Java简单类——一对多映射（省、市）

class Province {
    private int pid ;
    private String name ;
    private City cities [] ;
    public Province (int pid,String name) {
        this.pid = pid ;
        this.name = name ;
    }
    public void setCities(City cities[] ){
        this.cities = cities ;
    }
    public City[] getCities() {
        return this.cities ;
    }
    public String getInfo() {
        return "省份编号：" + this.pid + "，名称：" + this.name ;
    }
}
class City {
    private int cid ;
    private String name ;
    private Province province ;
    public City (int cid,String name) {
        this.cid = cid ;
        this.name = name ;
    }
    public void setProvince(Province province){
        this.province = province ;
    }
    public Province getProvince() {
        return this.province ;
    }
    public String getInfo() {
        return "城市编号：" + this.cid + "，名称：" + this.name ;
    }
}
public class TestPC{
    public static void main(String args[]){
        Province pro = new Province (1,"湖北");
        City c1 = new City (1001,"武汉") ;
        City c2 = new City (1002,"孝感") ;
        City c3 = new City (1003,"宜昌") ;
        City c4 = new City (1004,"黄石") ;
        c1.setProvince(pro) ;
        c2.setProvince(pro) ;
        c3.setProvince(pro) ;
        c4.setProvince(pro) ;
        pro.setCities(new City [] {c1,c2,c3,c4}) ; //一个省份有多个城市
        System.out.println(c2.getProvince().getInfo()) ;
        for (int x = 0 ;x < pro.getCities().length ;x ++ ){
            System.out.println("	|-" + pro.getCities()[x].getInfo()) ;
        }
    }
}