Java单位转换器程序

Question

我可能已经埋葬了12年级编码项目的漏洞。我正在尝试制作一个可以与各种单位（例如时间，质量，速度，距离等）相互转换的程序。请参见此处的设计。 https://imgur.com/a/VpYj7f1。

我面临的挑战是如何使任何转换成为可能。如果您查看imgur链接，它将更有意义。显然有一个主菜单，每个按钮为每个特定单元打开一个新的Jframe。在这些框架内，我有两个JList，一个用于转换单位，另一个用于转换。在我的示例中，我想将1000克转换为千克，单击转换按钮，然后在另一个文本字段中显示该值。现在我知道1000克等于1千克，但是对于所有其他质量单位，最简单，最合乎逻辑的方法是什么。我看过有关添加因子或其他东西的事情，这些看起来都很耗时。

无论如何，这是Mass Jframe的代码。我正在使用Netbeans的拖放GUI功能，这就是为什么与手动添加所有组件相比，代码看起来可能有所不同的原因。

public class Mass extends javax.swing.JFrame {


public Mass() {
    initComponents();
}


@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">                          
private void initComponents() {

    jButton1 = new javax.swing.JButton();
    jLabel1 = new javax.swing.JLabel();
    btnMenu = new javax.swing.JButton();
    jScrollPane1 = new javax.swing.JScrollPane();
    listConvertFrom = new javax.swing.JList<>();
    jScrollPane2 = new javax.swing.JScrollPane();
    listConvertTo = new javax.swing.JList<>();
    txtConvertFrom = new javax.swing.JTextField();
    txtConvertTo = new javax.swing.JTextField();
    jLabel2 = new javax.swing.JLabel();
    jLabel3 = new javax.swing.JLabel();
    btnConvert = new javax.swing.JButton();
    btnReset = new javax.swing.JButton();

    jButton1.setText("Main mernu");
    jButton1.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            jButton1ActionPerformed(evt);
        }
    });

    setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

    jLabel1.setFont(new java.awt.Font("Tahoma", 1, 48)); // NOI18N
    jLabel1.setText("UNIT OF MASS CONVERTER");

    btnMenu.setText("Main menu");
    btnMenu.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            btnMenuActionPerformed(evt);
        }
    });

    listConvertFrom.setFont(new java.awt.Font("Tahoma", 0, 36)); // NOI18N
    listConvertFrom.setModel(new javax.swing.AbstractListModel<String>() {
        String[] strings = { "Kilogram", "Ounce", "Pound", "Gram", "Milligram", "Tonne" };
        public int getSize() { return strings.length; }
        public String getElementAt(int i) { return strings[i]; }
    });
    jScrollPane1.setViewportView(listConvertFrom);

    listConvertTo.setFont(new java.awt.Font("Tahoma", 0, 36)); // NOI18N
    listConvertTo.setModel(new javax.swing.AbstractListModel<String>() {
        String[] strings = { "Kilogram", "Ounce", "Pound", "Gram", "Milligram", "Tonne" };
        public int getSize() { return strings.length; }
        public String getElementAt(int i) { return strings[i]; }
    });
    jScrollPane2.setViewportView(listConvertTo);

    txtConvertFrom.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            txtConvertFromActionPerformed(evt);
        }
    });

    txtConvertTo.setEditable(false);

    jLabel2.setFont(new java.awt.Font("Tahoma", 1, 24)); // NOI18N
    jLabel2.setText("FROM: ");

    jLabel3.setFont(new java.awt.Font("Tahoma", 1, 24)); // NOI18N
    jLabel3.setText("TO: ");

    btnConvert.setText("CONVERT");
    btnConvert.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            btnConvertActionPerformed(evt);
        }
    });

    btnReset.setText("RESET");
    btnReset.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            btnResetActionPerformed(evt);
        }
    });

    javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
    getContentPane().setLayout(layout);
    layout.setHorizontalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
            .addContainerGap()
            .addComponent(btnMenu, javax.swing.GroupLayout.PREFERRED_SIZE, 153, javax.swing.GroupLayout.PREFERRED_SIZE)
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 36, Short.MAX_VALUE)
            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                    .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addGap(109, 109, 109)
                    .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                        .addComponent(btnConvert, javax.swing.GroupLayout.PREFERRED_SIZE, 153, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addComponent(btnReset, javax.swing.GroupLayout.PREFERRED_SIZE, 153, javax.swing.GroupLayout.PREFERRED_SIZE))
                    .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                    .addComponent(jScrollPane2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addComponent(jLabel1)
                .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                    .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                        .addGroup(layout.createSequentialGroup()
                            .addComponent(jLabel2)
                            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
                        .addGroup(layout.createSequentialGroup()
                            .addComponent(txtConvertFrom, javax.swing.GroupLayout.PREFERRED_SIZE, 146, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)))
                    .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                        .addComponent(jLabel3)
                        .addComponent(txtConvertTo, javax.swing.GroupLayout.PREFERRED_SIZE, 146, javax.swing.GroupLayout.PREFERRED_SIZE))))
            .addGap(189, 189, 189))
    );
    layout.setVerticalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(layout.createSequentialGroup()
            .addContainerGap()
            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
                .addComponent(btnMenu, javax.swing.GroupLayout.PREFERRED_SIZE, 51, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addComponent(jLabel1))
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 29, Short.MAX_VALUE)
            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                .addComponent(jLabel2)
                .addComponent(jLabel3))
            .addGap(18, 18, 18)
            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                .addComponent(txtConvertFrom, javax.swing.GroupLayout.PREFERRED_SIZE, 45, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addComponent(txtConvertTo, javax.swing.GroupLayout.PREFERRED_SIZE, 45, javax.swing.GroupLayout.PREFERRED_SIZE))
            .addGap(32, 32, 32)
            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(jScrollPane1, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.PREFERRED_SIZE, 319, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jScrollPane2, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.PREFERRED_SIZE, 319, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addGroup(layout.createSequentialGroup()
                    .addComponent(btnConvert, javax.swing.GroupLayout.PREFERRED_SIZE, 67, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addGap(65, 65, 65)
                    .addComponent(btnReset, javax.swing.GroupLayout.PREFERRED_SIZE, 67, javax.swing.GroupLayout.PREFERRED_SIZE)))
            .addContainerGap())
    );

    pack();
}// </editor-fold>                        

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
    // HAS NO USE, DISCARD
}                                        

private void btnMenuActionPerformed(java.awt.event.ActionEvent evt) {                                        
    this.dispose ();
    new sat_testing().setVisible(true);
}                                       

private void btnConvertActionPerformed(java.awt.event.ActionEvent evt) {                                           
    // TODO add your handling code here
}                                          

private void txtConvertFromActionPerformed(java.awt.event.ActionEvent evt) {                                               
    // TODO add your handling code here:
}                                              

private void btnResetActionPerformed(java.awt.event.ActionEvent evt) {                                         
    // TODO add your handling code here:
}                                        

/**
 * @param args the command line arguments
 */
public static void main(String args[]) {
    /* Set the Nimbus look and feel */
    //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
    /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
     * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
     */
    try {
        for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
            if ("Nimbus".equals(info.getName())) {
                javax.swing.UIManager.setLookAndFeel(info.getClassName());
                break;
            }
        }
    } catch (ClassNotFoundException ex) {
        java.util.logging.Logger.getLogger(Mass.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (InstantiationException ex) {
        java.util.logging.Logger.getLogger(Mass.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (IllegalAccessException ex) {
        java.util.logging.Logger.getLogger(Mass.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (javax.swing.UnsupportedLookAndFeelException ex) {
        java.util.logging.Logger.getLogger(Mass.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    }
    //</editor-fold>

    /* Create and display the form */
    java.awt.EventQueue.invokeLater(new Runnable() {
        public void run() {
            new Mass().setVisible(true);
        }
    });
}

// Variables declaration - do not modify                     
private javax.swing.JButton btnConvert;
private javax.swing.JButton btnMenu;
private javax.swing.JButton btnReset;
private javax.swing.JButton jButton1;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JLabel jLabel3;
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JScrollPane jScrollPane2;
private javax.swing.JList<String> listConvertFrom;
private javax.swing.JList<String> listConvertTo;
private javax.swing.JTextField txtConvertFrom;
private javax.swing.JTextField txtConvertTo;
// End of variables declaration                   

}