有T1、T2、T3三个线程,怎么让三个线程顺序执行?T1执行结束T2执行,T2执行结束T3执行。join()方法 public static void main(String[] args) throws InterruptedException { Thread t1 = new Thread(()->{ try { Thread.sleep(2000); } catch (InterruptedException e) { e.printStackTrace(); } System.out.pr...