[英]how to implement Serializable on a class that is implementing Iterable
我一直在嘗試序列化此可迭代的Java類,以進行后續部署。 在下面的類中包含Serializable標簽會導致Java錯誤。 該代碼是通用的多集(bag)實現,該實現使用鏈接列表數據結構並實現迭代器實用程序,以便在多集內輕松進行通用項迭代。 任何人都可以撒些編碼小精靈粉並節省情況嗎? 幫助Java Bean制作典型的文檔!!
/**my iterable class **
**/
public class Bagged<Item> implements Iterable<Item> {
private int n;
private Node first;
//create empty bag
public Bagged(){ first= null; n= 0; }
//check if bag is empty
public boolean empty(){return first==null;}
//add item
public void add(Item item){
Node theold = first;
first = new Node();
first.item= item;
first.nextnode = theold;
n++;
}
//return the number of items
public int size(){return n;}
//create linked list class as a helper
private class Node{private Item item; private Node nextnode; }
//returns an iterator that iterates over all items in thine bag
public Iterator<Item> iterator(){
return new ListIterator();
}
//iterator class--> remove() function ommited typical of a bag implementation.
private class ListIterator implements Iterator<Item>
{
private Node current = first;
public void remove(){ throw new UnsupportedOperationException();}
public boolean hasNext(){return current!=null;}
public Item next()
{
if(!hasNext())throw new NoSuchElementException();
Item item = current.item;
current = current.nextnode;
return item;
}
}
//main class omitted- end of iterable class.
}
發布確切的錯誤,但是如果您僅使Bagged Serializable可以很清楚地看到該錯誤:
public static void main(String[] args) throws IOException {
Bagged<Object> bag = new Bagged<Object>();
bag.add(new Object());
new ObjectOutputStream(new ByteArrayOutputStream()).writeObject(bag);
}
Exception in thread "main" java.io.NotSerializableException: Bagged$Node
ListIterator類不必是可序列化的,因為Bagged類不保存對其的引用。 請注意,如果包中的對象不可序列化,您還將收到此異常。 要執行此操作,您需要聲明Bagged,如下所示:
public class Bagged <Item extends Serializable> implements Iterable <Item>, Serializable
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