科学计算器程序Java代码

1、实用文档功能举例：源程序如下：import java.awt.BorderLayout;import java.awt.Color;import java.awt.Dimension;import java.awt.Font;import java.awt.GridLayout;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.text.DecimalFormat;import javax.swing.BorderFactory;import javax.swing.Button

2、Group;import javax.swing.JButton;import javax.swing.JCheckBoxMenuItem;import javax.swing.JFrame;import javax.swing.JMenu;import javax.swing.JMenuBar;import javax.swing.JMenuItem;import javax.swing.JPanel;import javax.swing.JRadioButtonMenuItem;import javax.swing.JTextField;public class Calucator ext

3、ends JFrame private JTextField tf ;private JPanel panel1 , panel2 , panel3 , panel4 ;privateJMenuBar myBar;privateJMenu menu1, menu2menu3privateJMenuItem editItem1,editItem2,help1 ,privateJRadioButtonMenuItemseeItem1,seeItem2privateJCheckBoxMenuItem seeItem3 ; /复选框privateButtonGroup bgb;privateStrin

4、g back;privateboolean IfResult =true , flag=false ;privateString oper =;privatedouble result = 0;privateNum numActionListener;privateDecimalFormat df;publicCalucator()super （科学计算器）;/设置标题栏help2 , help3 ;/单选框df = new DecimalFormat( #.# ); / 保留四位小数panel1 =panel2 =panel3 =panel4 =new JPanel( new JPanel(

5、 new JPanel( new JPanel(this .setLayout( new BorderLayout(10, 5);new GridLayout(1, 3, 10, 10);new GridLayout(5, 6, 5, 5);115 行6列new GridLayout(5, 1,5, 5);new BorderLayout(5, 5);/*菜单栏*/myBar =menu1 =menu2=menu3=new JMenuBar();new JMenu(编辑(E);new JMenu(查看(V);new JMenu(帮助(H);menu1.setFont(menu2setFont(

6、menu3setFont(new Font( new Font( new Font(宋体,Font.宋体,Font.宋体,Font.PLAIN 12);PLAIN 12);PLAIN 12);文案大全/*编辑栏*/editltemleditItem2new JMenuItem(复制(C) Ctrl+C);new JMenuItem(粘贴(P) Ctrl+V);editItem1 .setFont( new Font(宋体，Font. PLAIN12);editItem2 .setFont( new Font(宋体，Font. PLAIN12);* 查看栏* /seelteml = new JR

7、adioButtonMenuItem(科学型(T);seeItem2 = new JRadioButtonMenuItem(标准型(S);seeItem3 = new JCheckBoxMenuItem(数字分组(I);seelteml .setFont( new Font(宋体,Font. PLAIN12);seeItem2 .setFont( new Font(宋体,Font. PLAIN12); seeItem3 .setFont( new Font(宋体,Font. PLAIN12);/* 帮助栏* /helpl = new JMenuItem(帮助主题(H);help2 = new

8、JMenuItem(关于计算器(A);help1 .setFont( new Font(宋体,Font. PLAIN12); help2 .setFont( new Font(宋体,Font. PLAIN12);bgb = new ButtonGroup(); / 选项组menu1.add( editItem1 );menu1.add( editItem2 );menu2add( seeItem1 );menu2add( seeItem2 );menu2addSeparator(); / 添加一条分割线menu2add( seeItem3 );menu3add( help1 );menu3ad

9、dSeparator(); / 添加一条分割线menu3add( help2 );myBar.add( menu1);myBar.add( menu2);myBar.add( menu3);this .setJMenuBar( myBar);numActionListener = new Num(); / 实现数字监听/*文本域，即为计算器的屏幕显示区域*/tf = new JTextField();tf .setEditable( false ); /文本区域不可编辑tf .setBackground(Color. white ); / 文本区域的背景色tf .setHorizontalAl

10、ignment(JTextField.RIGHT 文字右对齐tf .setText( 0);tf .setBorder(BorderFactory. createLoweredBevelBorder ();init(); /对计算器进行初始化/*初始化操作 添加按钮*/private void init()addButton( panel1 ,addButton( panel1 ,addButton( panel1 ,Backspace , new Clear(), Color.redCE, new Clear(), Color.red);C, new Clear(), Color.red);

11、addButton( panel2 ,1/x , new Signs(), Color.magenta);addButton( panel2 ,log , new Signs(), Color.magenta);addButton( panel2 ,7 , numActionListener , Color. blue);addButton( panel2 ,8 , numActionListener , Color. blue);addButton( panel2 ,9 , numActionListener , Color. blue);addButton( panel2 ,+ , new

12、 Signs(), Color.red);addButton( panel2 ,n! , new Signs(), Color.magent;addButton( panel2 ,sqrt , new Signs(), Color.magenta;addButton( panel2 ,4 , numActionListener , Color. blue);addButton( panel2 ,5 , numActionListener , Color. blue);addButton( panel2 ,6 , numActionListener , Color. blue);addButto

13、n( panel2 ,x , new Signs(), Color.red);addButton( panel2 ,sin , new Signs(), Color.magenta);addButton( panel2 ,xA2 , new Signs(), Color.magenta);addButton( panel2 ,1, numActionListener , Color. blue);addButton( panel2 ,2 , numActionListener , Color. blue);addButton( panel2 ,3 , numActionListener , C

14、olor. blue);addButton( panel2 ,-,new Signs(), Color.red);addButton( panel2 ,cos , new Signs(), Color.magenta);addButton( panel2 ,xA3 , new Signs(), Color.magenta);addButton( panel2 ,0 , numActionListener , Color. blue);addButton(panel2 ,-/+”,new Clear(), Color.blue);addButton(panel2 ,.new Dot(), Col

15、or.blue);addButton(panel2 ,+,new Signs(), Color.red);addButton(panel2 ,tan,new Signs(), Color.magenta);addButton(panel2 ,%,new Signs(), Color.magenta*;addButton(panel2 ,兀numActionListener,Color.orange);addButton(panel2 ,e,numActionListener,Color. orange);addButton(panel2 ,new Signs(), Color. orange)

16、;addButton(panel2 ,new Signs(), Color.red);JButton btns = new JButton(计算器)； btns.setBorder(BorderFactory. createLoweredBevelBorder (); btns.setEnabled( false ); / 按钮不可操作 btns.setPreferredSize( new Dimension(20, 20);panel3 .add(btns); / 加入按钮addButton( panel3 ,MC, null , Color.red);addButton( panel3 ,

17、MR, null , Color.red);addButton( panel3 ,MS, null , Color.red);addButton( panel3 ,M+, null , Color.red);panel4 .add( panel1 , BorderLayout.NORT)Hpanel4 .add( panel2 , BorderLayout.CENTE)Rthis .add( tf , BorderLayout. NORTHthis .add( panel3 , BorderLayout. WESTthis .add( panel4 );pack();this .setResi

18、zable( false ); / 窗口不可改变大小this .setLocation(300, 200);this .setDefaultCloseOperation(JFrame. EXIT_ON_CLOSE/* 统一设置按钮的的使用方式* parampanel* paramname* paramaction* paramcolor* /private void addButton(JPanel panel, String name, ActionListener action, Color color)JButton bt = new JButton(name);panel.add(bt

19、); /在面板上增加按钮bt.setForeground(color); /设置前景(字体)颜色/*bt.addActionListener(action); / 增加监听事件计算器的基础操作（+ - x +） paramx*/ private void getResult ( double x)if (oper=+) result += x;else if(oper = - ) result -= x;else if(oper = x ) result *= x;else if(oper = + ) result /= x;else if(oper = = ) result = x;tf .

20、setText( df .format( result );/*运算符号的事件监听*/class Signs implements ActionListenerpublic void actionPerformed(ActionEvent e) /* 用 ActionEvent 对象的 getActionCommand()方法* 取得与引发事件对象相关的字符串* /String str = e.getActionCommand();/* sqrt求平方根*/if (str.equals( sqrt )double i = Double. parseDouble( tf .getText();i

21、f (i=0)/* String.valueOf() 转换为字符串* df.format()按要求保留四位小数* Math.sqrt()求算数平方根* /tf .setText(String. valueOf (df .format(Math. sqrt (i); else tf .setText(负数不能开平方根”)；/* log求常用对数*/ else if (str.equals( log )double i = Double.parseDouble( tf .getText();if (i0)tf .setText(String. valueOf (df .format(Math. l

22、og (i);else tf .setText(负数不能求对数)；/* %求百分比*/else if (str.equals( %)tf .setText( df .format(Double. parseDouble(tf .getText() / 100);/* 1/x求倒数*/else if (str.equals( 1/x )if (Double. parseDouble(tf .getText() = 0)tf .setText(除数不能为零);else tf .setText( df .format。/ Double. parseDouble( tf .getText();/* s

23、in 求正弦函数*/else if (str.equals( sin )double i = Double.parseDouble( tf .getText();tf .setText(String. valueOf (df .format(Math. sin (i);/* cos求余弦函数*/else if (str.equals( cos )double i = Double.parseDouble( tf .getText();tf .setText(String. valueOf (df .format(Math.cos(i);/* tan求正切函数*/else if (str.equ

24、als( tan )double i = Double.parseDouble( tf .getText();tf .setText(String. valueOf (df .format(Math. tan (i);/* n!求阶乘*/else if (str.equals( n! )double i = Double.parseDouble( tf .getText();if (i%2=0)|(i%2=1)/判断为整数放进行阶乘操作int j = ( int )i; /强制类型转换int result=1;for (int k=1;k 0)if (tf .getText().length() 1)tf .setText( tf .getText().substring(0, tf .getText().length() -1);/使用退格删除最后一位字符else tf .setText( 0); IfResult = true ;else if (tf .getText().length() 2)tf .setText(