notes.txt~

书籍"Java_面向事件编程"的附带光盘代码

This program allows the user to create several different types of objects on
the canvas.  The last object created can be moved by dragging it. The user can 
also change the color of the last shape created by using the buttons along the 
bottom of the window.  This program demonstrates the use of the JComboBox and 
JButton GUI components, as well as listeners for the JComboBox and JButtons.