运行程序，单击“启动线程”按钮，程序将启动一个线程，线程将进行数值计算，并将结果发送给主窗口；单击“挂起线程”按钮，线程将挂起；单击“恢复线程”按钮，线程将恢复。-Run the program, click" start the thread" button, the program will start a thread, the thread will make numerical computation, and sends the result to the main window