import java.awt.BorderLayout;import java.awt.Container;import java.awt.Font;import java.awt.GridLayout;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JOptionPane;import javax.swing.JPanel;import javax.swing.JTextField;public class TimerDemo extends JFrame implements ActionListener { private static final long serialVersionUID = 201306211111L; private JTextField screen = new JTextField("0"); private JButton start = new JButton("开始"); private JButton reset = new JButton("重置"); private JPanel panel = new JPanel(); private boolean isRunning; private int time; private int timeBetween; public TimerDemo(int timeBetween) { super("计时器"); this.timeBetween = timeBetween; try { init(); } catch (Exception e) { e.printStackTrace(); } } public TimerDemo() { super("计时器"); this.timeBetween = 100; try { init(); } catch (Exception e) { e.printStackTrace(); } } private void init() { panel.setLayout(new GridLayout()); panel.add(start); panel.add(reset); start.addActionListener(this); reset.addActionListener(this); screen.setFont(new Font("幼圆", Font.BOLD, 60)); screen.setHorizontalAlignment(JTextField.CENTER); screen.setEditable(false); Container c = getContentPane(); c.setLayout(new BorderLayout()); c.add(panel, BorderLayout.SOUTH); c.add(screen, BorderLayout.CENTER); this.setSize(200, 150); this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); this.setResizable(false); this.setLocationRelativeTo(null); this.setVisible(true); } public static void main(String[] args) { new TimerDemo(1);// 设定 1ms/次 // new TimerDemo(); } @Override public void actionPerformed(ActionEvent e) { if (e.getSource() == start) { if (start.getText().equals("开始")) { start.setText("暂停"); isRunning = true; } else if (start.getText().equals("暂停")) { start.setText("开始"); isRunning = false; } } if (e.getSource() == reset) { start.setText("开始"); screen.setText("0"); isRunning = false; time = 0; } new Thread(new TimeZone()).start(); } class TimeZone implements Runnable { @Override public void run() { while (isRunning) { time++; if (time = Integer.MAX_VALUE) { screen.setText("ERROR"); JOptionPane.showMessageDialog(null, "ERROR"); isRunning = false; } screen.setText(String.valueOf(time)); try { Thread.sleep(timeBetween); } catch (Exception e) { e.printStackTrace(); } } } }}
专注于为中小企业提供做网站、成都网站设计服务,电脑端+手机端+微信端的三站合一,更高效的管理,为中小企业临江免费做网站提供优质的服务。我们立足成都，凝聚了一批互联网行业人才，有力地推动了上千多家企业的稳健成长，帮助中小企业通过网站建设实现规模扩充和转变。
下面是改过的代码：
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Exercise6_41 extends JApplet implements ActionListener
{
Thread timeSub;//倒计时器
JButton buttonStart, buttonRetry; // 开始 和 结束按钮
JLabel questionLabel, answerLabel, levelLabel, styleLabel;
JLabel TimeCount;// 问题，答案，等级和类型的标签
JTextField questionField, answerField, levelField, styleField;
public JTextField timeField;// 问题，回答，等级和类型 的输入框
JTextArea outputArea; // 程序记录域
JScrollPane scroller; // 载入记录
int MAX = 20; // 规定了一套试题的题量
int level = 1; // 规定了试题的等级，1到4 分别代表一位数，两位数，三位数，四位数的运算
int style = 3; // 规定了试题的类型，1到5分别代表加法，减法，乘法，求余数，和混合类型
int answer; // 存储用户输入的答案
int rightAnswer; // 存储标准答案
int rightCounter = 0; // 已经正确回答的问题 计数器
int totalCounter = 0; // 总的问题数 计数器
boolean presentQuestionAnswered = false; // 用来标记系统所给出的当前问题是否已被回答，false 代表未回答
public void init()
{
Container container = getContentPane();
container.setLayout(new FlowLayout());
levelLabel = new JLabel("请再此输入做几位数的运算（1-4）：");
container.add(levelLabel);
levelField = new JTextField(5);
levelField.addActionListener(this);
container.add(levelField);
styleLabel = new JLabel("请再此输入试题的类型（1：加法 2：减法 3：乘法 4：MOD 5：混合）：");
container.add(styleLabel);
styleField = new JTextField(5);
styleField.addActionListener(this);
container.add(styleField);
buttonStart = new JButton("开始");
buttonStart.addActionListener(this);
container.add(buttonStart);
questionLabel = new JLabel("请回答下面的问题：");
container.add(questionLabel);
questionField = new JTextField(20);
questionField.setEditable(false);
container.add(questionField);
answerLabel = new JLabel("在此输入您的答案：");
container.add(answerLabel);
answerField = new JTextField(20);
answerField.setText("");
answerField.addActionListener(this);
container.add(answerField);
outputArea = new JTextArea(20, 40);
outputArea.setEditable(false);
scroller = new JScrollPane(outputArea);
container.add(scroller);
buttonRetry = new JButton("再来一次");
buttonRetry.addActionListener(this);
container.add(buttonRetry);
JLabel TimeCount = new JLabel("计时器");
container.add(TimeCount);
timeField = new JTextField(20);
timeField.setEditable(false);
container.add(timeField);
}
public void actionPerformed(ActionEvent actionEvent)
{
if (actionEvent.getSource() == levelField)
{
level = Integer.parseInt(levelField.getText());
if (level 5 || level 1)
{
JOptionPane.showMessageDialog(null,
"您输入了未定义的等级！\n请重新输入！\n如果您坚持系统将会使用默认的等级！", "错误信息！",
JOptionPane.INFORMATION_MESSAGE);
level = 1;
}
else
{
levelField.setEditable(false);
}
}
else if (actionEvent.getSource() == styleField)
{
style = Integer.parseInt(styleField.getText());
if (style 5 || style 1)
{
JOptionPane.showMessageDialog(null,
"您输入了未定义的试题类型！\n请重新输入！如果您坚持系统将会使用默认的等级！", "错误信息！",
JOptionPane.INFORMATION_MESSAGE);
style = 1;
}
else
{
styleField.setEditable(false);
}
}
else if (actionEvent.getSource() == buttonStart)
{
int time=Integer.parseInt(JOptionPane.showInputDialog(null,"输入定时时间！","60").trim());//获得自定义时间
timeSub=new Exercise6_41TimeSub(time,timeField);//创建计时器
timeSub.start();//启动计时器
answerField.setEditable(true);
answerField.setText("");
totalCounter = 0;
rightCounter = 0;
{
createQuestion(style);
}
}
else if (actionEvent.getSource() == answerField)
{
answer = Integer.parseInt(answerField.getText());
judgeAnswer();
presentQuestionAnswered = true;
totalCounter++;
answerField.setText("");
if (totalCounter MAX)
{
createQuestion(style);
}
else
{
questionField.setText("你已经回答完了规定数量的试题！");
answerField.setText("");
questionField.setEditable(false);
answerField.setEditable(false);
caculateResult();
}
}
else if (actionEvent.getSource() == buttonRetry)
{
level = 1;
style = 1;
levelField.setText("");
levelField.setEditable(true);
styleField.setText("");
styleField.setEditable(true);
totalCounter = 0;
rightCounter = 0;// /再次初始化
}
}
public void createQuestion(int style)
{
if (style == 1)
{
long multi = 0;
if (level 0 level = 5)
{
multi = (long) (Math.pow(10, level));
}
int number1 = (int) (Math.random() * multi);
int number2 = (int) (Math.random() * multi);
rightAnswer = number1 + number2;
questionField.setText(number1 + " + " + number2 + " = ? ");
outputArea.append("\nQuestion " + (int) (totalCounter + 1) + " ："
+ number1 + " + " + number2 + " = ? ");
}
else if (style == 2)
{
long multi = 0;
if (level 0 level = 5)
{
multi = (long) (Math.pow(10, level));
}
int number1 = (int) (Math.random() * multi);
int number2 = (int) (Math.random() * multi);
rightAnswer = number1 - number2;
questionField.setText(number1 + " - " + number2 + " = ? ");
outputArea.append("\nQuestion " + (int) (1 + totalCounter) + " ："
+ number1 + "- " + number2 + " = ? ");
}
else if (style == 3)
{
long multi = 0;
if (level 0 level = 5)
{
multi = (long) (Math.pow(10, level));
}
int number1 = (int) (Math.random() * multi);
int number2 = (int) (Math.random() * multi);
rightAnswer = number1 * number2;
questionField.setText(number1 + " X " + number2 + " = ? ");
outputArea.append("\nQuestion " + (int) (totalCounter + 1) + " ："
+ number1 + " X " + number2 + " = ? ");
}
else if (style == 4)
{
long multi = 0;
if (level 0 level 5)
{
multi = (long) (Math.pow(10, level));
}
int number1 = (int) (Math.random() * multi);
int number2 = (int) (Math.random() * multi);
rightAnswer = number1 % number2;
questionField.setText(number1 + " % " + number2 + " = ? ");
outputArea.append("\nQuestion " + (int) (1 + totalCounter) + " ："
+ number1 + " % " + number2 + " = ? ");
}
else if (style == 5)
{
int temp;
temp = (int) (Math.random() * 100) % 4 + 1;
createQuestion(temp);
}
presentQuestionAnswered = false;
}
public void judgeAnswer()
{
if (answer == rightAnswer)
{
rightCounter++;
outputArea.append(" 回答正确! ");
}
else if (answer != rightAnswer)
{
outputArea.append(" 回答错误! ");
answerField.setText("");
answer = -1;
}
outputArea.append("还剩余 " + (MAX - totalCounter - 1) + " 个问题！\n");
}
public void caculateResult()
{
if (totalCounter == 0)
{
outputArea.append("\n您还未做任何题目！");
JOptionPane.showMessageDialog(null, "无法计算你的正确率！", "统计信息！",
JOptionPane.INFORMATION_MESSAGE);
}
else
{
double result = rightCounter / totalCounter * 100;
outputArea.append("\n正确的概率为：" + result + "%\n");
JOptionPane.showMessageDialog(null, "正确的概率为：" + result + "%",
"统计信息！", JOptionPane.INFORMATION_MESSAGE);
}
}
}
/**********************************************************************
计时器线程
import javax.swing.JOptionPane;
import javax.swing.JTextField;
public class Exercise6_41TimeSub extends Thread
{
private int time;
private JTextField showTime;
public Exercise6_41TimeSub(int time,JTextField showTime)
{
this.time=time;
this.showTime=showTime;
}
public void run()
{
while(true)
{
time--;
showTime.setText("剩余时间："+time);
if(time==0)
{
JOptionPane.showMessageDialog(null,"时间到，请你检查你的答题情况！","时间到",JOptionPane.INFORMATION_MESSAGE);
}
try
{
Thread.sleep(1000);
}
catch(Exception e)
{
e.printStackTrace();
}
}
}
}
哎这个太简单了。。。
Timer t = new Timer();
int s = 5;
TimerTask tt = new TimerTask()
{
public void run()
{
if(s 0)
s--;
}
};
t.scheduleAtFixedRate(tt,0,1000);
应该用线程里面的Timer来控制package com.sy.game.test;
import java.util.Timer;
import java.util.TimerTask;
public class TimeTask {
public static void main(String[] args) {
TimeTask tTask=new TimeTask();
tTask.timeVoid();
}
public void timeVoid(){
final Timer timer = new Timer();
TimerTask tt=new TimerTask() {
@Override
public void run() {
System.out.println("到点啦!");
timer.cancel();
}
};
timer.schedule(tt, 3000);
}
}
整合的：
/*
* java倒计时器
* shiyang
* */
package com.sy.game.test;
import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.Timer;
@SuppressWarnings("unused")
public class TimeController extends JFrame implements ActionListener {
private static final long serialVersionUID = 4603262282860990473L;
private static final int DEFAULT_WIDTH = 200;
private static final int DEFAULT_HEIGHT = 100;
private static final int width = Toolkit.getDefaultToolkit()
.getScreenSize().width;
private static final int height = Toolkit.getDefaultToolkit()
.getScreenSize().height;
private Container container;
private JButton btn;
private JTextField jtfTime;
private Timer tmr;
public TimeController() {
initComponents();
Timer tmr = new Timer(1000, this);
this.tmr = tmr;
setVisible(true);
}
private void initComponents() {
this.setTitle("SY秒表");
this.setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
this.setResizable(false);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setLocation((width - DEFAULT_WIDTH) / 2,
(height - DEFAULT_HEIGHT) / 2);
jtfTime = new JTextField("10");
btn = new JButton("开始倒计时");
container = getContentPane();
JPanel panel = new JPanel();
panel.add(btn);
panel.add(jtfTime);
this.add(panel);
btn.addActionListener(this);
}
public void actionPerformed(ActionEvent ae) {
if (ae.getSource() == btn) {
jtfTime.setText("10");
tmr.start();
} else {
int t;
t = Integer.parseInt(jtfTime.getText());
t--;
jtfTime.setText("" + t);
if (t = 0) {
tmr.stop();
}
}
}
public static void main(String[] args) {
TimeController timeController = new TimeController();
}
}
抱歉，之前没看到第二个条件，重新写了下。
在本机上可以正确运行。
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.io.IOException;
import java.util.Timer;
import java.util.TimerTask;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;
public class TimeThreadFrame extends JFrame{
// 定义组件
private JLabel lblTime;
private JTextField txtInput;
private JButton btnEnter;
// 记录所要启动的程序
private Process runningProcess;
// 构造方法
public TimeThreadFrame(){
// 设置窗体的相关属性
super("TimerThread");
this.setSize(300,200);
this.setLayout(null);
this.setLocation(100,50);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// 创建组件
this.lblTime = new JLabel("请输入倒计时时间");
this.lblTime.setBounds(30,20,200,30);
this.txtInput = new JTextField();
this.txtInput.setBounds(30,70,100,30);
this.btnEnter = new JButton("确定");
this.btnEnter.setBounds(150,70,70,30);
this.runningProcess = null;
// 给JTextField注册监听
this.txtInput.addKeyListener(new KeyListener(){
public void keyPressed(KeyEvent ke) {
}
public void keyReleased(KeyEvent ke) {
}
public void keyTyped(KeyEvent ke) {
txtInput_KeyTyped(ke);
}
});
// 给JButton注册监听
this.btnEnter.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent ae){
btnEnter_ActionPerformed(ae);
}
});
// 将各组件添加到窗体上
add(lblTime);
add(txtInput);
add(btnEnter);
// 显示窗体
this.setVisible(true);
}
// 输入时的事件处理，控制用户只能输入数字
public void txtInput_KeyTyped(KeyEvent ke){
if(ke.getKeyChar() '0' || ke.getKeyChar() '9'){
ke.setKeyChar('\0');
}
}
// 点击按钮时的事件处理，核心！
public void btnEnter_ActionPerformed(ActionEvent ae){
// 获得用户输入的倒计时时间
String strTime = this.txtInput.getText();
if(strTime.equals("")){
// 检测用户是否输入
this.lblTime.setText("您尚未输入，请输入！");
}
else{
Integer time = Integer.parseInt(strTime);
// 创建线程
TimeThread tt = new TimeThread(this.lblTime,time);
tt.start();
// 创建Timer
Timer timer = new Timer();
timer.schedule(new TimerTask(){
// 启动其他程序
public void run() {
try {
// 当程序不存在时，会进行创建；存在时直接调用。
runningProcess = Runtime.getRuntime().exec("D:\\Program Files\\Tencent\\QQDoctor\\QQDoctor.exe");
} catch (IOException e) {
e.printStackTrace();
}
}
}, time * 1000);
}
}
// 启动窗体
public static void main(String[] args){
TimeThreadFrame ttf = new TimeThreadFrame();
}
}
// 时间线程类
class TimeThread extends Thread{
private JLabel lblTime;
private int time;
// 构造方法传入，显示事件的JLabel和倒计时的时间。
public TimeThread(JLabel lblTime, int time){
this.lblTime = lblTime;
this.time = time;
}
// run方法
public void run(){
while(time 0){
// 显示所剩时间
this.lblTime.setText("所剩时间：" + time);
// 所剩时间减少
time--;
try {
this.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
