Click to edit Master title styleClick to edit Master text stylesSecond levelThird levelFourth levelFifth levelFeatures of JavaCS 3331Fall 20091OutlineAbstract classInterfaceApplication --- animation a

第一单元练习题1????考察以下代码片断：abstract class Shape{????int length????int breadth????abstract void draw()}class Rectangle extends Shape????{????void draw()????{????????(Draw a rectangle)????}}public class Dr