StopWatch

public static void main(String[] args) {
  Long startTime = System.currentTimeMillis();
  //  Your business code 
  Long endTime = System.currentTimeMillis();
  Long elapsedTime = (endTime - startTime) / 1000;
  System.out.println(" The total time of this segment ：" + elapsedTime + "s");
}

public static void main(String[] args) throws InterruptedException {
    StopWatch stopWatch = new StopWatch();

    //  Task the first mock exam 3 Second 
    stopWatch.start("TaskOneName");
    Thread.sleep(1000 * 3);
    System.out.println(" Current task name ：" + stopWatch.currentTaskName());
    stopWatch.stop();

    //  Task the first mock exam 10 Second 
    stopWatch.start("TaskTwoName");
    Thread.sleep(1000 * 10);
    System.out.println(" Current task name ：" + stopWatch.currentTaskName());
    stopWatch.stop();

    //  Task the first mock exam 10 Second 
    stopWatch.start("TaskThreeName");
    Thread.sleep(1000 * 10);
    System.out.println(" Current task name ：" + stopWatch.currentTaskName());
    stopWatch.stop();

    //  Printing time 
    System.out.println(stopWatch.prettyPrint());
    System.out.println(stopWatch.shortSummary());
    // stop After that, its value is null
    System.out.println(stopWatch.currentTaskName()); 
    
    //  Information about the last task 
    System.out.println(stopWatch.getLastTaskName());
    System.out.println(stopWatch.getLastTaskInfo());
    
    //  The total time of the task    If you want to get the details of each task （ Including its task name 、 Time consuming, etc ） You can use 
    System.out.println(" All tasks take time ：" + sw.getTotalTimeMillis());
    System.out.println(" Total tasks ：" + sw.getTaskCount());
    System.out.println(" All task details ：" + sw.getTaskInfo());
}