Multiple threads: Thread synchronization code block

Java uses the keyword synchronized for thread synchronization with four sync blocks:

1. Example method

2. Static method

3. Synchronization blocks in the instance method

4. Synchronous block in static method

Instance method synchronization: Use the Synchronized keyword in the method declaration to synchronize on the object that owns the method

1   Public synchronized void Increase () {2          this. id++;    3  }

Static method synchronization: As with instance method synchronization, use the Synchronized keyword in the method declaration to synchronize on the class object that owns the method, while allowing only one thread to execute a static synchronization method in the same class

1  Public Static  synchronized void Increase () {2           this. id++;    3 }

Synchronization blocks in instance methods: Do not use the Synchronized keyword in the method declaration, but use synchronized to enclose part of the code in the method to synchronize

1   Public void Increase () {2         synchronized (this) {3            this. id++;    4         }5  }

Synchronous blocks in static methods: Similar to static method synchronization, do not use the Synchronized keyword in the method declaration, use synchronized to surround part of the code in the method, synchronize

1   Public Static void Increase () {2          synchronized (this) {3             this. id++;    4          }5   }

Multiple threads: Thread synchronization code block