Java类（1对多）
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 dare 39 {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 dare 39 {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 }
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