static void Main(string[] args)
        {
            new Thread(WriteX).Start();
            new Thread(WriteY ).Start();
            WriteZ();
            Console.ReadKey();
        }
        static void WriteX()
        {
            Console.WriteLine($"线程编号X:{Thread.CurrentThread.ManagedThreadId}");
            for (int i = 0; i < 1000; i++)
                Console.Write("x");
        }
        static void WriteY()
        {
            Console.WriteLine($"线程编号Y:{Thread.CurrentThread.ManagedThreadId}");
            for (int i = 0; i < 1000; i++)
                Console.Write("y");
        }
        static void WriteZ()
        {
            Console.WriteLine($"线程编号Z:{Thread.CurrentThread.ManagedThreadId}");
            for (int i = 0; i < 1000; i++)
                Console.Write("z");
        }
    }