java将数组刷新到jList中 [英] java refreshing an array into jList

问题描述

好的，所以我有一个 JList 并且内容提供了一个数组.我知道如何向数组添加元素，但我想知道如何刷新 JList ......或者甚至可能吗?我试过谷歌.:\

OK so I have a JList and the content is provided with an array. I know how to add elements to an array but I want to know how to refresh a JList... or is it even possible? I tried Google. :\

import java.applet.Applet;
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;


public class bs extends JApplet implements MouseListener {

public static String newline;
public static JList list;

    public void init() {



             String[] data = {"one", "two", "three", "four"};
              list = new JList(data);



        this.getContentPane().add(list);

        list.addMouseListener(this);

        String newline = "\n";

        list.setVisible(true);

    }

    public void refresh(){
        Address found;
        this.listModel.clear();

        int numItems = this.getAddressBookSize();
        String[] a = new String[numItems];
        for (int i=0;i<numItems;i++){
            found = (Address)Addresses.get(i);
            a[i] = found.getName();
        }
        /* attempt to sort the array */
        Arrays.sort(a, String.CASE_INSENSITIVE_ORDER);
        for (int i=0;i<numItems;i++) {
            this.listModel.addElement(a[i]);
        }
    }



    public void mousePressed(MouseEvent e) { }

    public void mouseReleased(MouseEvent e) {
        Object index = list.getSelectedValue();
       System.out.println("You clicked on: " + index);
    }

    public void mouseEntered(MouseEvent e) { }

    public void mouseExited(MouseEvent e) { }

    public void mouseClicked(MouseEvent e) { }




    public void paint(Graphics g) {

    }
}

有什么想法吗?

谢谢.

推荐答案

一个好的方法是创建一个 ListModel 来为您管理数据并处理更新.

One good approach is to create a ListModel to manage the data for you and handle updates.

类似于:

DefaultListModel listModel=new DefaultListModel();
for (int i=0; i<data.length; i++) {
  listModel.addElement(data[i]);
}
list=new JList(listModel);

然后您可以简单地通过列表模型进行更改，例如

Then you can simply make changes via the list model e.g.

listModel.addElement("New item");
listModel.removeElementAt(1); // remove the element at position 1

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