新手疑问。关于封装的思想动态数组arraylist解决方案

新手疑问。关于封装的思想动态数组arraylist

Java code

import java.util.ArrayList;public class StrDemo {        public static void main(String[] args) {        ArrayList ary=new ArrayList();        Str st=new Str("Dacid Clarke","10 Doening Street","LondnState : London",                "United Kingdom","110022");        Str st1=new Str("John Lenon","12 Park Avenue","CliforniaState : CaliFornia",                "USA","210033");        Str st2=new Str("Stefii Graff","14 Mape Lane","LondonState : Sydney","Australia","412033");        ary.add(st.getArry());                for(int i=0;i<=5;i++){            System.out.println(ary.get(i));            }    }}

Java code

import java.util.ArrayList;public class Str {    private ArrayList arry=new ArrayList();    private String name;    private String Street;    private String City;    private String Country;    private String Picde;        public Str(String str,String st2,String st3,String st4,String st5){        name=str;        Street=st2;        City=st3;        Country=st4;        Picde=st5;    }    public void setArry(){        arry.clear();        arry.add(name);        arry.add(Street);        arry.add(City);        arry.add(Country);        arry.add(Picde);    }    public ArrayList getArry(){        return arry;    }    public void print(){        for(int i=0;i<5;i++){        System.out.println(arry.get(i));            }        }}

 这代码报错，好像是出在size和index上。。
请高手帮我改一下那里错了，用封装的话是怎么写。。我都搞不清我弄的是不是封装
原题目是
编写一个程序，使用ArrayList存储客户的邮件地址。地址中应该包含姓名，街道，市（县）,省，国家，和代码，然后显示ArrayList中的内容，此程序的输出结果该显示如下:
客户的邮件地址

[Name: Dacid Clarke
Street :10 Doening Street
City : LondonState : London
Country : United Kingdom
Picde : 110022

Name: John Lenon 
Street :12 Park Avenue
City : CliforniaState : California
Country : USA
Picde : 210033

Name:Stefii Graff
Street : 14 Mape Lane
City : LondonState : Sydney
Country : Australia
Picde : 412033]


[解决办法]
首先用户信息肯定封装成一个类，例如User ，然后ArrayList里面存放User

根据你的代码修改的

Java code

import java.util.ArrayList; class Str {    private String name;    private String Street;    private String City;    private String Country;    private String Picde;        public Str(String str,String st2,String st3,String st4,String st5){        name=str;        Street=st2;        City=st3;        Country=st4;        Picde=st5;    }        public String toString(){        StringBuffer sb = new StringBuffer();        sb.append("name :").append(name).append("\n");        sb.append("Street :").append(Street).append("\n");        sb.append("City :").append(City).append("\n");        sb.append("Country :").append(Country).append("\n");        sb.append("Picde :").append(Picde).append("\n");                return sb.toString();    }}public class StrDemo {        public static void main(String[] args) {        ArrayList<Str> ary=new ArrayList<Str>();        Str st=new Str("Dacid Clarke","10 Doening Street","LondnState : London",                "United Kingdom","110022");        Str st1=new Str("John Lenon","12 Park Avenue","CliforniaState : CaliFornia",                "USA","210033");        Str st2=new Str("Stefii Graff","14 Mape Lane","LondonState : Sydney","Australia","412033");                        ary.add(st);        ary.add(st1);        ary.add(st2);                for(int i=0;i<ary.size();i++){            System.out.println(ary.get(i));            }    }}
[解决办法]
UserInfo.java
Java code
package com.hundsun.zhoujl;/** * @author zhoujl  * 2011/12/27 14:37:27 */public class UserInfo {    private String name;    private String street;    private String city;    private String country;    private String picde;            /**     * @param name     * @param street     * @param city     * @param country     * @param picde     */    public UserInfo(String name, String street, String city, String country,            String picde) {        super();        this.name = name;        this.street = street;        this.city = city;        this.country = country;        this.picde = picde;    }        public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public String getStreet() {        return street;    }    public void setStreet(String street) {        this.street = street;    }    public String getCity() {        return city;    }    public void setCity(String city) {        this.city = city;    }    public String getCountry() {        return country;    }    public void setCountry(String country) {        this.country = country;    }    public String getPicde() {        return picde;    }    public void setPicde(String picde) {        this.picde = picde;    }    @Override    public String toString() {        return "Name:"+name+"\n"+"Street:" + street+"\n"+"City:"+city+"\n"        +"Country:"+country+"\n"+"Picde:"+picde;    }        }
[解决办法]
探讨


7楼 封装在一个类就是用的toString方法吗 然后ArrayList<Str> ary=new ArrayList<Str>();

这个语句 <>这个我还是第一次看到 能不能解释下。。。
 

 

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