Java类（多项1对多映射）

class Province {
    private int pid;
    private String name;
    private Stata stata;
    private City citys [] ;
    public void setStata(Stata stata){
      this.stata=stata;
      }
    public Stata getStata(){
      return this.stata;
      }
    public void setCitys(City citys[]){
      this.citys=citys;
      }
    public City [] getCity(){
      return this.citys;
      }
    public Province (int pid,String name){
      this.pid=pid;
      this.name=name;
      }
    public String getInfo(){
     return "省份ID："+pid+" , 名称："+name;
     }
}
class City{
    private int cid;
    private String cname;
    private Province province;
    private Stata stata;
    public void setStata(Stata stata){
      this.stata=stata;
      }
    public Stata getStata(){
      return this.stata;
      }
    public void setProvince(Province province){
       this.province=province;
       }
    public Province getProvince(){
       return this.province;
       }
    public City(int cid,String cname){
    this.cid=cid;
    this.cname=cname;
    }
    public String getInfo(){
    return "城市ID："+cid+",城市名称："+cname;
    }
}
class  Stata {
    private int id;
    private String sname;
    private Province prs [] ;
    private City citys [];
    public void setCitys(City citys [] ){
       this.citys=citys;
       }
    public City [] getCitys(){
       return this.citys;
       }
    public void setPrs(Province prs [] ){
      this.prs=prs;
      }
    public Province [] getPrs(){
      return this.prs;
      }
    public Stata(int id,String sname){
     this.id=id;
     this.sname=sname;
     }
   public String getInfo(){
    return "国家ID："+id+"，国家名称："+sname;
    }
}
public class dare
{public static void main(String args[]){
   City cd = new City(7,"南昌");
   City cc = new City(6,"宜春");
   City cb = new City(5,"广州");
   City ca = new City(4,"深圳");
   Province pb = new Province(3,"江西");
   Province pa = new Province(2,"广东");
   Stata st = new Stata(1,"中国");
   pa.setStata(st);
   pb.setStata(st);
   st.setPrs(new Province [] {pa,pb});
   cd.setProvince(pb);
   cc.setProvince(pb);
   cb.setProvince(pa);
   ca.setProvince(pa);
   pb.setCitys(new City[] {cd,cc});
   pa.setCitys(new City[] {cb,ca});
   cd.setStata(st);
   cc.setStata(st);
   cb.setStata(st);
   ca.setStata(st);
   st.setCitys(new City[] {cd,cc,cb,ca});
   System.out.println(ca.getStata().getInfo());
   System.out.println("***************开始取出数据****************");//通过国家查找全部对应省份信息
   for (int a =0;a<st.getPrs().length ;a++ ){
       System.out.println(st.getPrs()[a].getInfo());
   }
    System.out.println("***************开始取出数据****************");//通过国家查找全部城市信息 以及全部对应省份信息
   for (int b =0;b<st.getCitys().length ;b++ ){
       System.out.println(st.getCitys()[b].getInfo());
       System.out.println("\t|-"+st.getCitys()[b].getProvince().getInfo());
   }
  System.out.println("***************开始取出数据****************");//通过省份查找对应城市信息
   System.out.println(pa.getInfo());
   for (int x =0;x<pa.getCity().length ;x++ )
   {System.out.println(pa.getCity() [x].getInfo());
   }
   }
}