Java简单类——多对多映射

 class Admin {
     private String aid ;
     private String password ;
     private Role role ;
     public Admin(String aid,String password) {
         this.aid =aid ;
         this.password = password ;
     }
     public void setRole(Role role) {
         this.role = role ;
     }
     public Role getRole() {
         return this.role ;
     }
     public String getInfo() {
         return "管理员编号：" + this.aid + "，密码：" + this.password ;
     }
 }
 class Role {
     private int rid ;
     private String title ;
     private Admin admins [] ;
     private Group groups [] ;
     public Role(int rid,String title) {
         this.rid = rid ;
         this.title = title ;
     }
     public void setAdmins(Admin [] admins) {
         this.admins = admins ;
     }
     public void setGroups(Group  groups[]) {
         this.groups = groups ;
     }
     public Group [] getGroups() {
         return this.groups ;
     }
     public Admin [] getAdmins() {
         return this.admins ;
     }
     public String getInfo() {
         return "角色编号：" + this.rid + "，名称：" + this.title ;
     }
 }
 class Group {
     private int gid ;
     private String title ;
     private Role roles [] ;
     private Action actions [] ;
     public Group(int gid,String title) {
         this.gid = gid ;
         this.title = title ;
     }
     public void setRoles(Role roles[]) {
         this.roles = roles ;
     }
     public void setActions(Action actions[]) {
         this.actions = actions ;
     }
     public Action [] getActions() {
         return this.actions ;
     }
     public Role [] getRoles() {
         return this.roles ;
     }
     public String getInfo() {
         return "权限组编号：" + this.gid + "，名称：" + this.title ;
     }
 }
 class Action {
     private int aid ;
     private String title ;
     private String url ;
     private Group group ;
     public Action(int aid,String title,String url) {
         this.aid = aid ;
         this.title = title ;
         this.url = url ;
     }
     public void setGroup(Group group) {
         this.group = group ;
     }
     public Group getGroup() {
         return this.group ;
     }
     public String getInfo() {
         return "权限编号：" + this.aid + "，名称：" + this.title + "，路径：" + this.url ;
     }
 }
 public class TestAdmin {
     public static void main (String args[]) {
         //第一步，设置完整关系
         //1、准备出若干个对象
         Admin a1 = new Admin("admin","hello") ;
         Admin a2 = new Admin("guest","hello") ;
         Admin a3 = new Admin("jiang","hello") ;
         Role r1 = new Role(1,"系统管理员") ;
         Role r2 = new Role(2,"信息管理员") ;
         Group g1 = new Group(10,"信息管理") ;
         Group g2 = new Group(11,"用户管理") ;
         Group g3 = new Group(12,"数据管理") ;
         Group g4 = new Group(13,"接口管理") ;
         Group g5 = new Group(14,"备份管理") ;
         Action at01 = new Action(1001,"新闻发布","-") ;
         Action at02 = new Action(1002,"新闻列表","-") ;
         Action at03 = new Action(1003,"新闻审核","-") ;
         Action at04 = new Action(1004,"增加用户","-") ;
         Action at05 = new Action(1005,"用户列表","-") ;
         Action at06 = new Action(1006,"登录日志","-") ;
         Action at07 = new Action(1007,"雇员数据","-") ;
         Action at08 = new Action(1008,"部门数据","-") ;
         Action at09 = new Action(1009,"公司数据","-") ;
         Action at10 = new Action(1010,"服务传输","-") ;
         Action at11 = new Action(1011,"短信平台","-") ;
         Action at12 = new Action(1012,"全部备份","-") ;
         Action at13 = new Action(1013,"局部备份","-") ;
         //2、设置对象之间的基本关系
         //设置管理员与角色
         a1.setRole(r1) ;
         a2.setRole(r2) ;
         a3.setRole(r2) ;
         r1.setAdmins(new Admin[] {a1}) ;
         r2.setAdmins(new Admin[] {a2,a3}) ;
         //设置角色与管理员组
         r1.setGroups(new Group[] {g1,g2,g3,g4,g5}) ;
         r2.setGroups(new Group[] {g1,g2}) ;
         g1.setRoles(new Role[] {r1,r2}) ;
         g2.setRoles(new Role[] {r1,r2}) ;
         g3.setRoles(new Role[] {r1}) ;
         g4.setRoles(new Role[] {r1}) ;
         g5.setRoles(new Role[] {r1}) ;
         //设置管理员组与权限
         g1.setActions(new Action[] {at01,at02,at03}) ;
         g2.setActions(new Action[] {at04,at05,at06}) ;
         g3.setActions(new Action[] {at07,at08,at09}) ;
         g4.setActions(new Action[] {at10,at11}) ;
         g5.setActions(new Action[] {at12,at13}) ;
         at01.setGroup(g1) ;
         at02.setGroup(g1) ;
         at03.setGroup(g1) ;
         at04.setGroup(g2) ;
         at05.setGroup(g2) ;
         at06.setGroup(g2) ;
         at07.setGroup(g3) ;
         at08.setGroup(g3) ;
         at09.setGroup(g3) ;
         at10.setGroup(g4) ;
         at11.setGroup(g4) ;
         at12.setGroup(g5) ;
         at13.setGroup(g5) ;
         //第二步：取出数据内容
         System.out.println(a1.getInfo()) ;
         System.out.println("\t|-" + a1.getRole().getInfo()) ;
         for (int x = 0 ;x < a1.getRole().getGroups().length ;x ++ ){
             System.out.println("\t|-" + a1.getRole().getGroups()[x].getInfo()) ;
             for (int y = 0 ;y< a1.getRole().getGroups()[x].getActions().length ;y ++ ){
                 System.out.println("\t\t\t|-" + a1.getRole().getGroups()[x].getActions()[y].getInfo()) ;
             }
         }
         System.out.println("-----------------------------------------------------------------") ;
         System.out.println(g2.getInfo()) ;
         for (int x = 0 ;x < g2.getRoles().length ; x ++ ){
             System.out.println("\t|-" + g2.getRoles()[x].getInfo()) ;
             for (int y = 0 ;y < g2.getRoles()[x].getAdmins().length ;y ++ ){
                 System.out.println("\t\t|-" + g2.getRoles()[x].getAdmins()[y].getInfo()) ;
             }
         }
     }
 }

这次使用了win7 自带的PowerShell，运行结果如下