class Item {     // 父栏目

     private int iid ;

     private String name ;

     private String note ;

     private Subitem subitems [] ; //一个父栏目下有多个子栏目

     private Product products [] ; //一个栏目下包含多个商品

     public Item(int iid,String name,String note) {

         this.iid = iid ;

         this.name = name ;

         this.note = note ;

     }

     public void setSubitems(Subitem subitems[]) {

         this.subitems = subitems ;

     }

     public void setProducts(Product[] products) {

         this.products = products ;

     }

     public Product[] getProducts() {

         return this.products ;

     }

     public Subitem [] getSubitems() {

         return this.subitems ;

     }

     public String getInfo() {

         return "栏目编号：" + this.iid + "，名称：" + this.name + "，描述：" + this.note ;

     }

 }

 class Subitem {  // 子栏目

     private int sid ;

     private String name ;

     private String note ;

     private Item item ; // 一个子栏目对应一个父栏目

     private Product products [] ; //一个子栏目下包含多个商品

     public Subitem(int sid,String name,String note) {

         this.sid = sid ;

         this.name = name ;

         this.note = note ;

     }

     public void setItem(Item item) {

         this.item = item ;

     }

     public Item getItem() {

         return this.item ;

     }

     public void setProducts(Product products[]) {

         this.products = products ;

     }

     public Product[] getProducts() {

         return this.products ;

     }

     public String getInfo() {

         return "子栏目编号：" + this.sid + "，名称：" + this.name + "，描述：" + this.note ;

     }

 }

 class Product {  // 商品

     private int pid ;

     private String name ;

     private double price ;

     private Item item ;

     private Subitem subitem ;

     public Product(int pid,String name,double price) {

         this.pid = pid ;

         this.name = name ;

         this.price = price ;

     }

     public void setItem(Item item) {

         this.item = item ;

     }

     public Item getItem() {

         return this.item ;

     }

     public void setSubitem(Subitem subitem) {

         this.subitem = subitem ;

     }

     public Subitem getSubitem() {

         return this.subitem ;

     }

     public String getInfo() {

         return "商品编号：" + this.pid + "，名称：" + this.name + "，价格：" + this.price ;

     }

 }

 public class TestISP {

     public static void main(String args[]){

         //准备出单独的类对象

         Item item = new Item(1,"文具","-") ;

         Subitem suba = new Subitem(1001,"笔","-") ;

         Subitem subb = new Subitem(1002,"尺","-") ;

         Subitem subc = new Subitem(1003,"刀","-") ;

         Product proa = new Product(90001,"中性笔",2.0) ;

         Product prob = new Product(90002,"钢笔",10.0) ;

         Product proc = new Product(90003,"毛笔",8.0) ;

         Product prod = new Product(90004,"直尺",2.0) ;

         Product proe = new Product(90005,"三角尺",1.5) ;

         Product prof = new Product(90006,"美工刀",5.0) ;

         Product prog = new Product(90007,"剪刀",6.0) ;

         //设置类之间的引用关系

         suba.setItem(item) ;

         subb.setItem(item) ;

         subc.setItem(item) ;

         item.setSubitems(new Subitem[]{suba,subb,subc}) ;

         proa.setSubitem(suba) ;

         proa.setItem(item) ;

         prob.setSubitem(suba) ;

         prob.setItem(item) ;

         proc.setSubitem(suba) ;

         proc.setItem(item) ;

         prod.setSubitem(subb) ;

         prod.setItem(item) ;

         proe.setSubitem(subb) ;

         proe.setItem(item) ;

         prof.setSubitem(subc) ;

         prof.setItem(item) ;

         prog.setSubitem(subc) ;

         prog.setItem(item) ;

         suba.setProducts(new Product[] {proa,prob,proc}) ;

         subb.setProducts(new Product[] {prod,proe}) ;

         subc.setProducts(new Product[] {prof,prog}) ;

         item.setProducts(new Product[] {proa,prob,proc,prod,proe,prof,prog}) ;

         //取出数据

         //1、通过一个类型找到全部的子类型

         System.out.println(item.getInfo()) ;

         for (int x = 0;x <item.getSubitems().length ;x ++ ){

             System.out.println("\t|-" + item.getSubitems()[x].getInfo()) ;

         }

         System.out.println("--------------------------------------------------------------") ;

         System.out.println(item.getInfo()) ;

         for (int x = 0;x <item.getProducts().length ;x ++ ){

             System.out.println("\t|-" + item.getProducts()[x].getInfo()) ;

             System.out.println("\t|-" + item.getProducts()[x].getSubitem().getInfo()) ;

         }

         System.out.println("--------------------------------------------------------------") ;

         System.out.println(subb.getInfo()) ;

         for (int x = 0;x <subb.getProducts().length ;x ++ ){

             System.out.println("\t|-" + subb.getProducts()[x].getInfo()) ;

         }

     }

 }