Question

我有一个NotificationEvent实例。每当创建此实例时，我都会在队列中添加此实例。队列的名称应为NotificationQueue。

NotificationEvent的结构是这样的：

public class NotificationEvent {

    private String sender;
    private String receiver;
    private String message;

    /**
     * @return the sender
     */
    public String getSender() {
        return sender;
    }

    /**
     * @param sender the sender to set
     */
    public void setSender(String sender) {
        this.sender = sender;
    }

    /**
     * @return the receiver
     */
    public String getReceiver() {
        return receiver;
    }

    /**
     * @param receiver the receiver to set
     */
    public void setReceiver(String receiver) {
        this.receiver = receiver;
    }

    /**
     * @return the message
     */
    public String getMessage() {
        return message;
    }

    /**
     * @param message the message to set
     */
    public void setMessage(String message) {
        this.message = message;
    }

NotificationQueue的所需结构应该是什么？

Answer 1

我建议不要再重新发明轮子。已经在Java运行时库中的接口Queue定义了队列应具有的操作。这是brief tutorial for the Queue interface和Queue JavaDoc。好吧，这里还有一个example of using Queue implementations。

您可以像这样创建通知队列对象：

Queue<NotificationEvent> eventQueue = new LinkedList<NotificationEvent>;

或者，如果您坚持为队列拥有自己的类型：

public class extends LinkedList<NotificationEvent> {
    /**
     * Constructs an empty list.
     */
    public NotificationQueue() {
    }

    /**
     * Constructs a list containing the elements of the specified collection,
     * in the order they are returned by the
     * collection's iterator.
     * @param c the collection whose elements are to be placed into this list
     * @throws NullPointerException if the specified collection is null
     */
    public NotificationQueue(Collection<? extends NotificationEvent> c) {
        super(c);
    }
}

...

NotificationQueue eventQueue == new NotificationQueue();

注意：
LinkedList不是Queue接口的唯一可用实现，请参阅Java运行时库中已有的其他实现的Queue JavaDoc。当然，您也可以编写自己的Queue接口实现。

如何在javaBeans中实现Queue

1 个答案: