我是Java的初学者。我的程序处理当前帧并在单击按钮时调用新帧。问题是，如果我连续不停地使用这个程序，CPU使用率会持续增加，直到它最终滞后并使用高达99％的CPU！我不知道为什么会这样。请帮忙！
编辑：我发现了问题，它用这个线程让我的时钟更新！我已经尝试在处理表单时停止该线程，但这似乎不起作用。知道我应该做什么吗？
private volatile boolean isRunning = true;
new Thread()
{
public void run()
{
while (isRunning)
{
Calendar cal = new GregorianCalendar();
hour = cal.get(Calendar.HOUR);
minutes = cal.get(Calendar.MINUTE);
seconds = cal.get(Calendar.SECOND);
am_pm = cal.get(Calendar.AM_PM);
day = cal.get(Calendar.DAY_OF_WEEK);
dayofmonth = cal.get(Calendar.DAY_OF_MONTH);
month = cal.get(Calendar.MONTH) + 1;
year = cal.get(Calendar.YEAR);
if(am_pm == 1)
{
hour = hour + 12;
}
else
{
if(hour == 12)
{
hour = hour - 12;
}
else
{
hour = hour;
}
}
String time = hour + ":" + minutes + ":" + seconds;
String date = dayofmonth + "/" + month + "/" + year;
Clock.setText(time);
Date.setText(date);
}
public void kill(){
isRunning = false;
}
kill();
this.dispose();
new PaymentForm().setVisible(true);
这是整个RegistrationForm的代码。
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package car.parking.auto.pay.station;
import com.sun.glass.events.KeyEvent;
import java.awt.Component;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.PrintWriter;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import java.util.Calendar;
import java.util.GregorianCalendar;
import java.util.Scanner;
/**
*
* @author superbad95
*/
public class RegistrationForm extends javax.swing.JFrame {
private volatile boolean isRunning = true; //A condition for the while loop to continue for refreshing the clock.
int hour; //Hour variable to store the hour of the current system time.
int minutes; //Minutes variable to store the minutes of the current system time.
int seconds; //Seconds variable to store the seconds of the current system time.
int am_pm; //AM_PM variable to store the AM/PM.
int day; //Day variable to store the current day of the week.
int dayofmonth; //Variable to store the day of the month.
int month; //Variable to store the month.
int year; //Variable to store the year.
public static String Carplate; //A global variable to store the text from CarplateTxt.
String Temp;
JFrame frame = new JFrame();
public RegistrationForm() {
initComponents();
Error.setText("");
new Thread()
{
public void run()
{
while (isRunning)
{
Calendar cal = new GregorianCalendar();
hour = cal.get(Calendar.HOUR);
minutes = cal.get(Calendar.MINUTE);
seconds = cal.get(Calendar.SECOND);
am_pm = cal.get(Calendar.AM_PM);
day = cal.get(Calendar.DAY_OF_WEEK);
dayofmonth = cal.get(Calendar.DAY_OF_MONTH);
month = cal.get(Calendar.MONTH) + 1;
year = cal.get(Calendar.YEAR);
if(am_pm == 1)
{
hour = hour + 12;
}
else
{
if(hour == 12)
{
hour = hour - 12;
}
else
{
hour = hour;
}
}
String time = hour + ":" + minutes + ":" + seconds;
String date = dayofmonth + "/" + month + "/" + year;
Clock.setText(time);
Date.setText(date);
}
}
}.start();
}
/**
* 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() {
Clock = new javax.swing.JLabel();
CarplateTxt = new javax.swing.JTextField();
CheckOutBtn = new javax.swing.JButton();
CheckInBtn = new javax.swing.JButton();
Date = new javax.swing.JLabel();
Error = new javax.swing.JLabel();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
setResizable(false);
Clock.setFont(new java.awt.Font("Roboto Thin", 0, 36)); // NOI18N
Clock.setText("18:32:12");
CarplateTxt.setFont(new java.awt.Font("Roboto Thin", 0, 36)); // NOI18N
CarplateTxt.addFocusListener(new java.awt.event.FocusAdapter() {
public void focusLost(java.awt.event.FocusEvent evt) {
CarplateTxtFocusLost(evt);
}
});
CarplateTxt.addKeyListener(new java.awt.event.KeyAdapter() {
public void keyTyped(java.awt.event.KeyEvent evt) {
CarplateTxtKeyTyped(evt);
}
});
CheckOutBtn.setFont(new java.awt.Font("Roboto Light", 0, 24)); // NOI18N
CheckOutBtn.setText("Check-Out");
CheckOutBtn.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
CheckOutBtnActionPerformed(evt);
}
});
CheckInBtn.setFont(new java.awt.Font("Roboto Light", 0, 24)); // NOI18N
CheckInBtn.setText("Check-In");
CheckInBtn.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
CheckInBtnActionPerformed(evt);
}
});
Date.setFont(new java.awt.Font("Roboto Thin", 0, 18)); // NOI18N
Date.setText("24/2/2015");
Error.setFont(new java.awt.Font("Roboto Light", 0, 11)); // NOI18N
Error.setForeground(java.awt.Color.red);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(70, 70, 70)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.CENTER)
.addComponent(CheckOutBtn)
.addComponent(CheckInBtn)
.addComponent(Clock)
.addComponent(CarplateTxt, javax.swing.GroupLayout.PREFERRED_SIZE, 240, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(Date)
.addComponent(Error))
.addContainerGap(70, Short.MAX_VALUE))
);
layout.linkSize(javax.swing.SwingConstants.HORIZONTAL, new java.awt.Component[] {CheckInBtn, CheckOutBtn});
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addContainerGap(132, Short.MAX_VALUE)
.addComponent(Date)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(Clock)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(CarplateTxt, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(18, 18, 18)
.addComponent(Error)
.addGap(5, 5, 5)
.addComponent(CheckInBtn)
.addGap(18, 18, 18)
.addComponent(CheckOutBtn)
.addGap(20, 20, 20))
);
layout.linkSize(javax.swing.SwingConstants.VERTICAL, new java.awt.Component[] {CarplateTxt, Clock});
layout.linkSize(javax.swing.SwingConstants.VERTICAL, new java.awt.Component[] {CheckInBtn, CheckOutBtn});
pack();
}// </editor-fold>
private void CheckInBtnActionPerformed(java.awt.event.ActionEvent evt) {
Carplate = CarplateTxt.getText().toUpperCase();
if (Carplate.length() < 2)
{
Error.setText("Please enter a valid Carplate number.");
CarplateTxt.requestFocus();
}
else
{
Error.setText("");
File temp = new File ("");
Temp = temp.getAbsolutePath();
File file = new File (Temp+"//Files//Details//"+Carplate+".txt");
if(file.exists())
{
try{
Scanner input = new Scanner(file);
Car_Information.Carplate = input.nextLine();
Car_Information.CheckInDate = input.nextLine();
Car_Information.CheckInTime = input.nextLine();
Car_Information.CheckInHour = input.nextInt();
Car_Information.CheckInMinute = input.nextInt();
Car_Information.CheckInMinuteTime = input.nextInt();
Car_Information.CheckInDay = input.nextInt();
Car_Information.CheckInDayofthemonth = input.nextInt();
Car_Information.CheckInMonth = input.nextInt();
Car_Information.CheckInYear = input.nextInt();
}catch(IOException ex)
{System.out.printf("ERROR: %s\n", ex);}
JOptionPane.showMessageDialog(frame, Car_Information.Carplate + " has already been registered at " +Car_Information.CheckInTime+ " On " +Car_Information.CheckInDate + ". Please Check-out the vehicle.");
}
else
{
Car_Information.Carplate = Carplate;
Car_Information.CheckInHour = hour;
Car_Information.CheckInMinute = minutes;
Car_Information.CheckInDay = day;
Car_Information.CheckInDayofthemonth = dayofmonth;
Car_Information.CheckInMonth = month;
Car_Information.CheckInYear = year;
Car_Information.CheckInTimeChange(Car_Information.CheckInHour, Car_Information.CheckInMinute);
Car_Information.CheckInMinuteTimeConversion(Car_Information.CheckInHour,Car_Information.CheckInMinute);
Car_Information.CheckInDateConversion(Car_Information.CheckInDayofthemonth, Car_Information.CheckInMonth, Car_Information.CheckInYear);
try{
PrintWriter output = new PrintWriter(file);
output.println(Car_Information.Carplate);
output.println(Car_Information.CheckInDate);
output.println(Car_Information.CheckInTime);
output.println(Car_Information.CheckInHour);
output.println(Car_Information.CheckInMinute);
output.println(Car_Information.CheckInMinuteTime);
output.println(Car_Information.CheckInDay);
output.println(Car_Information.CheckInDayofthemonth);
output.println(Car_Information.CheckInMonth);
output.println(Car_Information.CheckInYear);
output.close();
}catch(IOException ex)
{System.out.printf("ERROR: %s\n", ex);}
JOptionPane.showMessageDialog(frame, Car_Information.Carplate + " has been registered at " + Car_Information.CheckInTime);}
}
}
private void CarplateTxtKeyTyped(java.awt.event.KeyEvent evt) {
Carplate = CarplateTxt.getText().toUpperCase();
char verif = evt.getKeyChar();
if(!(Character.isDigit(verif) || Character.isAlphabetic(verif) || (verif == KeyEvent.VK_BACKSPACE)))
{
Error.setText("Please enter a valid Carplate number.");
getToolkit().beep();
evt.consume();
}
else
{
Error.setText("");
}
if (Carplate.length() > 6)
{
Error.setText("Please enter a valid Carplate number.");
getToolkit().beep();
evt.consume();
}
else
{
Error.setText("");
}
}
private void CarplateTxtFocusLost(java.awt.event.FocusEvent evt) {
if (CarplateTxt.getText().length() < 2)
{
getToolkit().beep();
}
}
private void CheckOutBtnActionPerformed(java.awt.event.ActionEvent evt) {
Carplate = CarplateTxt.getText().toUpperCase();
if (Carplate.length() < 2)
{
Error.setText("Please enter a valid Carplate number.");
CarplateTxt.requestFocus();
}
else{
File temp = new File ("");
Temp = temp.getAbsolutePath();
File file = new File (Temp+"//Files//Details//"+Carplate+".txt");
if(file.exists())
{
Car_Information.CheckOutDayofthemonth = dayofmonth;
Car_Information.CheckOutMonth = month;
Car_Information.CheckOutYear = year;
Car_Information.CheckOutHour = hour;
Car_Information.CheckOutMinute = minutes;
Car_Information.CheckOutDateConversion(Car_Information.CheckOutDayofthemonth, Car_Information.CheckOutMonth,Car_Information.CheckOutYear);
Car_Information.CheckOutMinuteTimeConversion(Car_Information.CheckOutHour,Car_Information.CheckOutMinute);
Car_Information.CheckOutTimeChange(Car_Information.CheckOutHour,Car_Information.CheckOutMinute);
try{
Scanner input = new Scanner(file);
Car_Information.Carplate = input.nextLine();
Car_Information.CheckInDate = input.nextLine();
}catch(FileNotFoundException ex)
{System.out.printf("ERROR: %s\n", ex);}
if(!Car_Information.CheckInDate.equals(Car_Information.CheckOutDate))
{
JOptionPane.showMessageDialog(frame, "Your car was registered on " + Car_Information.CheckInDate + ", please contact authorities for further instructions.");
}
else
{
kill();
this.dispose();
new PaymentForm().setVisible(true);
}
}
else
{
JOptionPane.showMessageDialog(frame,"This vehicle is not registered.");
}
}
}
public void kill(){
isRunning = false;
}
public static void main(String args[]) {
//<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(RegistrationForm.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(RegistrationForm.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(RegistrationForm.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(RegistrationForm.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 RegistrationForm().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JTextField CarplateTxt;
private javax.swing.JButton CheckInBtn;
private javax.swing.JButton CheckOutBtn;
private javax.swing.JLabel Clock;
private javax.swing.JLabel Date;
private javax.swing.JLabel Error;
// End of variables declaration
}