（7-7）阅读程序，写出程序运行结果。//写出程序运行结果classLeg{//腿privateintlength;publicLeg(intlength){this.length=length;}publicintgetLength(){returnlength;}publicvoidsetLength(intlength){this.length=length;}}classHead{//头privateStringtype;//类型publicHead(Stringtype){this.type=type;}publicStringgetType(){returntype;}publicvoidsetType(Stringtype){this.type=type;}}classPerson{privateStringname;//姓名privatecharsex;//性别privateLegleg;//腿privateHeadhead;//头publicPerson(Stringname){this.name=name;}publicPerson(Stringname,charsex){this(name);this.sex=sex;}publicLeggetLeg(){returnleg;}publicvoidsetLeg(Legleg){this.leg=leg;}publicHeadgetHead(){returnhead;}publicvoidsetHead(Headhead){this.head=head;}publicStringgetPerson(){StringBuffersb=newStringBuffer();sb.append(this.name+leg.getLength()+head.getType());returnsb.toString();}}//测试类publicclassDogDemo{publicstaticvoidmain(String[]args){Legleg=newLeg(30);Headhead=newHead("国字脸");Personzhangfei=newPerson("张飞",'男');zhangfei.setLeg(leg);zhangfei.setHead(head);leg.setLength(80);System.out.println(zhangfei.getPerson());}}