多功能科学计算器（包括进制转换，三角函数，四则运算等）

Basic Framework

calculator.java

package myCalculator;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;public class calculator extends Frame implements ActionListener, WindowListener
{private Container container;private GridBagLayout layout;private GridBagConstraints constraints; private JTextField displayField;         //计算结果显示区private String lastCommand;           //保存+,-,*,/,=命令0private double result;               //保存计算结果private boolean start;           //判断是否为数字的开始private JMenuBar menubar;private JMenuItem m_exit;private JMenuItem m2_ejz;private JMenuItem m2_bjz;private Dialog dialog;private Label label_dialog;private JButton button_sqrt;private JButton button_plusminus;private JButton button_CE;private JButton button_cancel;private JButton button_1;private JButton button_2;private JButton button_3;private JButton button_4;private JButton button_5;private JButton button_6;private JButton button_7;private JButton button_8;private JButton button_9;private JButton button_0;private JButton button_plus;private JButton button_minus;private JButton button_multiply;private JButton button_divide;private JButton button_point;private JButton button_equal;private JButton button_log;private JButton button_tan;private JButton button_cos;private JButton button_sin;private JButton button_exp;public calculator()       //构造方法设置布局、为按钮注册事件监听器{super( "My Calculator" );this.setLocation( 350,150 );this.setSize( 450,400 );this.setResizable( true );this.setLayout( new GridLayout( 7,1 ) );this.addmyMenu();                   //调用成员方法添加菜单displayField = new JTextField( 30 );this.add( displayField );displayField.setEditable( true );start = true;result = 0;lastCommand = "=";JPanel panel0 = new JPanel();panel0.setLayout( new GridLayout( 1,4,4,4 ) );JPanel panel1 = new JPanel();panel1.setLayout( new GridLayout( 1,5,4,4 ) );this.add( panel1 );button_sqrt = new JButton( "sqrt" );//根号button_plusminus = new JButton( "+/-" );button_exp = new JButton( "exp" );//底数e的n次幂button_CE = new JButton( "退位");button_cancel = new JButton( "c" );//清除JPanel panel2 = new  JPanel();panel2.setLayout( new GridLayout( 1,5,4,4 ) );this.add( panel2 );button_7 = new JButton( "7" );button_8 = new JButton( "8" );button_9 = new JButton( "9" );button_log = new JButton( "log" );//对数button_divide = new JButton( "/" );//除JPanel panel3 = new JPanel();panel3.setLayout( new GridLayout(1,5,4,4) );this.add( panel3 );button_4 = new JButton( "4" );button_5 = new JButton( "5" );button_6 = new JButton( "6" );button_tan = new JButton( "tan" );//正切button_multiply = new JButton( "*" );//乘法JPanel panel4=new  JPanel();panel4.setLayout( new GridLayout( 1,5,4,4 ) );this.add(panel4);button_1 = new JButton( "1" );button_2 = new JButton( "2" );button_3 = new JButton( "3" );button_cos = new JButton( "cos");//余弦button_minus = new JButton( "-" );JPanel panel5 = new  JPanel();panel5.setLayout( new GridLayout( 1,5,4,4 ) );this.add( panel5 ); button_0 = new JButton( "0" );button_point=new JButton( "." );button_equal = new JButton( "=" );button_sin = new JButton( "sin" );//正弦button_plus = new JButton( "+" );panel1.add( button_sqrt );panel1.add( button_plusminus );panel1.add( button_exp );panel1.add( button_CE );panel1.add( button_cancel );panel2.add( button_7 );panel2.add( button_8 );panel2.add( button_9 );panel2.add( button_log );panel2.add( button_divide );panel3.add( button_4 );panel3.add( button_5 );panel3.add( button_6 );panel3.add( button_tan );panel3.add( button_multiply );panel4.add( button_1 );panel4.add( button_2 ); panel4.add( button_3 );panel4.add( button_cos );panel4.add( button_minus );panel5.add( button_0 );panel5.add( button_point );panel5.add( button_equal );panel5.add( button_sin );panel5.add( button_plus) ;button_sqrt.addActionListener( this );button_plusminus.addActionListener( this );button_exp.addActionListener( this );button_CE.addActionListener( this );button_cancel.addActionListener( this );button_7.addActionListener( this );button_8.addActionListener( this );button_9.addActionListener( this );button_log.addActionListener( this );button_divide.addActionListener( this );button_4.addActionListener( this );button_5.addActionListener( this );button_6.addActionListener( this );button_tan.addActionListener( this );button_multiply.addActionListener( this );button_1.addActionListener( this );button_2.addActionListener( this );button_3.addActionListener( this );button_cos.addActionListener( this );button_minus.addActionListener( this );button_0.addActionListener( this );button_point.addActionListener( this );button_equal.addActionListener( this );button_sin.addActionListener( this );button_plus.addActionListener( this );this.addWindowListener( new WinClose() );      //注册窗口监听器this.setVisible( true );}private void addmyMenu()        //菜单的添加{   JMenuBar menubar = new JMenuBar(); this.add( menubar );JMenu m1 = new JMenu( "选项" );JMenu m2 = new JMenu( "进制转换" );JMenuItem m1_exit = new JMenuItem( "退出" );m1_exit.addActionListener( this );JMenuItem m2_ejz = new JMenuItem( "二进制" );m2_ejz.addActionListener( this );JMenuItem m2_bjz = new JMenuItem("八进制");m2_bjz.addActionListener( this );JMenuItem m2_sljz = new JMenuItem("十六进制");m2_sljz.addActionListener( this );JMenu m3 = new JMenu( "帮助" ); JMenuItem m3_Help = new JMenuItem( "用法" ); m3_Help.addActionListener( this ); dialog = new Dialog( this, "提示" , true );     //模式窗口dialog.setSize( 240,80 );label_dialog = new Label("", Label.CENTER );   //标签的字符串为空，居中对齐dialog.add( label_dialog ); dialog.addWindowListener( this );          //为对话框注册窗口事件监听器m1.add( m1_exit );  menubar.add( m1 );m2.add( m2_ejz );m2.add( m2_bjz );m2.add( m2_sljz );menubar.add( m2 );m3.add( m3_Help ); menubar.add( m3 );  }public void actionPerformed(ActionEvent e)       //按钮的单击事件处理方法{if(e.getSource().equals( button_1 )||e.getSource().equals( button_2 )|| e.getSource().equals( button_3 )||e.getSource().equals( button_4 )||e.getSource().equals( button_5 )|| e.getSource().equals( button_6 )||e.getSource().equals( button_7 )|| e.getSource().equals( button_8 )||e.getSource().equals( button_9 ) ||e.getSource().equals( button_0 )||e.getSource().equals( button_point )||e.getSource().equals( button_plusminus )||    e.getSource().equals( button_cancel )||e.getSource().equals( button_CE )){      //非运算符的处理方法String input = e.getActionCommand();if ( start ){displayField.setText("");start = false;if( input.equals( "+/-" ) )displayField.setText( displayField.getText()+ "-" ); }if( !input.equals( "+/-" ) ){String str = displayField.getText();if( input.equals( "退格" ) )          //退格键的实现方法{       if( str.length() > 0 )displayField.setText( str.substring( 0,str.length() - 1 ) );}else if( input.equals( "C" ) )         //清零键的实现方法{displayField.setText( "0" );start = true;}   elsedisplayField.setText( displayField.getText() + input );}}else if ( e.getActionCommand() == "二进制" )   //二进制的转换{int n = Integer.parseInt( displayField.getText() );displayField.setText( Integer.toBinaryString( n ) );}else if ( e.getActionCommand() == "八进制" )    //八进制的转换{int n = Integer.parseInt( displayField.getText() );displayField.setText( Integer.toOctalString( n ) );}else if ( e.getActionCommand() == "十六进制" )    //十六进制的转换{int n = Integer.parseInt( displayField.getText() );displayField.setText( Integer.toHexString( n ) );}else if ( e.getActionCommand() == "退出" )      //选项中退出的处理方法{System.exit( 0 );}else if ( e.getActionCommand() == "用法" )      //按下'帮助'菜单栏中用法的处理方法{   label_dialog.setText( "sqrt,exp等键是先输运算符再输数字\n" ); dialog.setLocation( 400,250 );dialog.setVisible( true );  }else        //各运算符的识别{String command = e.getActionCommand();        if( start ){lastCommand = command;}else{calculate( Double.parseDouble( displayField.getText() ) );lastCommand = command;start = true;}}}public void calculate( double x )          //各运算符的具体运算方法{double d = 0;if ( lastCommand.equals( "+" ) ) result += x;    else if (lastCommand.equals( "-" ) ) result -= x;else if ( lastCommand.equals( "*" ) ) result *= x;   else if ( lastCommand.equals( "/" ) ) result /= x;else if ( lastCommand.equals( "=" ) ) result = x;else if ( lastCommand.equals( "sqrt" ) ) {d = Math.sqrt( x );result = d;}else if ( lastCommand.equals( "exp" ) ){d = Math.exp( x );result = d;}else if ( lastCommand.equals( "log" ) ){d = Math.log( x );result = d;}else if ( lastCommand.equals( "tan" ) ){d = Math.tan(x);result = d;}else if ( lastCommand.equals( "cos" ) ){d = Math.cos( x );result = d;}else if ( lastCommand.equals( "sin" ) ){d = Math.sin( x );result = d;}displayField.setText( ""+ result );}   public void windowClosing( WindowEvent e ){if( e.getSource() == dialog )dialog.setVisible( false );           //隐藏对话框elseSystem.exit( 0 ); }public void windowOpened( WindowEvent e )         {  }public void windowActivated( WindowEvent e )      {  }public void windowDeactivated( WindowEvent e )    {  }public void windowClosed( WindowEvent e )         {  }public void windowIconified( WindowEvent e )      {  }public void windowDeiconified( WindowEvent e )    {  }public static void main( String args[] )          {calculator calculator = new calculator();}
}class WinClose implements WindowListener
{public void windowClosing( WindowEvent e )    //单击窗口关闭按钮时触发并执行实现窗口监听器接口中的方法{System.exit( 0 );          //结束程序运行}public void windowOpened( WindowEvent e ){ }public void windowActivated( WindowEvent e ){}public void windowDeactivated( WindowEvent e){ }public void windowClosed( WindowEvent e ){ }public void windowIconified( WindowEvent e ){ }public void windowDeiconified( WindowEvent e ){ }
}

Running Effect

Source Download

Please click the address->My Calculator

Summarize

运用两个面板的叠加做出界面。
通过在按钮的单击事件处理方法中调用类的成员方法calculate（）来进行简易计算器的各种运算，并正确实现运算功能。
调用Math包中的方法实现各函数功能。
添加菜单条，列出‘选项’、‘进制转换’、‘帮助’等菜单选项，并分别实现‘选项’中‘退出’的功能，通过调用Integer包中的方法实现二进制、八进制、十六进制的转换，‘帮助’菜单栏中‘用法’的提示对话框。
整个程序对话框可实现最小化、最大化、关闭。

原文地址：www.iooy.com

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java实现多功能科学计算器（包括进制转换，三角函数，四则运算等）

Basic Framework

calculator.java

Running Effect

Source Download

Summarize

原文地址：www.iooy.com

java实现多功能科学计算器（包括进制转换，三角函数，四则运算等）相关推荐

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