Java时钟问题

我试图在我的代码中实现以下内容：

每次我设置报警并单击“设置报警”时，我从下拉列表中选择的前导零不会注册到报警旁边的JLabel中。只有数字显示出来。我怎样才能解决这个问题

更新代码：

package hw4;

import java.awt.Color;
import java.awt.Font;
import javax.swing.JColorChooser;
import javax.swing.UIManager;
import javax.swing.JOptionPane;

public class TypeAlarmClock extends javax.swing.JFrame {

/**
 * Creates new form TypeAlarmClock
 */
public TypeAlarmClock() {
    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.
 */
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">                          
private void initComponents() {

    jLabel1 = new javax.swing.JLabel();
    jLabel2 = new javax.swing.JLabel();
    jLabel3 = new javax.swing.JLabel();
    jLabel4 = new javax.swing.JLabel();
    jLabel5 = new javax.swing.JLabel();
    jLabel6 = new javax.swing.JLabel();
    jTextField1 = new javax.swing.JTextField();
    jTextField2 = new javax.swing.JTextField();
    jButton1 = new javax.swing.JButton();
    jLabel7 = new javax.swing.JLabel();
    jToggleButton1 = new javax.swing.JToggleButton();
    jLabel8 = new javax.swing.JLabel();
    jLabel9 = new javax.swing.JLabel();
    jLabel10 = new javax.swing.JLabel();
    jLabel11 = new javax.swing.JLabel();
    jLabel12 = new javax.swing.JLabel();
    jLabel13 = new javax.swing.JLabel();
    jButton2 = new javax.swing.JButton();
    jMenuBar1 = new javax.swing.JMenuBar();
    jMenu1 = new javax.swing.JMenu();
    jMenuItem1 = new javax.swing.JMenuItem();
    jSeparator1 = new javax.swing.JPopupMenu.Separator();
    jMenuItem2 = new javax.swing.JMenuItem();

    setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
    setTitle("Type Alarm Clock");

    jLabel1.setText("Clock:");

    jLabel2.setText("Alarm ON");

    jLabel3.setText("Alarm OFF");

    jLabel4.setText("Set Alarm:");

    jLabel5.setText("Hours");

    jLabel6.setText("Minutes");

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

    jLabel7.setText("Alarm:");

    jToggleButton1.setText("Alarm On/Off");
    jToggleButton1.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            jToggleButton1ActionPerformed(evt);
        }
    });

    jLabel8.setFont(new java.awt.Font("Tahoma", 1, 11)); // NOI18N
    jLabel8.setHorizontalAlignment(javax.swing.SwingConstants.CENTER);
    jLabel8.setText("10    :");

    jLabel9.setFont(new java.awt.Font("Tahoma", 1, 11)); // NOI18N
    jLabel9.setHorizontalAlignment(javax.swing.SwingConstants.CENTER);
    jLabel9.setText("09    :");

    jLabel10.setFont(new java.awt.Font("Tahoma", 1, 11)); // NOI18N
    jLabel10.setHorizontalAlignment(javax.swing.SwingConstants.CENTER);
    jLabel10.setText("00");

    jLabel11.setText(":");

    jButton2.setText("Reset");
    jButton2.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            jButton2ActionPerformed(evt);
        }
    });

    jMenu1.setText("Options");

    jMenuItem1.setText("Change background color");
    jMenuItem1.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            jMenuItem1ActionPerformed(evt);
        }
    });
    jMenu1.add(jMenuItem1);
    jMenu1.add(jSeparator1);

    jMenuItem2.setText("Change font");
    jMenuItem2.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            jMenuItem2ActionPerformed(evt);
        }
    });
    jMenu1.add(jMenuItem2);

    jMenuBar1.add(jMenu1);

    setJMenuBar(jMenuBar1);

    javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
    getContentPane().setLayout(layout);
    layout.setHorizontalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(layout.createSequentialGroup()
            .addContainerGap()
            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                    .addComponent(jLabel7)
                    .addGap(16, 16, 16)
                    .addComponent(jLabel12)
                    .addGap(18, 18, 18)
                    .addComponent(jLabel11, javax.swing.GroupLayout.PREFERRED_SIZE, 4, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addGap(18, 18, 18)
                    .addComponent(jLabel13)
                    .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                    .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                        .addComponent(jToggleButton1)
                        .addGroup(layout.createSequentialGroup()
                            .addComponent(jLabel2)
                            .addGap(18, 18, 18)
                            .addComponent(jLabel3)))
                    .addGap(92, 92, 92))
                .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                    .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
                        .addGroup(javax.swing.GroupLayout.Alignment.LEADING, layout.createSequentialGroup()
                            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                                .addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 52, javax.swing.GroupLayout.PREFERRED_SIZE)
                                .addGroup(layout.createSequentialGroup()
                                    .addComponent(jLabel4)
                                    .addGap(18, 18, 18)
                                    .addComponent(jLabel5))
                                .addGroup(layout.createSequentialGroup()
                                    .addGap(68, 68, 68)
                                    .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, 70, javax.swing.GroupLayout.PREFERRED_SIZE)))
                            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                                .addGroup(layout.createSequentialGroup()
                                    .addGap(13, 13, 13)
                                    .addComponent(jLabel8, javax.swing.GroupLayout.PREFERRED_SIZE, 40, javax.swing.GroupLayout.PREFERRED_SIZE)
                                    .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                                    .addComponent(jLabel9, javax.swing.GroupLayout.PREFERRED_SIZE, 40, javax.swing.GroupLayout.PREFERRED_SIZE)
                                    .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                                    .addComponent(jLabel10, javax.swing.GroupLayout.PREFERRED_SIZE, 40, javax.swing.GroupLayout.PREFERRED_SIZE))
                                .addGroup(layout.createSequentialGroup()
                                    .addGap(24, 24, 24)
                                    .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                                        .addComponent(jLabel6)
                                        .addComponent(jTextField2, javax.swing.GroupLayout.PREFERRED_SIZE, 71, javax.swing.GroupLayout.PREFERRED_SIZE))))
                            .addGap(0, 0, Short.MAX_VALUE))
                        .addGroup(layout.createSequentialGroup()
                            .addGap(63, 288, Short.MAX_VALUE)
                            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                                .addComponent(jButton2, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                                .addComponent(jButton1, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))))
                    .addGap(23, 23, 23))))
    );
    layout.setVerticalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(layout.createSequentialGroup()
            .addGap(51, 51, 51)
            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                .addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 28, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addComponent(jLabel8, javax.swing.GroupLayout.PREFERRED_SIZE, 28, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addComponent(jLabel9, javax.swing.GroupLayout.PREFERRED_SIZE, 28, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addComponent(jLabel10, javax.swing.GroupLayout.PREFERRED_SIZE, 28, javax.swing.GroupLayout.PREFERRED_SIZE))
            .addGap(40, 40, 40)
            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                .addComponent(jLabel2)
                .addComponent(jLabel3)
                .addComponent(jLabel7)
                .addComponent(jLabel11)
                .addComponent(jLabel12)
                .addComponent(jLabel13))
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
            .addComponent(jToggleButton1)
            .addGap(18, 18, 18)
            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                .addComponent(jLabel4)
                .addComponent(jLabel5)
                .addComponent(jLabel6))
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addComponent(jTextField2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addComponent(jButton1))
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
            .addComponent(jButton2)
            .addContainerGap(22, Short.MAX_VALUE))
    );

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

private void jMenuItem1ActionPerformed(java.awt.event.ActionEvent evt) {                                           
    // Used to change background color
    Color backgroundColor = JColorChooser.showDialog(this, "Choose background color", Color.white);
    getContentPane().setBackground(backgroundColor);
}                                          

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
    // Take entered values for hours and minute and pass them into Alarm label
    String hr = jTextField1.getText();
    int h = Integer.parseInt(hr);
    String outHr = Integer.toString(h);
    //System.out.println(a);
    jLabel12.setText(String.format("%0d", outHr));
    jTextField1.setText("");

    String min = jTextField2.getText();
    int m = Integer.parseInt(min);
    String outMin = Integer.toString(m);
    //System.out.println(a);
    jLabel13.setText(outMin);
    jTextField2.setText("");
}                                        

private void jToggleButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                               
    // Change color of Alamr ON/OFF label when toggle butotn pressed

    if(jToggleButton1.isSelected()){

        jLabel3.setForeground(Color.black);
        jLabel2.setVisible(true);
        jLabel2.setForeground(Color.red);

    }
    else{

        jLabel2.setForeground(Color.black);
        jLabel3.setVisible(true);
        jLabel3.setForeground(Color.red);

    }

}                                              

private void jMenuItem2ActionPerformed(java.awt.event.ActionEvent evt) {                                           
    // Change font of JLabels
    Font font = new Font("Times New Roman", Font.BOLD, 14);
    jLabel1.setFont(font);
    jLabel2.setFont(font);
    jLabel3.setFont(font);
    jLabel4.setFont(font);
    jLabel5.setFont(font);
    jLabel6.setFont(font);
    jLabel7.setFont(font);

}                                          

private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {                                         
    // Blank out Alarm when Reset is pressed
    jLabel12.setText("");
    jLabel13.setText("");
    JOptionPane.showMessageDialog(null, "The alarm has been reset");
}                                        

/**
 * @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(TypeAlarmClock.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (InstantiationException ex) {
        java.util.logging.Logger.getLogger(TypeAlarmClock.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (IllegalAccessException ex) {
        java.util.logging.Logger.getLogger(TypeAlarmClock.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (javax.swing.UnsupportedLookAndFeelException ex) {
        java.util.logging.Logger.getLogger(TypeAlarmClock.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 TypeAlarmClock().setVisible(true);
        }
    });
}

// Variables declaration - do not modify                     
private javax.swing.JButton jButton1;
private javax.swing.JButton jButton2;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel10;
private javax.swing.JLabel jLabel11;
private javax.swing.JLabel jLabel12;
private javax.swing.JLabel jLabel13;
private javax.swing.JLabel jLabel2;
private javax.swing.JLabel jLabel3;
private javax.swing.JLabel jLabel4;
private javax.swing.JLabel jLabel5;
private javax.swing.JLabel jLabel6;
private javax.swing.JLabel jLabel7;
private javax.swing.JLabel jLabel8;
private javax.swing.JLabel jLabel9;
private javax.swing.JMenu jMenu1;
private javax.swing.JMenuBar jMenuBar1;
private javax.swing.JMenuItem jMenuItem1;
private javax.swing.JMenuItem jMenuItem2;
private javax.swing.JPopupMenu.Separator jSeparator1;
private javax.swing.JTextField jTextField1;
private javax.swing.JTextField jTextField2;
private javax.swing.JToggleButton jToggleButton1;
// End of variables declaration                   

包装hw4；
导入java.awt.Color；
导入java.awt.Font；
导入javax.swing.JColorChooser；
导入javax.swing.UIManager；
导入javax.swing.JOptionPane；
公共类TypeAlarmClock扩展了javax.swing.JFrame{
/**
*创建新表单类型AlarmClock
*/
公共类型报警时钟（）{
初始化组件（）；
}
/**
*从构造函数中调用此方法来初始化表单。
*警告：不要修改此代码。此方法的内容始终为
*由表单编辑器重新生成。
*/
@抑制警告（“未选中”）
//                           
私有组件（）{
jLabel1=newjavax.swing.JLabel（）；
jLabel2=newjavax.swing.JLabel（）；
jLabel3=newjavax.swing.JLabel（）；
jLabel4=newjavax.swing.JLabel（）；
jLabel5=newjavax.swing.JLabel（）；
jLabel6=newjavax.swing.JLabel（）；
jTextField1=newjavax.swing.JTextField（）；
jTextField2=newjavax.swing.JTextField（）；
jButton1=newjavax.swing.JButton（）；
jLabel7=newjavax.swing.JLabel（）；
jToggleButton1=newjavax.swing.JToggleButton（）；
jLabel8=newjavax.swing.JLabel（）；
jLabel9=newjavax.swing.JLabel（）；
jLabel10=newjavax.swing.JLabel（）；
jLabel11=newjavax.swing.JLabel（）；
jLabel12=newjavax.swing.JLabel（）；
jLabel13=newjavax.swing.JLabel（）；
jButton2=newjavax.swing.JButton（）；
jMenuBar1=newjavax.swing.JMenuBar（）；
jMenu1=newjavax.swing.JMenu（）；
jMenuItem1=newjavax.swing.JMenuItem（）；
jSeparator1=newjavax.swing.jpopumenu.Separator（）；
jMenuItem2=newjavax.swing.JMenuItem（）；
setDefaultCloseOperation（javax.swing.WindowConstants.EXIT_ON_CLOSE）；
设置标题（“类型闹钟”）；
jLabel1.setText（“时钟：”）；
jLabel2.setText（“报警开启”）；
jLabel3.setText（“报警关闭”）；
jLabel4.setText（“设置报警：”）；
jLabel5.setText（“小时”）；
jLabel6.setText（“会议记录”）；
jButton1.setText（“设置报警”）；
jButton1.addActionListener（新java.awt.event.ActionListener（）{
public void actionPerformed（java.awt.event.ActionEvent evt）{
jButton1ActionPerformed（evt）；
}
});
jLabel7.setText（“报警：”）；
jToggleButton1.setText（“报警开/关”）；
jToggleButton1.addActionListener（新java.awt.event.ActionListener（）{
public void actionPerformed（java.awt.event.ActionEvent evt）{
jToggleButton1ActionExecuted（evt）；
}
});
jLabel8.setFont（新的java.awt.Font（“Tahoma”，1，11））；//NOI18N
jLabel8.setHorizontalAlignment（javax.swing.SwingConstants.CENTER）；
jLabel8.setText（“10:”）；
jLabel9.setFont（新的java.awt.Font（“Tahoma”，1，11））；//NOI18N
jLabel9.setHorizontalAlignment（javax.swing.SwingConstants.CENTER）；
jLabel9.setText（“09:”）；
jLabel10.setFont（新的java.awt.Font（“Tahoma”，1，11））；//NOI18N
jLabel10.setHorizontalAlignment（javax.swing.SwingConstants.CENTER）；
jLabel10.setText（“00”）；
jLabel11.setText（“：”）；
jButton2.setText（“重置”）；
jButton2.addActionListener（新java.awt.event.ActionListener（）{
public void actionPerformed（java.awt.event.ActionEvent evt）{
jButton2ActionPerformed（evt）；
}
});
jMenu1.setText（“期权”）；
jMenuItem1.setText（“更改背景色”）；
jMenuItem1.addActionListener（新java.awt.event.ActionListener（）{
public void actionPerformed（java.awt.event.ActionEvent evt）{
jMenuItem1执行的操作（evt）；
}
});
jMenu1.add（jMenuItem1）；
jMenu1.add（jSeparator1）；
jMenuItem2.setText（“更改字体”）；
jMenuItem2.addActionListener（新java.awt.event.ActionListener（）{
public void actionPerformed（java.awt.event.ActionEvent evt）{
jMenuItem2ActionPerformed（evt）；
}
});
jMenu1.add（jMenuItem2）；
jMenuBar1.add（jMenu1）；
setJMenuBar（jMenuBar1）；
javax.swing.GroupLayout=newjavax.swing.GroupLayout（getContentPane（））；
getContentPane（）.setLayout（布局）；
layout.setHorizontalGroup(
createParallelGroup（javax.swing.GroupLayout.Alignment.LEADING）
.addGroup（layout.createSequentialGroup（）
.addContainerGap（）
.addGroup（layout.createParallelGroup（javax.swing.GroupLayout.Alignment.LEADING）
.addGroup（javax.swing.GroupLayout.Alignment.TRAILING，layout.createSequentialGroup（）
.addComponent（jLabel7）
.addGap（16,16,16）
.addComponent（jLabel12）
.addGap（18,18,18）
.addComponent（jLabel11，javax.swing.GroupLayout.PREFERRED\u SIZE，4，javax.swing.GroupLayout.PREFERRED\u SIZE）
.addGap（18,18,18）
.addComponent（jLabel13）
.addPreferredGap（javax.swing.LayoutStyle.ComponentPlacement.RELATED，javax.swing.GroupLayout.DEFAULT\u SIZE，Short.MAX\u值）
.addGroup（layout.createParallelGroup（javax.swing.GroupLayout.Alignment.LEADING）
.addComponent（jToggleButton1）
.addGroup（layout.createSequentialGroup（）
.addComponent（jLabel2）
.addGap（18,18,18）
.addComponent（jLabel3）））
.addGap（92,92,92））
.addGroup（javax.swing.GroupLayout.Alignment.TRAILING，layout.createSequentialGroup（）
.addGroup（layout.createParallelGroup（javax.swing.GroupLayout.Alignment.training）
.addGroup（javax.swing.GroupLayout.Alignment.LEADING，layout.createSequentialGroup（）
.addGroup（layout.createParallelGroup（javax.swing.GroupLayout.Alignment.LEADING）