java定义一个接口

将以下四个文件放在同一个目录下编译运行: 文件1: /**MyApp.java**/ public class MyApp { public static void main(String[] args) { IBaseGraphics c1 = new Circle(5); IBaseGraphics r1 = new Rectangle(3,4); c1.printData(); r1.printData(); } } 文件2: /