1 class Province { 2     private int pid; 3     private String name; 4     private City citys [] ; 5     public void setCitys(City citys[]){ 6       this.citys=citys; 7       } 8     public City [] getCity(){ 9       return this.citys;10       }11     public Province (int pid,String name){12       this.pid=pid;13       this.name=name;14       }15     public String getInfo(){16      return "省份ID："+pid+" , 名称："+name;17      }18 }19 class City{20     private int cid;21     private String cname;22     private Province province;23     public void setProvince(Province province){24        this.province=province;25        }26     public Province getProvince(){27        return this.province;28        }29     public City(int cid,String cname){30     this.cid=cid;31     this.cname=cname;32     }33     public String getInfo(){34     return "城市ID："+cid+",城市名称："+cname;35     }36 }37 38 public class dare39 {public static void main(String args[]){40    City aa = new City(1,"江西");41    City bb = new City(2,"湖南");42    Province pr = new Province(0,"中国");43    aa.setProvince(pr);44    bb.setProvince(pr);45    pr.setCitys(new City[] {aa,bb});46    System.out.println("*****************开始取出省份信息****************");47    System.out.println(aa.getProvince().getInfo());48    System.out.println("*****************开始取出城市信息****************");49    System.out.println(pr.getInfo());50    for (int x = 0;x<pr.getCity().length ;x++ )51    {System.out.println("\t|-"+pr.getCity()[x].getInfo() );52    }53   System.out.println("*****************已经全部取出****************");54    }55 }

 1 class Province { 2     private int pid; 3     private String name; 4     private City citys [] ; 5     public void setCitys(City citys[]){ 6       this.citys=citys; 7       } 8     public City [] getCity(){ 9       return this.citys;10       }11     public Province (int pid,String name){12       this.pid=pid;13       this.name=name;14       }15     public String getInfo(){16      return "省份ID："+pid+" , 名称："+name;17      }18 }19 class City{20     private int cid;21     private String cname;22     private Province province;23     public void setProvince(Province province){24        this.province=province;25        }26     public Province getProvince(){27        return this.province;28        }29     public City(int cid,String cname){30     this.cid=cid;31     this.cname=cname;32     }33     public String getInfo(){34     return "城市ID："+cid+",城市名称："+cname;35     }36 }37 38 public class dare39 {public static void main(String args[]){40    City aa = new City(1,"江西");41    City bb = new City(2,"湖南");42    Province pr = new Province(0,"中国");43    aa.setProvince(pr);44    bb.setProvince(pr);45    pr.setCitys(new City[] {aa,bb});46    System.out.println("*****************开始取出省份信息****************");47    System.out.println(aa.getProvince().getInfo());48    System.out.println("*****************开始取出城市信息****************");49    System.out.println(pr.getInfo());50    for (int x = 0;x<pr.getCity().length ;x++ )51    {System.out.println("\t|-"+pr.getCity()[x].getInfo() );52    }53   System.out.println("*****************已经全部取出****************");54    }55 }