Spring计时器StopWatch的具体使用

public class StopWatch {
    private final String id;
    private boolean keepTaskList = true;
    private final List<StopWatch.TaskInfo> taskList = new LinkedList<>();
    private long startTimeMillis;
    @Nullable
    private String currentTaskName;
    @Nullable
    private StopWatch.TaskInfo lastTaskInfo;
    private int taskCount;
    private long totalTimeMillis;
    ......方法略
    public static final class TaskInfo {
        private final String taskName;
        private final long timeNanos;
    }
}

    public static void main(String[] args) throws InterruptedException {
        StopWatch stopWatch = new StopWatch();
        stopWatch.start("task1");
        System.out.println("当前任务名称："+stopWatch.currentTaskName());
        Thread.sleep(1000);
        stopWatch.stop();
        System.out.println("task1耗时毫秒："+stopWatch.getLastTaskTimeMillis());
        stopWatch.start("task2");
        System.out.println("当前任务名称："+stopWatch.currentTaskName());
        Thread.sleep(2000);
        stopWatch.stop();
        System.out.println("task2耗时毫秒："+stopWatch.getLastTaskTimeMillis());
        System.out.println("总任务数："+stopWatch.getTaskCount());
        System.out.println("总耗时毫秒："+stopWatch.getTotalTimeMillis());
        System.out.println("所有任务简要信息：\n"+stopWatch.shortSummary());
        System.out.println("所有任务详细信息：\n"+stopWatch.prettyPrint());
    }