【java】ArrayList、Iterator用法

 1 package com.tn.collect;
 2 
 3 import java.util.ArrayList;
 4 import java.util.Iterator;
 5 
 6 class Product{
 7     public Product() {
 8         super();
 9         // TODO Auto-generated constructor stub
10     }
11     public Product(int id, String name, int price) {
12         // TODO Auto-generated constructor stub
13         setId(id);
14         setName(name);
15         setPrice(price);
16     }
17     private int id;
18     private String name;
19     private double price;
20     public int getId() {
21         return id;
22     }
23     public void setId(int id) {
24         this.id = id;
25     }
26     public String getName() {
27         return name;
28     }
29     public void setName(String name) {
30         this.name = name;
31     }
32     public double getPrice() {
33         return price;
34     }
35     public void setPrice(double price) {
36         this.price = price;
37     }
38     @Override
39     public String toString() {
40         return "Product [> price
41                 + "]";
42     }
43 }
44 public class ArrayListLearning {
45     public static void main(String[] args){
46         Product product1=new Product(1001,"奇瑞",99999);
47         Product product2=new Product(1002,"江淮",88888);
48         Product product3=new Product(1003,"比亚迪",77777);
49         ArrayList arrayList=new ArrayList();
50         arrayList.add(product1);
51         arrayList.add(product2);
52         arrayList.add(product3);
53         System.out.println(arrayList);//会打印容器中每个对象的toString
54         System.out.println(arrayList.size());
55         Object object=arrayList.get(0);
56         System.out.println(object);
57         Product product=(Product)arrayList.get(0);
58         System.out.println(arrayList.get(0));
59         Product product4=new Product(1004,"力帆",66666);
60         Product product5=new Product(1005,"吉利",55555);
61         Product productx=new Product(1005,"吉利",55555);
62         ArrayList<Product> list=new ArrayList<Product>();
63         list.add(product4);
64         list.add(product5);
65         Product product6=list.get(0);
66         System.out.println(product6);
67         
68         //遍历方法一：
69         for(int i=0;i<list.size();i++){
70             Product pro=list.get(i);
71             System.out.println(pro);
72         }
73         
74         //遍历方法二：
75         Iterator<Product> iterator=list.iterator();
76         while(iterator.hasNext()){
77             Product pro=iterator.next();
78         }
79         
80         //遍历方法三：
81         for(Object obj:list){
82             Product pro=(Product)obj;
83         }
84         
85         System.out.println(list.contains(product5));
86         System.out.println(list.contains(productx));//对象创建是两个，但实际应用中这两个对象应该是一个
87     }
88 }

ArrayList