java web编程技术(沈泽刚,清华大学出版社)第十四章课后习题部分解答

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1、Book14_1publicclassBook14_1{publicstaticvoidmain(String[]args){GeometricObjectgeoObject1=newCircle(5);GeometricObjectgeoObject2=newRectangle(5,3);System.out.println("Thetwoobjectshavethesamearea?"+equalArea(geoObject1,geoObject2));displayGeometricObject(geoObject1);displayGeometricObject(geoObje

2、ct2);}publicstaticbooleanequalArea(GeometricObjectobject1,GeometricObjectobject2){returnobject1.getArea()==object2.getArea();}publicstaticvoiddisplayGeometricObject(GeometricObjectobject){System.out.println();System.out.println("Theareais"+object.getArea());System.out.println("Theperimeteris"+ob

3、ject.getPerimeter());}}abstractclassGeometricObject{privateStringcolor="white";privatebooleanfilled;privatejava.util.DatedateCreated;protectedGeometricObject(){dateCreated=newjava.util.Date();}protectedGeometricObject(Stringcolor,booleanfilled){dateCreated=newjava.util.Date();this.color=color;th

4、is.filled=filled;}publicStringgetColor(){returncolor;}publicvoidsetColor(Stringcolor){this.color=color;}publicbooleanisFilled(){returnfilled;}publicvoidsetFilled(booleanfilled){this.filled=filled;}publicjava.util.DategetDateCreated(){returndateCreated;}publicStringtoString(){return"createdon"+da

5、teCreated+"color:"+color+"andfilled:"+filled;}publicabstractdoublegetArea();publicabstractdoublegetPerimeter();}classCircleextendsGeometricObject{privatedoubleradius;publicCircle(){}publicCircle(doubleradius){this.radius=radius;}publicCircle(doubleradius,Stringcolor,booleanfilled){this.radius=

6、radius;setColor(color);setFilled(filled);}publicdoublegetRadius(){returnradius;}publicvoidsetRadius(doubleradius){this.radius=radius;}publicdoublegetArea(){returnradius*radius*Math.PI;}publicdoublegetPerimeter(){return2*radius*Math.PI;}publicvoidprintCircle(){System.out.println("Thecircleiscreat

7、ed"+getDateCreated()+"andtheradiusis"+radius);}}classRectangleextendsGeometricObject{privatedoublewidth;privatedoubleheight;publicRectangle(){}publicRectangle(doublewidth,doubleheight){this.width=width;this.height=height;}pu