notes.txt

书籍"Java_面向事件编程"的附带光盘代码

This program draws a bunch of basketballs on the screen so
that we can watch them bounce randomly.  Each click
adds a ball to the display.  Leaving the canvas makes
the balls temporarily vanish.  Moving the mouse back
into the canvas makes the balls reappear and bounce
for a while.  It demonstrates the use of an array to keep track
of a variable number of objects.