Java opens multiple threads, and then executes the main thread after execution is complete

One question, if 10 threads are opened, but after all 10 threads are executed, they are handed over to the main thread for unified input. How to achieve this? Below I paste the code:

    int count = 10;
        List<Thread> workers = new ArrayList<>();
        for(int i = 0; i < count; i++) {
            Thread worker = new Thread(new Runnable() {
                @Override
                public void run() {
                    System.out.println("执行子线程");
                }
            });
            worker.start();
            workers.add(worker);
        }
        for(int i = 0; i < count; i++) {
            workers.get(i).join();
        }
        System.out.println("执行主线程");

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After all threads start, wait for the thread execution to complete through the join method, and then execute the following main thread method when all threads are completed.