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我真的必须自己实现深度克隆，还是有任何库方法来获得 JTree 或其 TreeModel 的深度克隆？

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3 回答 3

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正如@SteveKuo 所说，为什么需要克隆 a TreeModel？TreeModel可以在不同的实例之间共享JTree。

这是两个共享同一模型的 JTree 的示例演示。或者，您可以创建两次相同的TreeModel：

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTree;
import javax.swing.SwingUtilities;
import javax.swing.Timer;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;

public class Test2JTree {

    private void initUI() {
        final JFrame frame = new JFrame(Test2JTree.class.getSimpleName());
        final DefaultTreeModel model = getTreeModel();
        final JTree tree1 = new JTree(model);
        final JTree tree2 = new JTree(model);
        frame.add(new JScrollPane(tree1), BorderLayout.WEST);
        frame.add(new JScrollPane(tree2), BorderLayout.EAST);
        frame.pack();
        frame.setSize(frame.getWidth() + 50, frame.getHeight() + 140);
        frame.setVisible(true);
        Timer t = new Timer(2000, new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent e) {
                DefaultMutableTreeNode root = (DefaultMutableTreeNode) model.getRoot();
                root.add(new DefaultMutableTreeNode("A new node"));
                model.nodesWereInserted(root, new int[] { root.getChildCount() - 1 });
                tree1.expandRow(0);
                tree2.expandRow(0);
                frame.revalidate();
            }
        });
        t.start();
    }

    private DefaultTreeModel getTreeModel() {
        return new DefaultTreeModel(new DefaultMutableTreeNode("Root object"));
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {

            @Override
            public void run() {
                new Test2JTree().initUI();
            }
        });
    }
}
于 2012-10-30T22:05:33.907 回答
1 

public IndigoMutableTreeNode cloneNode(IndigoMutableTreeNode node){
		IndigoMutableTreeNode newNode = new IndigoMutableTreeNode(node.getUserObject());
        for(int iChildren=node.getChildCount(), i=0;i<iChildren; i++){
                newNode.add((IndigoMutableTreeNode)cloneNode((IndigoMutableTreeNode)node.getChildAt(i) ) );
        }
        return newNode;
    }

只需传递根节点并获得完整的不同根节点并将其传递给新树的新模型。

于 2018-01-03T11:35:15.653 回答
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为什么需要同时克隆JTree和TreeModel. JTree是视图，它显示支持所TreeModel代表的任何内容。如果要创建第二个相同的树，那么您将复制/克隆树模型，并创建一个JTree指向复制的TreeModel.

于 2012-10-30T15:35:42.007 回答