定时删除文件Java源码

import Java.io.File;
import java.util.Calendar;
import java.util.Date;
import java.util.Timer;
import java.util.TimerTask;
public class FileDeleter extends TimerTask {
    private static final String targetPath1 = "C:\\Program Files\\Tencent\\QQ\\.......\\image";
    private static final String targetPath2 = "C:\\Program Files\\Tencent\\QQ\\...........\\QQPhoto";
    private Timer timer = new Timer();
   
    private Calendar calendar = Calendar.getInstance();
    public static void main(String[] args) {
        FileDeleter fm = new FileDeleter();
        fm.start();
    }
    private static void delFiles(String[] dir) {
        for (int i = 0; i < dir.length; i++) {
            File f = new File(dir[i]);
            File[] files = null;
            if (f.exists()) {
                files = f.listFiles();
                for (int j = 0; j < files.length; j++) {
                    files[j].delete();
                }
            }
        }
    }
    public void start() {
        //每隔5分钟删除一次
        timer.scheduleAtFixedRate(this, new Date(), 1000 * 300);       
    }
    public void run() {       
        delFiles(new String[] { targetPath1, targetPath2 });   
        //下班之前停止任务 ~.~
        if(calendar.get(Calendar.HOUR_OF_DAY) == 17 && calendar.get(Calendar.MINUTE) == 15){
            this.cancel();
        }
    }
}