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("當(dāng)前任務(wù)名稱："+stopWatch.currentTaskName());
? ? ? ? Thread.sleep(1000);
? ? ? ? stopWatch.stop();
? ? ? ? System.out.println("task1耗時(shí)毫秒："+stopWatch.getLastTaskTimeMillis());
? ? ? ? stopWatch.start("task2");
? ? ? ? System.out.println("當(dāng)前任務(wù)名稱："+stopWatch.currentTaskName());
? ? ? ? Thread.sleep(2000);
? ? ? ? stopWatch.stop();
? ? ? ? System.out.println("task2耗時(shí)毫秒："+stopWatch.getLastTaskTimeMillis());
? ? ? ? System.out.println("總?cè)蝿?wù)數(shù)："+stopWatch.getTaskCount());
? ? ? ? System.out.println("總耗時(shí)毫秒："+stopWatch.getTotalTimeMillis());
? ? ? ? System.out.println("所有任務(wù)簡要信息：\n"+stopWatch.shortSummary());
? ? ? ? System.out.println("所有任務(wù)詳細(xì)信息：\n"+stopWatch.prettyPrint());
? ? }