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Java thread creation methods, many novices are not very clear about this, in order to help you solve this problem, the following editor will explain for you in detail, people with this need can come to learn, I hope you can gain something.

1. Inherit the Thread class to create a thread

Thread itself implements the runnable interface, which represents an instance of a thread. Inheriting the Thread class requires overriding the run method of the parent class. Call its own start method to start a thread. The run method is called at the bottom of the start method. Here I write the ExtendThread class to inherit the Thread class and override the run method. So ExtendThread is a thread class. Then call start in the test class to start a thread.

ExtendThread class

Implement the Runnable interface

The ImplCallable class implements the Callable interface

Here we take a look at the structure diagram of the FutureTask wrapper: FutureTask indirectly implements the Runnable and Future interfaces, which can wrap the Runnabl. Expand the functions such as monitoring.

4. Create threads through a thread pool.

From the above, we want a thread to create a thread, which is also very convenient to implement, but in fact, if there are more concurrent threads, and each thread has a shorter execution time, in this way, thread resources will be created frequently, which will greatly reduce the performance of the system. Usually, we can solve this problem with thread pool. first, when the service starts, we can start several threads and use a container (such as thread pool) to manage these threads.

Java provides Executors tools to create different types of thread pools for developers. Here we briefly talk about the newFixedThreadPool method. Later, we will learn more about the implementation principle of thread pool. The newFixedThreadPool method creates a fixed capacity thread pool here I initialize 10.

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