[求助]错在哪啊ArrayList

import java.util.ArrayList;

class MailAddress
{
private String name;
private String street;
private String city;
private String country;
private long pinCode;

ArrayList store1 = new ArrayList();


MailAddress(String name1,String street1,String city1,String country1, long pinCode1)
{
name = name1;
street = street1;
city = city1;
country = country1;
pinCode = pinCode1;
}

public void store(MailAddress obj1,MailAddress obj2,MailAddress obj3)
{
store1.add(obj1);
store1.add(obj2);
store1.add(obj3);
}


public void show()
{

System.out.println("******************************************");
System.out.println("客户电子邮件地址");
System.out.println("*******************************************");
System.out.println();

System.out.println("[");


for(int i=0; i<store1.size(); i++)
{
System.out.println((chapter7p4)(store1.get(i)).name);
System.out.println((chapter7p4)(store1.get(i)).street);
System.out.println((chapter7p4)(store1.get(i)).city);
System.out.println((chapter7p4)(store1.get(i)).country);
System.out.println((chapter7p4)(store1.get(i)).pinCode);

if(store1.size() == i)
{
System.out.println(",");
}
}
System.out.println("]");
}
}

public class chapter7p4
{
public static void main(String args[])
{
MailAddress obj1 = new MailAddress("David Clarke","10 Downing","LondonState : London","United Kingdom",110022);
MailAddress obj2 = new MailAddress("John Lenon","12 Park Avenue","CaliforniaState : California","USA",210033);
MailAddress obj3 = new MailAddress("Stefii Graff","14 Maple Lane","MahomaState : Sydney","Australia",412033);

obj1.store(obj1,obj2,obj3);
obj1.show();
}
}

----------------解决方案--------------------------------------------------------
先看看chapter7p4类在什么地方
----------------解决方案--------------------------------------------------------
光帖代码是不好用的,最好是把错误的信息也帖出来
你的代码所在的文件是不是叫chapter7p4.java,如果不是,那这就错得不应该
----------------解决方案--------------------------------------------------------
是类型转换错误，谢谢水影~！
----------------解决方案--------------------------------------------------------