Java multi thread simulation ticketing program and thread safety

• Java

In the knowledge of threads in Java, the ticketing program is very classic. There are also some problems in the program!

Demand: simulate three windows and sell 100 tickets at the same time.

Question 1: Why are 100 tickets sold and 300 tickets sold?

Reason: because tickets is non-static, one copy of non-static member variable data will be maintained in each object, and three thread objects will have three copies@ H_ 404_ 9@ solution: share the tickets to three thread objects. Use static modifier.

Question 2: is there a thread safety problem@ H_ 404_ 9@

Solution to thread safety problem: sun provides thread synchronization mechanism to solve this kind of problem.

Java thread synchronization mechanism:

Method 1: synchronize code blocks

Mode 2: synchronization function

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