文章介绍了4种方法，简单易懂，通过4个demo来吸引别人。1、在子线程中，使用join()方法指定顺序。使用join()方法“阻塞”当前线程，等待指定线程执行完毕再继续执行。例：在线程thread2中，添加thread1.join()，意思是当当前线程2运行到这行代码时，会进入阻塞状态，直到线程thread1执行完毕，线程thread2才会继续运行executing，即线程thread1和线程thread2的运行顺序是有保证的。publicclassThreadJoinDemo{publicstaticvoidmain(String[]args)throwsInterruptedException{finalThreadthread1=newThread(newRunnable(){@Overridepublicvoidrun(){System.out.println("打开冰盒！");}});finalThreadthread2=newThread(newRunnable(){@Overridepublicvoidrun(){try{thread1.join();}catch(InterruptedExceptione){e.printStackTrace();}System.out.println("拿出一瓶牛奶！");}});finalThreadthread3=newThread(newRunnable(){@Overridepublicvoidrun(){try{thread2.join();}catch(InterruptedExceptione){e.printStackTrace();}System.out.println("关上冰箱！");}});//下面三行代码的顺序可以随意调整，不会影响程序的运行结果，因为我们已经通过"join()方法指定了运行顺序"在子线程thread3.start();thread2.start();thread1.start();}}运行结果：打开冰箱！取出一瓶牛奶！关闭冰箱！2.在主线程中，使用join()方法指定顺序不同的是，子线程是指Thread内部发生的代码，而主线程是指主函数中发生的代码。我们可以使用join()main函数中的方法使主线程阻塞等待，达到按指定顺序执行的目的。publicclassThreadMainJoinDemo{publicstaticvoidmain(String[]args)throwsInterruptedException{finalThreadthread1=newThread(newRunnable(){@Overridepublicvoidrun(){System.out.println("打开冰箱！");}});finalThreadthread2=newThread(newRunnable(){@Overridepublicvoidrun(){System.out.println("拿出一瓶牛奶！");}});finalThreadthread3=newThread(newRunnable(){@Overridepublicvoidrun(){System.out.println("关掉冰箱！");}});thread1.start();thread1.join();thread2.start();线程2.join();thread3.start();}}我不会介绍基础知识。我写了很多多线程的博客教程。推荐大家看这里：https://www.javastack.cn/cate..输出结果：打开冰箱！拿出一瓶牛奶！关冰箱！3.通过倒计时定时器实现CountDownLatchCountDownLatch通过计数器提供更灵活的控制，只要检测到计数器为0，当前线程就可以往下执行OK不管对应的线程是否执行公共类ThreadCountDownLatchDemo{privatestaticCountDownLatchcountDownLatch1=newCountDownLatch(1);私人静态CountDownLatchcountDownLatch2=newCountDownLatch(1);publicstaticvoidmain(String[]args){finalThreadthread1=newThread(newRunnable(){@Overridepublicvoidrun(){System.out.println("打开冰盒！");countDownLatch1.countDown();}});finalThreadthread2=newThread(newRunnable(){@Overridepublicvoidrun(){try{countDownLatch1.await();System.out.println("拿出一瓶牛奶！");countDownLatch2.countDown();}catch(InterruptedExceptione){e.printStackTrace();}}});finalThreadthread3=newThread(newRunnable(){@Overridepublicvoidrun(){try{countDownLatch2.await();System.out.println("关掉冰箱！");}catch(InterruptedExceptione){e.printStackTrace();}}});//下面三行代码的顺序可以随意调整，不会影响程序的运行结果thread3.start();thread1.start();thread2.start();}}输出结果：打开冰箱！拿出一瓶牛奶！关冰箱！4.通过创建单线程池newSingleThreadExecutor()实现单线程线程池(newSingleThreadExecutor)的优势，串行执行所有任务公共类ThreadPoolDemo{静态ExecutorServiceexecutorService=Executors.newSingleThreadExecutor();publicstaticvoidmain(String[]args){finalThreadthread1=newThread(newRunnable(){@Overridepublicvoidrun(){System.out.println("打开冰箱！");}});finalThreadthread2=newThread(newRunnable(){@Overridepublicvoidrun(){System.out.println("拿出一瓶牛奶！");}});finalThreadthread3=newThread(newRunnable(){@Overridepublicvoidrun(){System.out.println("关掉冰箱！");}});executorService.submit(thread1);executorService.submit(thread2);executorService.submit(thread3);executorService.shutdown();//使用完记得关闭线程池}}输出结果：打开冰箱！拿出一瓶牛奶！关冰箱！来源：blog.csdn.net/jqc874789596/article/details/100557300近期热点文章推荐：1.1000+Java面试题及答案（2022最新版）2.厉害了！Java协程来了。.3.SpringBoot2.x教程，太全面了！4.不要用爆破爆满画面，试试装饰者模式，这才是优雅的方式！！5.《Java开发手册（嵩山版）》最新发布，赶快下载吧！感觉不错，别忘了点赞+转发！
