java题定义一个圆类 计算圆的面积和周长

就是类里面定义的一个字符串,数值,list,map等这样的一个变量或者常量/***这是Manager类*/publicclassManager{Stringusername="张三";//定义Mana

//图形类作父类publicclassDiagram{\x09//计算面积\x09publicdoublearea(){return0;}}//圆类:继承图形类publicclassCrileexte

周长：形成整个圆的那条曲线的长度叫圆的周长.面积：组成员的那条曲线中的面积,就是圆的面积.

classscore{privatedoubleenglish;publicvoidsetScore(doubleenglish){this.english=english;}publicvoidpr

importjava.util.Scanner;classRound{\x09publicdoubleperimeter(doubleradius){\x09\x09returnradius*2;\x

classCircle{\x09privatedoubler;\x09publicvoidsetR(doubler)\x09{\x09\x09this.r=r;\x09}\x09publicdoubl

publicdoubleM(doubleR){return0.5*3.14*R*R;}publicdoubleV(doubleR){return4/3*3.14*R*R*R;}

packagecircle;publicclassEasy{privatedoubleBj;privatestaticdoublePi=3.1415;publicdoublegetBj(){retur

输出三角形的什么啊再问：周长再答：哦，这个简单importjava.util.Scanner;publicclassCircumference{publicstaticvoidmain(String[

定义和初始化要分清int[][]array;array=newint[][]{{1,1}{2,2}};int[][]array=newint[2][2];int[][]array=newint[][]

类似的问题,在知道里面不知道有多少.搜索一下.

这个是三角圆和矩形的,你参考下,可以计算面积和周长publicclassHHsa{publicstaticvoidmain(String[]args){Geometricg=newTriangle(3

publicclassTest{\x05publicstaticvoidmain(String[]args){\x05\x05Rectangler=newRectangle(5,4);\x05\x05

packagecom.test;publicclassComplexNum{\x05//Z=a+bi\x05privateintRez;\x05//实部\x05privateintImz;\x05//

publicclassPoint{privatedoublex;privatedoubley;publicPoint(doublex,doubley){this.x=x;this.y=y;}publi

classClock{privateinthourse;privateintminute;privateintsecond;publicClock(){this.hourse=0;this.minut

publicclassTriangle{\x09inta;\x09intb;\x09intc;\x09publicTriangle(inta,intb,intc){\x09\x09this.a=a;\

publicclassCircle{privatedoubleradius;publicCircle(doubler){this.radius=r;}publicstaticvoidmain(Stri

publicclassRectangle{\x09\x09privateintw;\x09\x09privateinth;\x09\x09publicRectangle(){\x09\x09}\x09

//计算矩形的面积publicclassRectArea{\x09publicstaticdoublegetArea(doublewidth,doublehigth){\x09\x09doublear