Understanding of Join methods in Thread class in C #

When calling the join method of another thread in the first-line thread, the thread is blocked until the end of the other thread is executed, such as Java code. 

1. Using System;
3. Namespace TestThreadJoin
4. {
5. Class Program
6. {
7. Static void Main ()
8. {
9. System. Threading. Thread x = new System. Threading. Thread (new System. Threading. ThreadStart (f1 ));
10. X. Start ();
11. Console. WriteLine ("This is Main. {0}", 1 );
12. X. Join ();
13. Console. WriteLine ("This is Main. {0}", 2 );
14. Console. ReadLine ();
15. }
16. Static void f1 ()
17. {
18. System. Threading. Thread y = new System. Threading. Thread (new System. Threading. ThreadStart (f2 ));
19. Y. Start ();
20. Y. Join ();
21. Console. WriteLine ("This is F1. {0}", 1 );
22. }
24. Static void f2 ()
25. {
26. Console. WriteLine ("This is F2. {0}", 1 );
27. }
28. }
29. }

There are three threads processing (including the main thread). You can check the execution result. Result: This is Main.1 This is F2.1 This is F1.1 This is Main.2
If: annotation // x. Join (); Result: This is Main.1 This is Main.2 This is F2.1 This is F1.1