我想创建一个简单的计时器与启动停止和重置按钮。我是使用线程和ActionListeners的新手。我有这个工作,并可以让我的计时器开始,我的按钮来改变从开始到停止的文本。但之后,我卡住了。我需要停止计时器,然后再次启动它,如果我按下启动按钮。然后当然重置将它变回零。我不想使用java.util.Timer
,我只是想使用线程。我将如何获得我的线程一旦开始,暂停然后恢复。我尝试使用内置的方法,但我无法让它编译正确。启动和停止线程JButton对齐
import javax.swing.*;
import java.awt.Font;
import java.lang.String;
import java.awt.*;
public class Timer extends JPanel {
// Here are the fields from below!
private static JLabel label = new JLabel(" 0.00 seconds");
private static javax.swing.JButton start = new javax.swing.JButton("Start");
private static javax.swing.JButton reset = new javax.swing.JButton("reset");
/**
* Here is the Timer method- Begins with JLabel with medium alignment.
*/
public Timer() {
//new Thread(this).start();
//label = new JLabel(" 0.00 Seconds");
//this.label = label;
reset();
}
/**
* Here is the Reset method- pressing this button from below will
* stop the thread and reset the text.
*/
public static void reset() {
label.setFont(new Font("Arial",Font.BOLD,36));
label.setText(" 0.00 Seconds");
}
public static void startStop() {
//start.setText("stop");
//validate();
}
public static void countDown() {
int Msec=0,min=0,sec=0;
while(sec < 60) {
label.setText(min+":"+sec+":"+Msec);
//label.setLayout(new BorderLayout.CENTER);
//label.
Msec++;
if(Msec==60) {
Msec=0;
sec++;
//label.setText(min+":"+sec+":"+Msec);
}
if(sec ==60) {
Msec =0;
sec = 0;
min++;
}
try
{
Thread.sleep(10);
}
catch(Exception e)
{}
}
}
public static void main(String [] args) {
// we need a JFrame to put these elements into
javax.swing.JFrame win = new javax.swing.JFrame("Timer");
// here we are instantating a new timer
final Timer time = new Timer();
//Annonymous inner class
start.addActionListener(new java.awt.event.ActionListener() {
// here is the action performed method to start this.
public void actionPerformed(java.awt.event.ActionEvent e) {
//here we are creating a new thread to run throwable
// every click creates a new Thread (so it goes faster)
String text = (String)e.getActionCommand();
if (text.equals("Start")){
start.setText("Stop");
}
else{
start.setText("Start");
}
Thread restart = new Thread(new Runnable() {
public void run() {
countDown();
//startStop();
}
});
restart.start();
}
});
//Look at the below abstract actionlistener below to get reset to work
javax.swing.JButton reset = new javax.swing.JButton("reset");
// here we are creating a new annonomys inner class.... check the
// curly braces
reset.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent e) {
Thread restart = new Thread(new Runnable() {
public void run() {
reset();
//Thread.stop();
}
});
restart.destroy();
}
});
//label.setVisible(true);
javax.swing.JPanel tb = new javax.swing.JPanel();
tb.add(reset);
tb.add(start);
//tb.add(circle);
win.add(tb,java.awt.BorderLayout.NORTH);
win.setSize(300,300);
//win.add(tb);
win.add(label,java.awt.BorderLayout.CENTER);
win.setDefaultCloseOperation(javax.swing.JFrame.DISPOSE_ON_CLOSE);
// hiding inside setVisible is borderLayout
win.setVisible(true);
}
}
*“我新使用.. ActiveListeners ..”*那是什么?大耳朵和关注度好的人? – 2012-04-25 20:54:53
“lol”actionListeners .... – 2012-04-25 21:21:48
如果你还没有这样做,你应该阅读[Threads and Swing](http://java.sun.com/products/jfc/tsc/articles/threads/threads1。 html)和[并发在Swing](http://docs.oracle.com/javase/tutorial/uiswing/concurrency/index.html)中有关多线程和Swing的很好介绍。 – 2012-04-25 22:40:52