字典翻译 问答 其它 【定义一个抽象类SHAPE,在其中声明计算面积AREA()和周长PERINETER()方法,定义矩形类RECTANGLE和圆形类CI】
问题标题:
【定义一个抽象类SHAPE,在其中声明计算面积AREA()和周长PERINETER()方法,定义矩形类RECTANGLE和圆形类CI】
问题描述:

定义一个抽象类SHAPE,在其中声明计算面积AREA()和周长PERINETER()方法,定义矩形类RECTANGLE和圆形类CI

来秀海回答:
  我有个类似的,你看一下   importjava.awt.*;   importjava.applet.*;   abstractclassShapes   {   protectedintx,y,k;   protecteddoublem;   publicShapes(intx,inty,intk,doublem)   {this.x=x;this.y=y;   this.k=k;this.m=m;   }   abstractpublicdoublegetArea();   abstractpublicdoublegetPerimeter();   }   classRectextendsShapes   {publicdoublegetArea()   {return(k*m);}   publicdoublegetPerimeter()   {return(2*k+2*m);}   publicRect(intx,inty,intwidth,intheight)   {super(x,y,width,height);}   }   classTriangleextendsShapes   {publicdoublegetArea()   {return(Math.sqrt(m*(m-k)*(m-x)*(m-y)));}   publicdoublegetPerimeter()   {return(k+x+y);}   publicTriangle(intbaseA,intbaseB,intbaseC)   {super(baseA,baseB,baseC,0);   m=(baseA+baseB+baseC)/2.0;   }   }   classCircleextendsShapes   {publicdoublegetArea()   {return(m*m*Math.PI);}   publicdoublegetPerimeter()   {return(2*Math.PI*m);}   publicCircle(intx,inty,intwidth)   {   super(x,y,width,width/2.0);   }   }   publicclassRunShapeextendsApplet   {Rectrect=newRect(5,15,25,25);   Triangletri=newTriangle(5,5,8);   Circlecir=newCircle(13,90,25);   publicvoidpaint(Graphicsg)   {   g.drawRect(rect.x,rect.y,rect.k,(int)rect.m);   g.drawString("RectArea:"+rect.getArea(),50,35);   g.drawString("RectPerimeter:"+rect.getPerimeter(),50,55);   g.drawString("TriangleArea:"+tri.getArea(),50,75);   g.drawString("TrianglePerimeter:"+tri.getPerimeter(),50,95);   g.drawOval(cir.x-(int)cir.k/2,cir.y-(int)cir.k/2,cir.k,cir.k);   g.drawString("CircleArea:"+cir.getArea(),50,115);   g.drawString("CirclePerimeter:"+cir.getPerimeter(),50,135);   }   }
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