo

33、useEvent e) jButton5.setForeground(new Color(250,250,0););return jButton5;private JButton getJButton6() if (jButton6 = null) jButton6 = new JButton();jButton6.setText(*);jButton6.setFont(new Font(楷体, Font.BOLD, 30);jButton6.setForeground(new Color(0,150,100);jButton6.addActionListener(new ActionList

34、ener() public void actionPerformed(ActionEvent e) str=jTextField.getText();Operator=*;dataone=Double.parseDouble(str);str=;jTextField.setText(str););return jButton6;private JButton getJButton7() if (jButton7 = null) jButton7 = new JButton(%);/设置百分比按钮，jButton7 = new JButton(%);使用变量i1来存放从文本框中读出的数据并转换成

35、double类型，定义double类型变量z1，z1=i1/100实现求百分比运算，在使用jTextField.setText(Double.toString(z1)使其在文本框中输出结果jButton7.setFont(new Font(楷体, Font.BOLD, 30);jButton7.setForeground(new Color(0,0,200); jButton7.addActionListener(new ActionListener() public void actionPerformed(ActionEvent e) double i1=Double.parseDoubl

36、e(jTextField.getText();double z1=i1/100;jTextField.setText(Double.toString(z1););return jButton7;private JButton getJButton8() if (jButton8 = null) jButton8 = new JButton();jButton8.setText(1);jButton8.setFont(new Font(楷体, Font.BOLD, 30);jButton8.setForeground(new Color(250,0,0);jButton8.setFocusabl

37、e(false);jButton8.addActionListener(new ActionListener() public void actionPerformed(ActionEvent e) str+=1;jTextField.setText(str););jButton8.addMouseListener(new MouseListener()public void actionPerformed(MouseEvent e) jButton8.setForeground(new Color(0,100,0);public void mouseClicked(MouseEvent e)

38、 jButton8.setForeground(new Color(0,150,100);public void mouseEntered(MouseEvent e) jButton8.setForeground(new Color(0,0,250);public void mouseExited(MouseEvent e) jButton8.setForeground(new Color(250,0,0);public void mousePressed(MouseEvent e) jButton8.setForeground(new Color(0,250,0);public void m

39、ouseReleased(MouseEvent e) jButton8.setForeground(new Color(250,250,0););return jButton8;private JButton getJButton9() if (jButton9 = null) jButton9 = new JButton();jButton9.setText(7);jButton9.setFont(new Font(楷体, Font.BOLD, 30);jButton9.setForeground(new Color(250,0,0);jButton9.setFocusable(false)

40、;jButton9.addActionListener(new ActionListener() public void actionPerformed(ActionEvent e) str+=7;jTextField.setText(str););jButton9.addMouseListener(new MouseListener()public void actionPerformed(MouseEvent e) jButton9.setForeground(new Color(0,100,0);public void mouseClicked(MouseEvent e) jButton

41、9.setForeground(new Color(0,150,100);public void mouseEntered(MouseEvent e) jButton9.setForeground(new Color(0,0,250);public void mouseExited(MouseEvent e) jButton9.setForeground(new Color(250,0,0);public void mousePressed(MouseEvent e) jButton9.setForeground(new Color(0,250,0);public void mouseRele

42、ased(MouseEvent e) jButton9.setForeground(new Color(250,250,0););return jButton9;private JButton getJButton10() if (jButton10 = null) jButton10 = new JButton();jButton10.setText(8);jButton10.setFocusable(false);jButton10.setFont(new Font(楷体, Font.BOLD, 30);jButton10.setForeground(new Color(250,0,0);

43、jButton10.addActionListener(new ActionListener() public void actionPerformed(ActionEvent e) str+=8;jTextField.setText(str););jButton10.addMouseListener(new MouseListener()public void actionPerformed(MouseEvent e) jButton10.setForeground(new Color(0,100,0);public void mouseClicked(MouseEvent e) jButt

44、on10.setForeground(new Color(0,150,100);public void mouseEntered(MouseEvent e) jButton10.setForeground(new Color(0,0,250);public void mouseExited(MouseEvent e) jButton10.setForeground(new Color(250,0,0);public void mousePressed(MouseEvent e) jButton10.setForeground(new Color(0,250,0);public void mou

45、seReleased(MouseEvent e) jButton10.setForeground(new Color(250,250,0););return jButton10;private JButton getJButton11() if (jButton11 = null) jButton11 = new JButton();jButton11.setText(2);jButton11.setFont(new Font(楷体, Font.BOLD, 30);jButton11.setForeground(new Color(250,0,0);jButton11.setFocusable

46、(false);jButton11.addActionListener(new ActionListener() public void actionPerformed(ActionEvent e) str+=2;jTextField.setText(str););jButton11.addMouseListener(new MouseListener()public void actionPerformed(MouseEvent e) jButton11.setForeground(new Color(0,100,0);public void mouseClicked(MouseEvent

47、e) jButton11.setForeground(new Color(0,150,100);public void mouseEntered(MouseEvent e) jButton11.setForeground(new Color(0,0,250);public void mouseExited(MouseEvent e) jButton11.setForeground(new Color(250,0,0);public void mousePressed(MouseEvent e) jButton11.setForeground(new Color(0,250,0);public

48、void mouseReleased(MouseEvent e) jButton11.setForeground(new Color(250,250,0););return jButton11;private JButton getJButton12() if (jButton12 = null) jButton12 = new JButton();jButton12.setText(3);jButton12.setFont(new Font(楷体, Font.BOLD, 30);jButton12.setForeground(new Color(250,0,0);jButton12.setF

49、ocusable(false);jButton12.addActionListener(new ActionListener() public void actionPerformed(ActionEvent e) str+=3;jTextField.setText(str););jButton12.addMouseListener(new MouseListener()public void actionPerformed(MouseEvent e) jButton12.setForeground(new Color(0,100,0);public void mouseClicked(MouseEvent e) jButton12.setForeground(new Color(0,150,100);public void mouseEntered(MouseEvent e) jButton12.setForeground(new Color(0,0