java面向对象程序设计上机实践

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1、JAVA面向对象程序设计上机实践1.定义一个接口，接口中有四个抽象方法：求面积方法、求周长方法、显示面积方法及显示周长方法。定义Circle类和Rectangle类分别实现接口，在主类中实现显示圆和矩形的面积和周长。2.重写上面的程序，要求矩形，圆的类放到不同的包中，用包的技术组织程序的设计。同时要求程序能从键盘上接受数据以便求解不同的几何图形的周长面积。1.publicinterfaceJ_Shape{publicabstractdoublemb_getArea();publicabstractdo

2、ublemb_getPerimeter();}publicclassJ_CircleimplementsJ_Shape{publicdoublem_radius;publicJ_Circle(doubler){m_radius=r;}publicdoublemb_getArea(){return(Math.PI*m_radius*m_radius);}publicdoublemb_getPerimeter(){return(Math.PI*2*m_radius);}publicstaticvoidma

3、in(Stringargs[]){J_Shapea=newJ_Circle(5);System.out.println("theareaofcircleis:"+a.mb_getArea());System.out.println("theperimeterofcircleis"+a.mb_getPerimeter());}}publicclassRectangleimplementsJ_Shape{publicdoublelongs,wides;publicRectangle(doublel,dou

4、blew){longs=l;wides=w;}publicdoublemb_getArea(){return(longs*wides);}publicdoublemb_getPerimeter(){return(2*(longs+wides));}publicstaticvoidmain(Stringargs[]){J_Shapea=newRectangle(2,3);System.out.println("theareaofrectangleis:"+a.mb_getArea());System.o

5、ut.println("theperimeterofrectangleis:"+a.mb_getPerimeter());}}2.publicinterfaceJ_Shape{publicabstractdoublemb_getArea();publicabstractdoublemb_getPerimeter();}importjava.io.BufferedReader;importjava.io.IOException;importjava.io.InputStreamReader;public

6、classJ_SquareimplementsJ_Shape{publicdoubleradious;publicJ_Square(doublex){radious=x;}publicdoublemb_getArea(){return(Math.PI*radious*radious);}publicdoublemb_getPerimeter(){return(Math.PI*radious*2);}publicstaticvoidmain(Stringargs[])throwsIOException{

7、BufferedReaderinput=newBufferedReader(newInputStreamReader(System.in));System.out.print("Enteronenumber:");intnumber=Integer.parseInt(input.readLine());J_Shapea=newJ_Square(number);System.out.println("theareaofcircleis:"+a.mb_getArea());System.out.print

8、ln("theperimeterofcircleis:"+a.mb_getPerimeter());}}importjava.io.BufferedReader;importjava.io.IOException;importjava.io.InputStreamReader;publicclassRectangleimplementsJ_Shape{publicdoublelongs,wides;publicRectangle(doublel,doub