实验目的：1.在类中创建新方法。

　　　　　　 2.在类的其它方法中调用该方法。

问题描述：修改《Java程序设计教程》中图8.7的Time3类，增加tick

方法，该方法使存储在Time3对象中的时间增加1秒钟。此外，提供增加minute的incrementMinute方法，以及增加hour的incrementHour方法。Time3对象应总是保持一致状态。修改《Java程序设计教程》中图8.8的applet TimeTest4，以测试Time3对象的tick方法、incrementMinute方法和incrementHour方法，以确保他们能正常工作。

-Experimental purposes: 1. Create a new method in the class. Two other methods in the class call the method. Problem Descr iption: to modify the Java programming tutorial in 8.7 Time3 class, increase the tick method, the method Time3 object increased by 1 second. In addition, the increase in the minute incrementMinute, as well as increase the hour of incrementHour methods. The time3 object should always maintain a consistent state. Modify the Java programming tutorial " in Figure 8.8 the applets TimeTest4 of the tick test Time3 object incrementMinute methods and incrementHour of methods to ensure they work properly.