[英]Scheduling an Applet start with ScheduledExecutorService
我有一個簡單的時鍾小程序,我希望能夠通過 ScheduledExecutorService 進行控制,但是我有點不確定如何使用 ScheduledExecutorService.schedule 命令啟動線程。
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
public class UpdateApplet extends java.applet.Applet implements Runnable
{
ScheduledExecutorService scheduler = Executors.newScheduledThreadPool(1);
Thread thread;
boolean running;
int updateInterval = 1000;
final Runnable clock = new Runnable(){//Can't take credit for this, thnx KH
public void run(){
while(true)
repaint();
}
};
public void run( ){
scheduler.schedule(clock, 10, TimeUnit.SECONDS);//edited this here
}
public void start( ){
System.out.println("starting...");
if ( !running) //naive approach
{
running = true;
thread = new Thread(this);
thread.start( );
}
}
public void stop( ){
System.out.println("stopping...");
thread.interrupt( );
running = false;
}
}
public class Clock extends UpdateApplet{
public void paint(java.awt.Graphics g){
g.drawString(new java.util.Date( ).toString( ), 10, 25);
}
}
我確信它是一個簡單的修復,但我只是沒有看到它。 任何幫助將不勝感激。
您需要使用scheduleAtFixedRate 。 同樣,您不需要在 run 方法中使用線程,
class UpdateApplet() implements Runnable {
ScheduledExecutorService scheduler = Executors.newScheduledThreadPool(1);
volatile boolean running;
int updateInterval = 1000;
public void start() {
scheduler.schedule(this, updateInterval, updateInterval, TimeUnit.MILLISECONDS);
}
public void run() {
if(!running) {
scheduler.shutdown();
}
else {
repaint();
}
}
}
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