JAVA定义一个圆类circle,描述圆对象

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

publicabstractclassShape{publicabstractdoublearea();}----------------------------------------------

首先里面的是参数,你这里之传入一个参数,long是参数的类型,num是参数的名称,比如在别的地方调用此方法,它必须要传入一个long的参数,如publicvoidxx(){longxx=5;rever

publicclassMyMath{privatestaticvoidmax(intx,inty,intz){if(x>y){if(x>z){System.out.println("最大数是X："+x

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

classTriangle{inta,b,c,l;publicstaticvoidperimeter(){l=a+b+c;}}publicclassTriangleTest{publicstaticv

publicclassTriangle{intedge1;intedge2;intedge3;Triangle(inta,intb,intc){edge1=a;edge2=b;edge3=c;doub

publicclassComplexDemo{//main方法publicstaticvoidmain(String[]a){Complexb=newComplex(2,5);Complexc=new

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[][]

我帮你

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

非必须,但一般做开发的话还是需要定义.不定义的话不能使用无参的构造函数.

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

publicclassZhengfangxing{privateintl;publicZhengfangxing(intl){//有参构造函数this.l=l;}publicintgetL