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1、实验五继承与多态专业班级学号姓名实验学时2实验类型验证性实验地点软件工程实验室实验时间指导老师曹记东实验成绩年月日一、实验目的：理解继承与多态的概念，掌握三种访问控制的区别，掌握抽象类、接口与包的应用。二、实验内容：1.参考教材P112，示例程序C5_17，掌握抽象类的应用。2.参考教材P116，示例程序C5_19，掌握接口的使用方法。3.参考教材P121，示例程序C5_20，掌握包的使用方法。三、实验要求：1.完成示例程序的验证。2.写出实验报告。四、实验步骤与结果：（由学生按照实验内容完成）程序如下程序1.packaged;importjava.awt.*;impo
2、rtjava.applet.*;abstractclassShapes//定义一个抽象类Shapes{publicintx,y;//x、y为画图的坐标publicintwidth,height;publicShapes(intx,inty,intwidth,intheight){this.x=x;this.y=y;this.width=width;this.height=height;}abstractdoublegetArea();//求图形面积的抽象方法abstractdoublegetPerimeter();//求图形周长的抽象方法}classSquareexte
3、ndsShapes//由抽象类Shapes派生的子类——矩形类{publicdoublegetArea(){return(width*height);}publicdoublegetPerimeter(){return(2*width+2*height);}publicSquare(intx,inty,intwidth,intheight){6super(x,y,width,height);}}classTriangleextendsShapes//由抽象类Shapes派生的子类——三角形类{publicdoublec;//斜边publicdoublegetArea()
4、{return(0.5*width*height);}publicdoublegetPerimeter(){return(width+height+c);}publicTriangle(intx,inty,intbase,intheight){super(x,y,base,height);c=Math.sqrt(width*width+height*height);}}classCircleextendsShapes//由抽象类Shapes派生的子类——圆类{publicdoubler;//半径publicdoublegetArea(){return(r*r*Math.
5、PI);}publicdoublegetPerimeter(){return(2*Math.PI*r);}publicCircle(intx,inty,intwidth,intheight){super(x,y,width,height);r=(double)width/2.0;}}publicclassQextendsApplet{SquareBox=newSquare(5,15,25,25);Triangletri=newTriangle(5,50,8,4);CircleOval=newCircle(5,90,25,25);publicvoidpaint(Graph
6、icsg){//画正方形g.drawRect(Box.x,Box.y,Box.width,Box.height);g.drawString("BoxArea:"+Box.getArea(),50,35);g.drawString("BoxPerimeter:"+Box.getPerimeter(),50,55);g.drawString("triArea:"+tri.getArea(),50,75);g.drawString("triPerimeter:"+tri.getPerimeter(),50,95);//画圆g.drawOval(Oval.x,Oval.y,Ov
7、al.width,Oval.height);g.drawString("ovalArea:"+Oval.getArea(),50,115);}}运行结果6程序2.packagecc;importjava.awt.*;importjava.applet.*;interfaceShapes{abstractdoublegetArea();abstractdoublegetPerimeter();}classCoordinates{intx,y;publicCoordinates(intx,inty){this.x=x;this.y=y;}}/
