怎么根据JSplitPane左边的内容，比如JTree,在右边动态显示不同的JPanel

Question

怎么根据JSplitPane左边的内容，比如JTree,在右边动态显示不同的JPanel,JPanel包含JLabel 和JTextField.
我用JSplitPane splitPane=new JSplitPane(JSplitPane.
HORIZONTAL_SPLIT,tree,rightpanel);
rightpanel,怎么根据需要动态的改变成panel1,panel2,panel3?

Answer 1

import java.awt.BorderLayout;
import java.util.HashMap;
import java.util.Map;import javax.swing.*;
import javax.swing.event.TreeSelectionEvent;
import javax.swing.event.TreeSelectionListener;
import javax.swing.tree.TreePath;public class DynamicUITest {
    public static void main(String[] args) {
        JTree tree = new JTree();
        JScrollPane sp = new JScrollPane(tree);
        
        final JPanel rightPanel = new JPanel(new BorderLayout());
        JSplitPane splitPane = new JSplitPane(
                JSplitPane.HORIZONTAL_SPLIT, sp, rightPanel);
        splitPane.setDividerLocation(150);
        
        final Map nodeCompMap = new HashMap();        
        tree.addTreeSelectionListener(new TreeSelectionListener() {
            public void valueChanged(TreeSelectionEvent e) {
                TreePath path = e.getPath();
                if (path != null) {
                    String nodeName = path.getLastPathComponent().toString();
                    JComponent comp = (JComponent) nodeCompMap.get(nodeName);
                    if (comp == null) {
                        comp = createComponent(nodeName);
                        nodeCompMap.put(nodeName, comp);
                    }
                    rightPanel.removeAll();
                    rightPanel.add(comp, BorderLayout.CENTER);
                    rightPanel.revalidate();
                    rightPanel.repaint();
                }
            }
        });
        
        JFrame f = new JFrame("DynamicUITest");
        f.getContentPane().add(splitPane, BorderLayout.CENTER);
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setSize(800, 600);
        f.setLocationRelativeTo(null);
        f.show();
    }
    
    private static JComponent createComponent(String nodeName) {
        JPanel p = new JPanel();
        p.add(new JLabel(nodeName));
        p.add(new JTextField(nodeName));
        return p;
    }}