What is synchronization? How many methods are there to achieve synchronization?

Add a synchronization lock to avoid being called by other threads before the thread completes the operation, thereby ensuring the uniqueness and accuracy of the variable; synchronization implementation method: 1. Synchronization code block; 2. Use special domain variables to achieve thread synchronization; 3. Use reentrant locks to achieve thread synchronization; 4. Use local variables to achieve thread synchronization.

The operating environment of this tutorial: Windows 7 system, Java 11 version. This method is suitable for all brands of computers.

Java allows multi-threaded concurrency control. When multiple threads operate a shareable resource variable at the same time (such as adding, deleting, modifying, and checking data), it will lead to inaccurate data and conflicts with each other, so add The synchronization lock prevents the thread from being called by other threads before it completes the operation, thereby ensuring the uniqueness and accuracy of the variable.

There are two ways to implement multi-threading in java:

1. Directly inherit the thread class;

2. Implement the runnable interface;

There are four ways to achieve synchronization:

1. Synchronization code block;

2. Use special domain variables (volatile) to achieve thread synchronization;

3. Use reentrancy locks to achieve thread synchronization;

4. Use local variables to achieve thread synchronization.

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