三种常用的对应list集合的双重遍历

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我是靠谱客的博主健忘小笼包，最近开发中收集的这篇文章主要介绍三种常用的对应list集合的双重遍历，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

三种常用的对应list集合的双重遍历，直接上代码

package com.collections.lists;

import java.util.ArrayList;
import java.util.Iterator;

import com.collections.lists.vo.Product;
import com.collections.lists.vo.ProductClassify;

public class ListTestDemo implements Runnable {

   public static void main(String[] args) {

       /***
       * 以下采用的是数据库的数据模拟
       */

       Product p = new Product();
       p.setId(1);
       p.setName("耐克");
       p.setPcId(1);
       p.setPrice(10);
       p.setNum(200);
       // 第一种产品
       ProductClassify pc = new ProductClassify();
       pc.setId(1);
       pc.setPcId(p.getPcId());
       pc.setpName("鞋子");

       Product p1 = new Product();
       p1.setId(2);
       p1.setName("馒头");
       p1.setPcId(2);
       p1.setPrice(20);
       p1.setNum(300);
       // 第二种产品
       ProductClassify pc1 = new ProductClassify();
       pc1.setId(2);
       pc1.setPcId(p.getPcId());
       pc1.setpName("食品");

       Product p2 = new Product();
       p2.setId(2);
       p2.setName("水密码");
       p2.setPcId(2);
       p2.setPrice(20);
       p2.setNum(300);
       // 第三种产品
       ProductClassify pc2 = new ProductClassify();
       pc2.setId(3);
       pc2.setPcId(p.getPcId());
       pc2.setpName("化妆品");

       Product p3 = new Product();
       p3.setId(4);
       p3.setName("杜冷丁");
       p3.setPcId(3);
       p3.setPrice(20);
       p3.setNum(300);
       // 第四种产品
       ProductClassify pc3 = new ProductClassify();
       pc3.setId(4);
       pc3.setPcId(p.getPcId());
       pc3.setpName("药品");

       // 向集合中保存
       ArrayList<Product> plist = new ArrayList<Product>();
       plist.add(p);
       plist.add(p1);
       plist.add(p2);
       plist.add(p3);
       ArrayList<ArrayList<Product>> pclist = new ArrayList<ArrayList<Product>>();
       pclist.add(plist);
       // pclist.add(pc);
       // pclist.add(pc1);
       // pclist.add(pc2);
       // pclist.add(pc3);

       // 遍历读出
       for (ArrayList<Product> arrayList : pclist) {

           for (Product product : arrayList) {
               // System.out.println("第一种打印方式    " + product.getName());
           }
       }
       Iterator<ArrayList<Product>> pclists = pclist.iterator();

       while (pclists.hasNext()) {
           ArrayList<com.collections.lists.vo.Product> arrayList = (ArrayList<com.collections.lists.vo.Product>) pclists
                   .next();
           Iterator<Product> pli = arrayList.iterator();

           while (pli.hasNext()) {
               Product product = (Product) pli.next();
               // System.out.println("第二种打印方式      " + product.getName());
           }
       }

       for (int i = 0; i < pclist.size(); i++) {

           plist = pclist.get(i);

           for (int j = 0; j < plist.size(); j++) {
               System.out
               .println("第三中打印方式          " + plist.get(j).getName());
           }
       }
       // System.out.println("单重集合" + plist.size());
       // System.out.println("双重集合" + pclist.size());
       Thread t1 = new Thread();
       t1.start();

   }

   @Override
   public void run() {
       // TODO Auto-generated method stub

       System.out.println("haha");

   }

}

package com.collections.lists.vo;

public class Product {

   @SuppressWarnings("product")
   private int id;

   private String name;

   private int pcId;//商品类型编号

   private int price;

   private int num;

   public Product() {
       // TODO Auto-generated constructor stub
   }

   public Product(int id, String name, int pcId, int price, int num) {
       super();
       this.id = id;
       this.name = name;
       this.pcId = pcId;
       this.price = price;
       this.num = num;
   }

   public int getId() {
       return id;
   }

   public void setId(int id) {
       this.id = id;
   }

   public String getName() {
       return name;
   }

   public void setName(String name) {
       this.name = name;
   }

   public int getPcId() {
       return pcId;
   }

   public void setPcId(int pcId) {
       this.pcId = pcId;
   }

   public int getPrice() {
       return price;
   }

   public void setPrice(int price) {
       this.price = price;
   }

   public int getNum() {
       return num;
   }

   public void setNum(int num) {
       this.num = num;
   }



}
package com.collections.lists.vo;

public class ProductClassify {

   @SuppressWarnings("productclassify")
   private int id;//编号

   private int pcId;//商品类型编号

   private String pName;//商品分类名字

   public ProductClassify() {
       // TODO Auto-generated constructor stub
   }

   public ProductClassify(int id, int pcId, String pName) {
       super();
       this.id = id;
       this.pcId = pcId;
       this.pName = pName;
   }

   public int getId() {
       return id;
   }

   public void setId(int id) {
       this.id = id;
   }

   public int getPcId() {
       return pcId;
   }

   public void setPcId(int pcId) {
       this.pcId = pcId;
   }

   public String getpName() {
       return pName;
   }

   public void setpName(String pName) {
       this.pName = pName;
   }

   @Override
   public String toString() {
       return "ProductClassify [id=" + id + ", pcId=" + pcId + ", pName="
               + pName + "]";
   }

}