Sleep-Join方法理解

 package cn.mayday.test;

 public class JoinTest {

     public static void main(String[] args) {

         try {

             int count = 50;
             // while (count > 1) {

             Thread thread1 = new Thread(
                     new Runnable() {
                         public void run() {

                             try {
                                 System.out.println("+++++ 1111 start ++++");
                                 Thread.sleep(10000);
                                 System.out.println("+++++ 1111 end ++++");
                             } catch (Exception e) {
                                 System.out.println("Exception 1111 = " + e);
                             }
                         }
                     }
             );
             thread1.start();

             Thread thread2 = new Thread(
                     new Runnable() {
                         public void run() {
                             try {
                                 System.out.println("+++++ 2222 start ++++");
                                 Thread.sleep(10000);
                                 System.out.println("+++++ 2222 end ++++");

                             } catch (Exception e) {
                                 System.out.println("Exception 2222 = " + e);
                             }
                         }
                     }
             );
             thread2.start();

             thread1.join();
             System.out.println("++++++++++++ thread1111 join end ++++++++++++");

             thread2.join();
             System.out.println("++++++++++++ thread2222 join end ++++++++++++");

             Thread.sleep(1000);
             // }

         } catch (Exception e) {
             System.out.println("Exception = " + e);
         }

     }
 }

【总结】：从结果可以看出，主线程在线程1和线程2 join本身不阻塞，当时需要main线程做得动作全部阻塞

摘自