JList和ArrayList的更新 [英] JList and ArrayList update

问题描述

我想有例子就如何当我从一个ArrayList中添加或删除元素更新一个JList，

I would like to have example on how to update a JList when I add or remove elements from a ArrayList.

在ArrayList是模型类的一部分。模型类传递给视图（这是包含几个Swing组件一个JPanel，而我想更新JList中），通过它的构造。模型类也注入在一类读取从服务器接收到的值。当我从服务器接收到的数据我想补充一些人对我的ArrayList做model.getArrayList（）。添加（数据）。当我添加数据到ArrayList我想在我看来，以更新的JList。我想就如何我的ArrayList与我联系JList的帮助。

The ArrayList is part of Model class. The Model class is passed to the view (which is a JPanel containing several swing components, and the JList I want to update) via its constructor. The model class is also injected in a class that reads values received from the server. When i received data from the server I add some of them to my arrayList by doing model.getArrayList().add(data). When I add data to the arrayList i would like to update the JList in my view. I would like to have help on how to link my ArrayList with my JList.

推荐答案

如果您创建自己的 ListModel的你应该继承的 的AbstractListModel 并实施当你的的addElement 方法，你需要调用一个火 -method（通知用于更新的用户界面），如：

If you create your own ListModel you should extend AbstractListModel and when implementing your addElement method, you need to call a fire-method (for notifying the user interface for the update), like:

public void addElement(MyObject obj) {
    myArrayList.add(obj);
    fireIntervalAdded(this, myArrayList.size()-1, myArrayList.size()-1);
}

您的自定义ListModel的应该是这个样子：

You custom ListModel should look something like this:

public class MyListModel extends AbstractListModel {

    private final ArrayList<MyObject> myArrayList = new ArrayList<MyObject>();

    public void addElement(MyObject obj) {
        myArrayList.add(obj);
        fireIntervalAdded(this, myArrayList.size()-1, myArrayList.size()-1);
    }

    @Override
    public Object getElementAt(int index) { return myArrayList.get(index); }

    @Override
    public int getSize() { return myArrayList.size(); }
}

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