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This article mainly introduces the Java multithreading beginners need to learn the relevant knowledge, the content is detailed and easy to understand, the operation is simple and fast, has a certain reference value, I believe that after reading this Java multithreading beginners need to learn what content the article will have a harvest, let's take a look at it.

Introduction to Thread

Describes what is Java threading and the benefits of multithreading. Because Java is a pure object-oriented language, the threading model of Java is also object-oriented.

Create a thread with the Thread class

There are two ways to create threads in Java: using the Thread class and using the Runnable interface. Any Java program must have a main thread. To learn Java multithreading, you need to start by creating threads with the Thread class.

Create a thread using the Runnable interface

Explains how to create a thread using the Runnable interface. A class that implements the Runnable interface must use an instance of the Thread class to create a thread.

Life cycle of a thread

Like people with birth, aging, sickness and death, threads also go through four different states: start (wait), run, suspend, and stop. All four states can be controlled by methods in the Thread class.

Use of the join method

The function of the join method is to make the thread executing asynchronously into synchronous execution.

Use the volatile keyword carefully

The volatile keyword is used to declare simple type variables, such as int, float, boolean, and so on. There are certain restrictions on using it.

Three ways to pass data to a thread

Because the run and end of a thread is unpredictable, it is impossible to return data through function arguments and return statements as functions do when passing and returning data.

Two ways to return data from a thread

Returning data from a thread is similar to passing data to a thread. You can also return data through class members and callback functions.

Synchronize class methods using the Synchronized keyword

To achieve run method synchronization for Java multithreading, you need to add the synchronized keyword between void and public.

Use the Synchronized block synchronization method

Not only can we use synchronized blocks to synchronize an object variable, we can also use synchronized blocks to synchronize static and non-static methods in a class.

Use Synchronized blocks to synchronize variables

Explains how to use Synchronized blocks to synchronize variables. We can synchronize specific static or non-static methods through synchronized blocks.

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