What are the precautions for Java daemon threads?

Notes

1. The daemon thread setting setDaemon(true) must be placed before start(), otherwise the program will error.

2. All child threads created in the daemon thread are daemon threads.

Using the jojn() method, whether the thread is a user thread or a daemon thread, it will wait for a thread to complete.

Example

public static void main(String[] args) throws InterruptedException {
    Thread thread = new Thread(new Runnable() {
        @Override
        public void run() {
            for (int i = 1; i <= 10; i++) {
                // 打印 i 信息
                System.out.println("i:" + i + ",isDaemon:" +
                            Thread.currentThread().isDaemon());
                try {
                    // 休眠 100 毫秒
                    Thread.sleep(100);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }
    });
    // 启动线程
    thread.start();
    // 设置为守护线程
    thread.setDaemon(true);
}

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