按如下要求创建一个定时器要求如下：制定java定时任务在每个整分时刻执行例如：10点52分0秒执行10点53分0秒执行定时任务是：将计算机物理内存使用情况记录到文件memorytxt末尾每次定时任务在memorytxt中写入一行内存使用数据内存使用数据包含三项值例如：总的物理内存17038327808;剩余物理内存6949703680;已使用物理内存10088624128;提示： 取

import java.io.BufferedWriter; import java.io.FileWriter; import java.io.IOException; import java.lang.management.ManagementFactory; import com.sun.management.OperatingSystemMXBean; import java.text.SimpleDateFormat; import java.util.Date; import java.util.Timer; import java.util.TimerTask;

public class MemoryTimerTask { public static void main(String[] args) { TimerTask task = new TimerTask() { @Override public void run() { //获取当前时间 Date date = new Date(); SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); String currentTime = sdf.format(date);

            //获取内存使用情况
            OperatingSystemMXBean osmxb = (OperatingSystemMXBean) ManagementFactory.getOperatingSystemMXBean();
            long totalMemorySize = osmxb.getTotalPhysicalMemorySize();
            long freePhysicalMemorySize = osmxb.getFreePhysicalMemorySize();
            long usedPhysicalMemorySize = totalMemorySize - freePhysicalMemorySize;
            
            //将内存使用情况写入文件
            BufferedWriter writer = null;
            try {
                writer = new BufferedWriter(new FileWriter("memory.txt", true));
                writer.write("时间：" + currentTime + "; ");
                writer.write("总的物理内存:" + totalMemorySize + "; ");
                writer.write("剩余物理内存:" + freePhysicalMemorySize + "; ");
                writer.write("已使用物理内存:" + usedPhysicalMemorySize + "\n");
                writer.flush();
            } catch (IOException e) {
                e.printStackTrace();
            } finally {
                if (writer != null) {
                    try {
                        writer.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            }
        }
    };
    
    Timer timer = new Timer();
    //获取当前时间
    Date date = new Date();
    SimpleDateFormat sdf = new SimpleDateFormat("ss");
    int seconds = Integer.parseInt(sdf.format(date));
    //计算下一个整分时刻
    long delay = (60 - seconds) * 1000;
    //每隔一分钟执行一次
    timer.scheduleAtFixedRate(task, delay, 60 * 1000);
}

}