一个简易关于图书管理适合刚开始学习javaGUI的学习者参考，主要是图形界面的使用。-A simple library management for just about to start learning javaGUI reference learners, mainly to use graphical interface.

按键改变字体颜色，javaGui测试，只要按键就能改变字体颜色-Press the button to change the color of the word