JScrollPanel

Question

我将一个JList添加到JScrollPane里面，
如何才能做到不管JList里面有及行数据，显示的始终是最后一行就是如果显示不够，滚动条自动滚动到最后一行

Answer 1

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowEvent;import javax.swing.DefaultListModel;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextField;public class AutoScrollList extends JFrame
{
    private JScrollPane jScrollPane = new JScrollPane();
    private DefaultListModel listModel = new DefaultListModel();
    private JList list = new JList(listModel);
    private JPanel textPane = new JPanel();
    private JTextField jTextField = new JTextField();
    private JButton appendButton = new JButton("append");    public AutoScrollList()
    {
        getContentPane().setLayout(new BorderLayout());        jScrollPane.getViewport().add(list, null);        appendButton.addActionListener(new ActionListener()
        {
            public void actionPerformed(ActionEvent e)
            {
                String text = jTextField.getText().trim();
                if (text.length() != 0)
                {
                    listModel.addElement(text);
                    //滚动封闭视口中的列表，使指定单元可见
                    list.ensureIndexIsVisible(listModel.getSize() - 1);
                }
            }
        });        textPane.setLayout(new BorderLayout());        textPane.add(jTextField, BorderLayout.CENTER);
        textPane.add(appendButton, BorderLayout.EAST);        getContentPane().add(jScrollPane, BorderLayout.CENTER);
        getContentPane().add(textPane, BorderLayout.SOUTH);
    }    protected void processWindowEvent(WindowEvent e)
    {
        super.processWindowEvent(e);
        if (e.getID() == WindowEvent.WINDOW_CLOSING)
        {
            System.exit(0);
        }
    }    public static void main(String[] args)
    {
        AutoScrollList frame = new AutoScrollList();
        frame.setSize(800, 500);
        frame.setLocation(100, 100);
        frame.setVisible(true);
    }
}