如何定时执行程序

import java.io.IOException;
import java.util.Date;
import java.util.Timer;
import java.util.TimerTask;
public class UntilTimerTest {

        
    public static void main(String[] args) throws IOException
    {
        Timer timer=new Timer();
        timer.schedule(new TimerTask()
        {
            @Override
            public void run() {
                long now=System.nanoTime();
                System.out.println(new Date(now));    
                
            }            
        }, 1000,1000);
        
        while(true)
        {
            int c=System.in.read();
            if(c==’c’)
                timer.cancel();
        }
    }
}