What are the advantages and disadvantages of Java thread pool?

1. Disadvantages of not using a thread pool

It is very expensive to repeatedly create a thread system. The production and destruction of each thread takes time. If the task is relatively simple, the production and The resources consumed by destroying a thread may be greater than the resources consumed by the thread executing the task itself.

Too many threads occupy too many resources such as memory, which will cause too many context switches and make the system unstable.

2. Advantages of thread pool

Reduce resource consumption. By reusing threads that have already been created, the consumption caused by thread creation and destruction is reduced.

Improve response speed. When a task arrives, the task can be executed immediately until the thread completes.

The thread pool can manage resources uniformly. For example, the thread pool can uniformly manage task queues and threads, and can start or end tasks uniformly. It is more convenient and easier to manage than a single thread processing tasks one by one. It is also conducive to data statistics. For example, we can simply count the execution number of tasks.

What collection classes are there in Java?

Collections in Java are mainly divided into four categories:

1. List: ordered, repeatable;

2. Queue: ordered and repeatable;

3. Set: non-repeatable;

4. Map: unordered, with unique keys and non-unique values.

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