接口比较两个圆和圆柱的大小

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1、比较两个圆和两个圆柱的大小：package圆;//定义包publicinterfaceCircle{publicdoublePI=3.1415;//定义PIpublicintcompearTo(Objecto);}package圆;publicclassCircleimplimplementsCircle{doubler;Circleimpl(doubler){this.r=r;}publicdoublegetAear(){//计算面积returnPI*r*r;}publicintcompear

2、To(Objecto){doublethisAear=getAear();Circleimplobj=(Circleimpl)o;//超类应用变量执行强制类型转换后才能赋予子类量doubleobjArea=obj.getAear();if(thisAear>objArea){return1;}elseif(thisAear==objArea)return0;elsereturn-1;}}package圆;publicclassColumnimplementsCircle{doubler,h;Co

3、lumn(doubler,doubleh){this.r=r;this.h=h;}publicdoublegetArea(){returnr*h*PI*r;}publicintcompearTo(Objecto){doublethisArea=getArea();Columnobj=(Column)o;doubleobjArea=obj.getArea();if(thisArea>objArea)return1;elseif(thisArea==objArea)return0;elseretur

4、n-1;}}package圆;publicclassCircletest{publicstaticvoidmain(String[]args){Circleimplzh1=newCircleimpl(1);Circleimplzh2=newCircleimpl(3);inti=zh1.compearTo(zh2);//比较两个圆面积的大小switch(i){case1:System.out.println("圆1比圆2大");break;case0:System.out.println("圆1等

5、于圆2");break;case-1:System.out.println("圆1小于圆2");break;}Columnzh3=newColumn(3,3);Columnzh4=newColumn(3,3);intj=zh3.compearTo(zh4);switch(j){case1:System.out.println("圆柱1比圆柱2大");break;case0:System.out.println("圆柱1等于圆2柱");break;case-1:System.out.println

6、("圆柱1小于圆2柱");break;}}}