克隆一个基类的列表

Question

我有一个基类称为AddressType

我也有两个子类叫HouseholdAddressType，PersonalAddressType。 （所以这两个扩展的AddressType）

我绕过地址类型的列表：

List<AddressType> addresses 

许多方法，以及预制棒不同的任务，因此，我想在我瓶坯这些任务可以克隆该列表。 。

我尝试这样的：

List<AddressType> copyOfAddress = new ArrayList<AddressType>(addresses.size()); 
    for (AddressType addressType: addresses) { 
     copyOfAddress.add((AddressType)addressType.clone());   
    } 

但它不工作，指出： “克隆已访问保护”

我该如何克隆这个列表？ 例子我的同班同学的名字将是一件好事..谢谢这么多

Answer 1

类AddressType必须实现Cloneable接口，

import java.util.ArrayList; 
import java.util.List; 


public class Foo { 
    public static void main(String[] args) { 

     List<Person> oldList = new ArrayList<Person>(1); 
     oldList.add(new Person("Harry", "Potter")); 

     List<Person> newList = new ArrayList<Person>(); 
     for(Person person : oldList) 
     { 
      newList.add(person.clone()); // Deep copy of each person too. 
     } 

     Person person = newList.get(0); 
     person.setFirstName("James"); 

     System.out.println("Old list = " + oldList); 
     System.out.println("New list = " + newList); 
    } 

    static class Person implements Cloneable 
    { 
     private String firstName; 
     private String lastName; 

     Person(String firstName, String lastName) 
     { 
      this.firstName = firstName; 
      this.lastName = lastName; 
     } 

     private Person(Person person) 
     { 
      this.firstName = person.firstName; 
      this.lastName = person.lastName; 
     } 

     public void setFirstName(String firstName) 
     { 
      this.firstName = firstName; 
     } 

     public String getFirstName() 
     { 
      return firstName; 
     } 

     public void setLastName(String lastName) 
     { 
      this.lastName = lastName; 
     } 

     public String getLastName() 
     { 
      return lastName; 
     } 

     @Override 
     public String toString() 
     { 
      StringBuilder sb = new StringBuilder(); 

      sb.append(firstName); 
      sb.append(" "); 
      sb.append(lastName); 

      return sb.toString(); 
     } 

     @Override 
     public Person clone() 
     { 
      return new Person(this); 
     } 
    } 
} 

输出

Old list = [Harry Potter] 
New list = [James Potter]