一个图形界面程序，运行之后，让其中有一个线程能在界面上不断显示系统当前时间。另让一个线程可以在界面上提示当前系统时间下用户该做什么工作（例如当程序判断出系统时间现在是8：00到9：00，则提示用户该上课；现在是23：00到8：00，则提示用户该休息）。-A graphical program after running, let a thread continue to display the current system time (acquisition time query java.util.Calendar class interface, which contains multiple function is used to obtain the system time). Another so that a thread can interface prompts the user what to do under the current system time (for example, when the program determine the system time is from 8:00 to 9:00, the user is prompted to the class　now is 23:00 to 8: 00, then prompts the user for the rest).