java - 更新 Java Swing JList

Question

我使用 WindowBuilder Pro 生成了下面 GuiTest 类中的大部分代码，带有“////////”的行除外我添加(或更改)的权利。 WindowBuilder Pro(所见即所得)一直在向构造函数中添加代码 - 但还没有提示我进行了更改。我想继续以这种方式使用 WindowBuilder Pro 进行构建，所以我不想更改 GUI 的总体架构。

我还在下面进一步创建了一个 DataTest 类来模拟收集数据集的某个缓慢过程。

这是我的问题:我想要做的是用来自 DataTest 类的新数据更新 JList。

GuiTest 类:

import java.awt.BorderLayout;
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.ListSelectionModel;
import javax.swing.border.EmptyBorder;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener; ///////////
import javax.swing.JList;
import javax.swing.JLabel;

import discoverTool.DataTest;

public class GuiTest extends JFrame implements ListSelectionListener{
    private String[] foo =  {"thing1","thing2","thing3"}; //////////////

    private JPanel contentPane;
    private JLabel lblNewLabel; //////////////made global

    /**
     * Launch the application.
     * @throws InterruptedException 
     */
    public static void main(String[] args) throws InterruptedException {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    GuiTest frame = new GuiTest();
                    frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
        DataTest dt = new DataTest();/////////////
        GuiTest gt = new GuiTest();
        gt.foo = dt.foo;
        gt.updateJList(dt.foo);
    }

    public void updateJList(String[] f){
        //reset the list with f
    }

    /**
     * Create the frame.
     */
    public GuiTest() {
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setBounds(100, 100, 450, 300);
        contentPane = new JPanel();
        contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
        setContentPane(contentPane);
        contentPane.setLayout(null);

        JList list = new JList(foo);
        list.setSelectionMode(ListSelectionModel.SINGLE_SELECTION); /////////////
        list.setSelectedIndex(0);               //////////////
        list.addListSelectionListener(this);    //////////////      
        list.setBounds(10, 11, 134, 240);
        contentPane.add(list);

        JPanel panel = new JPanel();
        panel.setBounds(154, 11, 188, 81);
        contentPane.add(panel);
        panel.setLayout(null);

        //JLabel lblNewLabel = new JLabel("New label");/////////
        lblNewLabel = new JLabel("New label");///////////
        lblNewLabel.setBounds(10, 11, 46, 14);
        panel.add(lblNewLabel);
    }

    public void valueChanged(ListSelectionEvent e) {///////////////
        JList jList = (JList)e.getSource();////////////
        lblNewLabel.setText( foo[jList.getSelectedIndex()] );///////////
    }///////////
}

数据测试类:

public class DataTest {

    public String[] foo;

    public DataTest() throws InterruptedException{
        //simulate a long process getting data;
        Thread.sleep(7000);
        foo = new String[4];
        foo[0]="hey";
        foo[1]="hi";
        foo[2]="bye";
        foo[3]="adios";
    }
}

Answer 1

对于 JList 更新，您只需要使用模型即可。您在 Data... 的构造函数调用中添加所有值，最好编写任何自定义方法并将您的值传递给该方法，然后将值添加到 JList 模型中。可以找到模型示例Java JList model http://www.java2s.com/Tutorial/Java/0240__Swing/0750__JList-Model.htm