import ja c= new CircleNew(50);测试半径为给定值的圆形 c.setCircumference0:计算周长 import ja .setArea0: 计算面积 import s cp.setText("\n: CircleNew(50), ='+c.getcircumference0="+c.getArea0); public c r= new RectangleNew30,50)://测试高、宽为给定值的矩形 r.setCircumference(; Circlel r.setArea0; Rectalrp. setText(n矩形: Rectang小程序查器: TestShapes.ass Triang t= new TriangleNew(80, 100, Applet Label t.setCircumference(; 实现了绘图接口的图形类综合示例 t.setArea(; public 圆: CircleNew(50),周长=314.0面积=7850.0 tp.setText三角形: Triang 矩形: Rectanglenew(30,50),周长=160.0面积=1500.0 propublic void paint(Graphics三形 TriangleNew8005周00面积18036575 cp r.draw(g); / rp= r. fillcolor(g, Color. red); / tp c.draw(g); / err( c.illcolor Colorblue//月 add t.draw(g); setl t. fillcolor(g, Color.green); I/ set! 小程序已启动Java面向对象程序设计 3.6.2 接口的实现