情况是我有两棵同样的树，我想在jTree1选择时同步选择jTree2的同样的结点。

所以我在jTree1的valueChange方法中处理，

    TreePath tp = jTree1.getSelectionPath();
    jTree2.setSelectionPath(tp);
    jTree2.makeVisible(tp);

但是jTree2似乎一点变化也没有，如何做？请高手指点一下吧。

其实jTree2已选中了相应的结点，我在jTree2的选中事件中如果输出它当前被选中的结点，的确是与jTree1选中的一样。说明jTree2被改变了，但是界面上不会有变化，为什么？

我试过 expandSelectedPath,invalidate,等等方法,都没用。

try it

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.tree.*;
import javax.swing.event.*;

public class Learn extends JFrame {

    JTree tree1 = new JTree();
    JTree tree2 = new JTree();

    public Learn(){


        tree1.addTreeExpansionListener(new TreeExpansionAction1());
        tree2.addTreeExpansionListener(new TreeExpansionAction2());

        ScrollPane sPaneLeft = new ScrollPane();
        ScrollPane sPaneRight = new ScrollPane();
        this.getContentPane().add(sPaneLeft,BorderLayout.WEST);
        this.getContentPane().add(sPaneRight,BorderLayout.EAST);
        sPaneLeft.add(tree1);
        sPaneRight.add(tree2);
        this.pack();
        this.setVisible(true);
    }

    class TreeExpansionAction1 implements TreeExpansionListener{
        public void treeCollapsed(TreeExpansionEvent event) {
            TreePath path = event.getPath();
            System.out.println("tree 1 collapsed : " + path.toString());
        }

        public void treeExpanded(TreeExpansionEvent event) {
            TreePath path = event.getPath();
            System.out.println("tree 1 expanded : " + path.toString());
            int row = tree1.getRowForPath(path);
            tree2.expandRow(row);
        }
    }

    class TreeExpansionAction2 implements TreeExpansionListener{
        public void treeCollapsed(TreeExpansionEvent event) {
            TreePath path = event.getPath();
            System.out.println("tree 2 collapsed : " + path.toString());
        }

        public void treeExpanded(TreeExpansionEvent event) {
            TreePath path = event.getPath();
            System.out.println("tree 2 expanded : " + path.toString());
            int row = tree2.getRowForPath(path);
            tree1.expandRow(row);
        }
    }

    public static void main(String[] args) {
        new Learn();
    }
}

感谢gtlang78()的提示，如下代码实现了利用model和treepath来完成同步的动作
注意构造函数的第一行，将两个tree的model设为相同，以后就很方便的实现了两棵树的同步。
我觉得这种方法才真正解决了sharetop(天生不笨)的问题，建议给gtlang78()加分

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.tree.*;
import javax.swing.event.*;

public class Tree extends JFrame {

    JTree tree1 = new JTree();
    JTree tree2 = new JTree();

    public Tree(){
        tree2.setModel(tree1.getModel());

        tree1.addTreeExpansionListener(new TreeExpansionAction1());
        tree2.addTreeExpansionListener(new TreeExpansionAction2());

        ScrollPane sPaneLeft = new ScrollPane();
        ScrollPane sPaneRight = new ScrollPane();
        this.getContentPane().add(sPaneLeft,BorderLayout.WEST);
        this.getContentPane().add(sPaneRight,BorderLayout.EAST);
        sPaneLeft.add(tree1);
        sPaneRight.add(tree2);
        this.pack();
        this.setVisible(true);
    }

    class TreeExpansionAction1 implements TreeExpansionListener{
        public void treeCollapsed(TreeExpansionEvent event) {
            TreePath path = event.getPath();
            System.out.println("tree 1 collapsed : " + path.toString());
            tree2.collapsePath(path);
        }

        public void treeExpanded(TreeExpansionEvent event) {
            TreePath path = event.getPath();
            System.out.println("tree 1 expanded : " + path.toString());
            tree2.expandPath(path);
        }
    }

    class TreeExpansionAction2 implements TreeExpansionListener{
        public void treeCollapsed(TreeExpansionEvent event) {
            TreePath path = event.getPath();
            System.out.println("tree 2 collapsed : " + path.toString());
            tree1.collapsePath(path);
        }

        public void treeExpanded(TreeExpansionEvent event) {
            TreePath path = event.getPath();
            System.out.println("tree 2 expanded : " + path.toString());
            tree1.expandPath(path);
        }
    }

    public static void main(String[] args) {
        new Tree();
    }
}

可以让两棵树使用同一个选择模型,只需两行代码

TreeSelectionModel model = jTree1.getSelectionModel();
jTree2.setSelectionModel(model);

还有很多其他的Swing组件可以用类似的方法同步,例如JSlider,JProgressBar,JList等