您好我过去几天一直在努力，似乎无法解决问题我想在Jframe中制作一个可以重置并重新启动的计时器。我似乎得到错误，计时器已被取消，但不能如何解决这个，任何帮助将不胜感激。 这是我的代码
package cubebuddy;
import java.util.Timer;
import java.util.TimerTask;
public class One_timer extends javax.swing.JFrame {
Timer timer= new Timer();
String ms, s, m;
public One_timer() {
initComponents();
}
TimerTask myTimerTask = new TimerTask() {
@Override
public void run() {
ms = Timer_display_ms.getText();
s = Timer_display_s.getText();
m = Timer_display_m.getText();
Long MS_timer = Long.valueOf(ms);
Long S_timer = Long.valueOf(s);
Long M_timer = Long.valueOf(m);
if (ms.equals(Long.toString(99))) {
s = Long.toString(++S_timer);
Timer_display_s.setText(s);
}
if ("99".equals(Timer_display_ms.getText())) {
Timer_display_ms.setText("0");
} else {
ms = Long.toString(++MS_timer);
Timer_display_ms.setText(ms);
}
if (s.equals(Long.toString(60))) {
m = Long.toString(++M_timer);
Timer_display_m.setText(m);
Timer_display_s.setText("0");
}
}
};
/**
* 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() {
OT_start_button = new javax.swing.JButton();
Timer_display_ms = new javax.swing.JTextField();
OT_stop_button = new javax.swing.JButton();
Timer_display_s = new javax.swing.JTextField();
Timer_display_m = new javax.swing.JTextField();
OT_Reset_button = new javax.swing.JButton();
jLabel1 = new javax.swing.JLabel();
jLabel2 = new javax.swing.JLabel();
jLabel3 = new javax.swing.JLabel();
setBackground(new java.awt.Color(0, 153, 204));
setCursor(new java.awt.Cursor(java.awt.Cursor.DEFAULT_CURSOR));
addWindowListener(new java.awt.event.WindowAdapter() {
public void windowActivated(java.awt.event.WindowEvent evt) {
formWindowActivated(evt);
}
});
OT_start_button.setText("Start");
OT_start_button.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
OT_start_buttonActionPerformed(evt);
}
});
Timer_display_ms.setEditable(false);
Timer_display_ms.setBackground(new java.awt.Color(102, 102, 102));
Timer_display_ms.setFont(new java.awt.Font("sansserif", 0, 48)); // NOI18N
Timer_display_ms.setHorizontalAlignment(javax.swing.JTextField.CENTER);
Timer_display_ms.setText("0");
Timer_display_ms.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
Timer_display_msActionPerformed(evt);
}
});
OT_stop_button.setText("Stop");
OT_stop_button.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
OT_stop_buttonActionPerformed(evt);
}
});
Timer_display_s.setEditable(false);
Timer_display_s.setBackground(new java.awt.Color(102, 102, 102));
Timer_display_s.setFont(new java.awt.Font("sansserif", 0, 48)); // NOI18N
Timer_display_s.setHorizontalAlignment(javax.swing.JTextField.CENTER);
Timer_display_s.setText("0");
Timer_display_m.setEditable(false);
Timer_display_m.setBackground(new java.awt.Color(102, 102, 102));
Timer_display_m.setFont(new java.awt.Font("sansserif", 0, 48)); // NOI18N
Timer_display_m.setHorizontalAlignment(javax.swing.JTextField.CENTER);
Timer_display_m.setText("0");
OT_Reset_button.setText("Reset");
OT_Reset_button.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
OT_Reset_buttonActionPerformed(evt);
}
});
jLabel1.setBackground(new java.awt.Color(0, 0, 0));
jLabel1.setHorizontalAlignment(javax.swing.SwingConstants.CENTER);
jLabel1.setText("Min");
jLabel2.setBackground(new java.awt.Color(0, 0, 0));
jLabel2.setHorizontalAlignment(javax.swing.SwingConstants.CENTER);
jLabel2.setText("sec");
jLabel3.setBackground(new java.awt.Color(0, 0, 0));
jLabel3.setHorizontalAlignment(javax.swing.SwingConstants.CENTER);
jLabel3.setText("Mil sec");
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(layout.createSequentialGroup()
.addComponent(Timer_display_m, javax.swing.GroupLayout.PREFERRED_SIZE, 260, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(46, 46, 46)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(6, 6, 6)
.addComponent(jLabel2, javax.swing.GroupLayout.PREFERRED_SIZE, 294, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addComponent(Timer_display_s, javax.swing.GroupLayout.PREFERRED_SIZE, 265, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(35, 35, 35)))
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(5, 5, 5)
.addComponent(jLabel3, javax.swing.GroupLayout.PREFERRED_SIZE, 294, javax.swing.GroupLayout.PREFERRED_SIZE))
.addComponent(Timer_display_ms, javax.swing.GroupLayout.PREFERRED_SIZE, 263, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
.addComponent(OT_stop_button, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(OT_Reset_button, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, 265, Short.MAX_VALUE)
.addComponent(OT_start_button, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))))
.addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 294, javax.swing.GroupLayout.PREFERRED_SIZE))
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(19, 19, 19)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 16, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel2, javax.swing.GroupLayout.PREFERRED_SIZE, 16, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel3, javax.swing.GroupLayout.PREFERRED_SIZE, 16, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(Timer_display_s)
.addComponent(Timer_display_ms, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(Timer_display_m, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(18, 18, 18)
.addComponent(OT_start_button, javax.swing.GroupLayout.PREFERRED_SIZE, 62, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(18, 18, 18)
.addComponent(OT_stop_button, javax.swing.GroupLayout.PREFERRED_SIZE, 54, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(18, 18, 18)
.addComponent(OT_Reset_button, javax.swing.GroupLayout.PREFERRED_SIZE, 52, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(26, 26, 26))
);
pack();
}// </editor-fold>
private void OT_start_buttonActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
timer.schedule(myTimerTask, 0,1);
}
private void OT_stop_buttonActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
timer.cancel();
}
private void OT_Reset_buttonActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
m = "0";
s = "0";
ms = "0";
Timer_display_ms.setText(ms);
Timer_display_s.setText(s);
Timer_display_m.setText(m);
}
private void Timer_display_msActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
}
private void formWindowActivated(java.awt.event.WindowEvent 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(One_timer.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(One_timer.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(One_timer.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(One_timer.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 One_timer().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton OT_Reset_button;
private javax.swing.JButton OT_start_button;
private javax.swing.JButton OT_stop_button;
private javax.swing.JTextField Timer_display_m;
private javax.swing.JTextField Timer_display_ms;
private javax.swing.JTextField Timer_display_s;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JLabel jLabel3;
// End of variables declaration
}
答案 0 :(得分：0)
不是最优雅的解决方案，但您可以将计时器任务转换为嵌套类，并在每次启动监视时创建新的计时器和任务。我认为ScheduledExecutorService通常比计时器更容易使用，因此您可以查看它。
private void OT_start_buttonActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
timer = new Timer();
MyTimerTask task = new MyTimerTask();
timer.schedule(task, 0, 1);
}
private class MyTimerTask extends TimerTask {
@Override
public void run() {
ms = Timer_display_ms.getText();
s = Timer_display_s.getText();
m = Timer_display_m.getText();
Long MS_timer = Long.valueOf(ms);
Long S_timer = Long.valueOf(s);
Long M_timer = Long.valueOf(m);
if (ms.equals(Long.toString(99))) {
s = Long.toString(++S_timer);
Timer_display_s.setText(s);
}
if ("99".equals(Timer_display_ms.getText())) {
Timer_display_ms.setText("0");
} else {
ms = Long.toString(++MS_timer);
Timer_display_ms.setText(ms);
}
if (s.equals(Long.toString(60))) {
m = Long.toString(++M_timer);
Timer_display_m.setText(m);
Timer_display_s.setText("0");
}
}
};