publicclassMethodExecutionTime{publicstaticvoidmain(String[]args){longstartTime=System.currentTimeMillis();// 调用需要计算执行时间的方法calculateExecutionTime();longendTime=System.currentTimeMillis();longexecutionTime=endTime-startTime;System.out.println("方法执行时间(毫秒):"+executionTime);}publicstaticv...
2.1 创建自定义注解 public@interfaceExecutionTime{} 1. 2. 2.2 创建切面类 @Aspect@ComponentpublicclassExecutionTimeAspect{@Around("@annotation(ExecutionTime)")publicObjectcalculateExecutionTime(ProceedingJoinPointjoinPoint)throwsThrowable{longstartTime=System.currentTimeMillis();Objectresult=joinPoint.proceed();...
By knowing the difference between start and end time, we can calculate the program execution time. Stopwatchstopwatch=newStopwatch();stopwatch.start();// ...stopwatch.stop();longmillis=stopwatch.getElapsedTime();longnanos=stopwatch.getElapsedTime(TimeUnit.NANOSECONDS); To implement the custom ...
ExecutionTime3.java package com.mkyong.time; import java.time.Instant; import java.util.concurrent.TimeUnit; public class ExecutionTime3 { public static void main(String[] args) throws InterruptedException { long lStartTime = Instant.now().toEpochMilli(); calculation(); long lEndTime = Instant...
Example: Calculate Difference Between Two Time Periods public class Time { int seconds; int minutes; int hours; public Time(int hours, int minutes, int seconds) { this.hours = hours; this.minutes = minutes; this.seconds = seconds; } public static void main(String[] args) { // create ...
Learn to calculate execution time or measure elapsed time of program using System.nanoTime() and currentTimeMillis() and Java 8 Duration.
方法publicstaticvoiddelay(){try{Thread.sleep(1000L);}catch(InterruptedExceptione){thrownewRuntimeException(e);}}privatedoublecalculatePrice(Stringproduct){delay();//模拟计算延迟returnnewRandom().nextDouble()*product.charAt(0)*product.charAt(1);}publicdoublegetPrice(Stringproduct){returncalculatePrice(...
1、操作系统有两个容易混淆的概念,进程和线程。 进程:一个计算机程序的运行实例,包含了需要执行的指令;有自己的独立地址空间,包含程序内容和数据;不同进程的地址空间是互相隔离的;进程拥有各种资源和状态信息,包括打开的文件、子进程和信号处理。 线程:表示程序的执行流程,是CPU调度执行的基本单位;线程有自己的程序计...
Unchecked Exception ：运行时异常，是RuntimeException类及其子类，如：NullPointerException(空指针异常)、...
CREATE_DETACHED);// stack sizeif(os::Linux::supports_variable_stack_size()){// calculate ...