myconverter.java

本人写的一个非常简单的度量单位换算程序

/*
 * MyConverter.java
 *
 * Created on 03/11/2004
 */

import java.text.DecimalFormat;
import java.text.ParseException;

/**
 *
 * @author  Ben Lin
 */
public class MyConverter extends javax.swing.JFrame {
    
    /** Creates new form MyConverter */
    public MyConverter() {
        conversionFactor = 1.609;
        initComponents();
    }
    
    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    private void initComponents() {//GEN-BEGIN:initComponents
        myButtonGroup = new javax.swing.ButtonGroup();
        textInput = new javax.swing.JFormattedTextField(new DecimalFormat("###.##"));
        try {
            textInput.setText("0.0");
            textInput.commitEdit();
        } catch(ParseException e) {
            //Shouldn't get here unless the setText value doesn't agree
            //with the format set above.
            e.printStackTrace();
        }
        Convert = new javax.swing.JButton();
        Input = new javax.swing.JLabel();
        Output = new javax.swing.JLabel();
        Result = new javax.swing.JLabel();
        Menubar = new javax.swing.JMenuBar();
        File = new javax.swing.JMenu();
        Exit = new javax.swing.JMenuItem();
        Mode = new javax.swing.JMenu();
        Distance = new javax.swing.JRadioButtonMenuItem();
        Volumn = new javax.swing.JRadioButtonMenuItem();
        Weight = new javax.swing.JRadioButtonMenuItem();
        Help = new javax.swing.JMenu();
        About = new javax.swing.JMenuItem();

        getContentPane().setLayout(null);

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        setTitle("My Converter");
        setName("frameMainWindow");
        setResizable(false);
        textInput.setToolTipText("Enter the value you want to convert heref");
        getContentPane().add(textInput);
        textInput.setBounds(170, 70, 140, 23);

        Convert.setFont(new java.awt.Font("Times New Roman", 0, 12));
        Convert.setMnemonic('c');
        Convert.setText("Convert");
        Convert.setToolTipText("Click this button to convert");
        Convert.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                ConvertActionPerformed(evt);
            }
        });

        getContentPane().add(Convert);
        Convert.setBounds(160, 180, 81, 23);

        Input.setHorizontalAlignment(javax.swing.SwingConstants.TRAILING);
        Input.setText("Miles:");
        getContentPane().add(Input);
        Input.setBounds(70, 70, 60, 20);

        Output.setHorizontalAlignment(javax.swing.SwingConstants.TRAILING);
        Output.setText("Kms:");
        getContentPane().add(Output);
        Output.setBounds(70, 110, 60, 20);

        getContentPane().add(Result);
        Result.setBounds(170, 110, 140, 20);

        Menubar.setFont(new java.awt.Font("Times New Roman", 0, 12));
        Menubar.setName("null");
        File.setMnemonic('f');
        File.setText("File");
        Exit.setFont(new java.awt.Font("Times New Roman", 0, 12));
        Exit.setMnemonic('e');
        Exit.setText("Exit");
        Exit.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                ExitActionPerformed(evt);
            }
        });

        File.add(Exit);

        Menubar.add(File);

        Mode.setMnemonic('m');
        Mode.setText("Mode");
        myButtonGroup.add(Distance);
        Distance.setFont(new java.awt.Font("Times New Roman", 0, 12));
        Distance.setMnemonic('d');
        Distance.setSelected(true);
        Distance.setText("Miles to Kms");
        Distance.setToolTipText("Convert miles to kms");
        Distance.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                DistanceActionPerformed(evt);
            }
        });

        Mode.add(Distance);

        myButtonGroup.add(Volumn);
        Volumn.setFont(new java.awt.Font("Times New Roman", 0, 12));
        Volumn.setMnemonic('v');
        Volumn.setText("Pints to Litres");
        Volumn.setToolTipText("Convert pints to litres");
        Volumn.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                VolumnActionPerformed(evt);
            }
        });

        Mode.add(Volumn);

        myButtonGroup.add(Weight);
        Weight.setFont(new java.awt.Font("Times New Roman", 0, 12));
        Weight.setMnemonic('w');
        Weight.setText("Lbs to Kgs");
        Weight.setToolTipText("Convert pounds to kgs");
        Weight.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                WeightActionPerformed(evt);
            }
        });

        Mode.add(Weight);

        Menubar.add(Mode);

        Help.setMnemonic('h');
        Help.setText("Help");
        About.setFont(new java.awt.Font("Times New Roman", 0, 12));
        About.setMnemonic('a');
        About.setText("About");
        About.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                AboutActionPerformed(evt);
            }
        });

        Help.add(About);

        Menubar.add(Help);

        setJMenuBar(Menubar);

        java.awt.Dimension screenSize = java.awt.Toolkit.getDefaultToolkit().getScreenSize();
        setBounds((screenSize.width-400)/2, (screenSize.height-300)/2, 400, 300);
    }//GEN-END:initComponents

    private void AboutActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_AboutActionPerformed
        About dlgAbout = new About(this, true);
        dlgAbout.setVisible(true);     // TODO add your handling code here:
    }//GEN-LAST:event_AboutActionPerformed

    private void ConvertActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_ConvertActionPerformed
        double inputValue;
	    double outputValue;
	
        inputValue = Double.parseDouble(textInput.getText());
        outputValue = conversionFactor * inputValue;
	    Result.setText(String.valueOf(outputValue));        // TODO add your handling code here:
    }//GEN-LAST:event_ConvertActionPerformed

    private void VolumnActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_VolumnActionPerformed
        Input.setText("Pint:");
        Output.setText("Litres:");
        conversionFactor = 0.4732;        // TODO add your handling code here:
    }//GEN-LAST:event_VolumnActionPerformed

    private void DistanceActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_DistanceActionPerformed
        Input.setText("Miles:");
        Output.setText("Kms:");
        conversionFactor = 1.609;        // TODO add your handling code here:
    }//GEN-LAST:event_DistanceActionPerformed

    private void WeightActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_WeightActionPerformed
        Input.setText("Lbs:");
        Output.setText("Kgs:");
        conversionFactor = 0.4536;        // TODO add your handling code here:
    }//GEN-LAST:event_WeightActionPerformed

    private void ExitActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_ExitActionPerformed
        exitApplication();        // TODO add your handling code here:
    }//GEN-LAST:event_ExitActionPerformed
    
    public void exitApplication(){
	setVisible(false);
	dispose();
	System.exit(0);		
    }
    
    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new MyConverter().setVisible(true);
            }
        });
    }
    
    // Variables declaration - do not modify//GEN-BEGIN:variables
    private javax.swing.JMenuItem About;
    private javax.swing.JButton Convert;
    private javax.swing.JRadioButtonMenuItem Distance;
    private javax.swing.JMenuItem Exit;
    private javax.swing.JMenu File;
    private javax.swing.JMenu Help;
    private javax.swing.JLabel Input;
    private javax.swing.JMenuBar Menubar;
    private javax.swing.JMenu Mode;
    private javax.swing.JLabel Output;
    private javax.swing.JLabel Result;
    private javax.swing.JRadioButtonMenuItem Volumn;
    private javax.swing.JRadioButtonMenuItem Weight;
    private javax.swing.ButtonGroup myButtonGroup;
    private javax.swing.JFormattedTextField textInput;
    // End of variables declaration//GEN-END:variables
    
    private double conversionFactor;
}