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多线程顺序打印ABC的三种实现---join方法

【多线程顺序打印ABC的三种实现---join方法】 使用join方法，让三个线程之间存在等待关系
代码如下：

[java]view plain copy

  1. package com.zcj.join;
  3. public class JoinTest {
  4. public static void main(String[] args) {
  5. ThreadA threadA = new ThreadA();
  6. ThreadB threadB = new ThreadB(threadA);
  7. ThreadC threadC = new ThreadC(threadB);
  8. threadA.start();
  9. threadB.start();
  10. threadC.start();
  11. }
  12. }
  14. class ThreadA extends Thread{
  15. @Override
  16. public void run() {
  17. // TODO Auto-generated method stub
  18. System.out.println("A");
  19. }
  21. }
  22. class ThreadB extends Thread{
  23. private ThreadA threadA;
  24. public ThreadB(ThreadA threadA){
  25. this.threadA =threadA;
  26. }
  27. @Override
  28. public void run() {
  29. // TODO Auto-generated method stub
  30. try {
  31. threadA.join();
  32. } catch (InterruptedException e) {
  33. // TODO Auto-generated catch block
  34. e.printStackTrace();
  35. }
  36. System.out.println("B");
  37. }
  39. }
  40. class ThreadC extends Thread{
  41. private ThreadB threadB;
  42. public ThreadC(ThreadB threadB){
  43. this.threadB =threadB;
  44. }
  45. @Override
  46. public void run() {
  47. // TODO Auto-generated method stub
  48. try {
  49. threadB.join();
  50. } catch (InterruptedException e) {
  51. // TODO Auto-generated catch block
  52. e.printStackTrace();
  53. }
  54. System.out.println("C");
  55. }
  56. }
运行结果：

[plain]view plain copy
  1. A
  2. B
  3. C

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