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单击按钮以在 JTree 中设置选择路径后，我一直在尝试。该代码正确设置了路径，但是每次单击它时，我都会得到一个

Exception in thread "AWT-EventQueue-0" java.util.ConcurrentModificationException
at java.util.AbstractList$Itr.checkForComodification(Unknown Source)
at java.util.AbstractList$Itr.next(Unknown Source)
at com.treeview.main.iui.SelectableTree.actionPerformed(SelectableTree.java:225)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$000(Unknown Source)
at java.awt.EventQueue$1.run(Unknown Source)
at java.awt.EventQueue$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue$2.run(Unknown Source)
at java.awt.EventQueue$2.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)

我不知道是什么原因造成的。我读到当您多个线程尝试访问同一资源但我看不到问题时会发生这种情况。

这是我要运行的代码：

/**
     * Handles the event when a button is clicked.
     */
    @Override
    public void actionPerformed(ActionEvent arg0) {
            // If button "Force adaptation is clicked"
            if (arg0.getSource() == forceAdapt) {
                    // ModelContainer.getInstance().getAdaptedTree().removeAllChildren();
                    // tree.setModel(new DefaultTreeModel(ModelContainer.getInstance()
                    // .getAdaptedTree()));
                    // treeModel.reload();
            } else if (arg0.getSource() == showAll) {
                    expandFullTree(tree, ModelContainer.getInstance().getAdaptedTree());
                    // If button "Show All" is clicked
                    // tree.setModel(new DefaultTreeModel(ModelContainer.getInstance()
                    // .getFullTree()));
                    // treeModel.reload();
            }
            // In case recommendation button was clicked.

            for (JButton button : recommendButtons) {
                    if (arg0.getSource() == button) {
                            TreeHandler th = new TreeHandler();
                            TreeItem node = th.getNodeByName(ModelContainer.getInstance()
                                            .getAdaptedTree(), button.getText());

                            tree.setSelectionPath(new TreePath(node.getPath()));
                    }
            }

    }

这两种方法用按钮填充 ArrayList：

 /**
 * Handles tree selection event.
 */
public void valueChanged(TreeSelectionEvent event) {
    selectedNode = (TreeItem) tree.getLastSelectedPathComponent();

    // If there's predecessors.
    if (!lastSelectedNode.getId().equals("-1")) {
        // Display selection in bottom bar.
        currentSelectionField.setText("Current Selection: "
                + selectedNode.toString() + " Prev Node : "
                + lastSelectedNode.toString());
        /*
         * Increase the clicks in the transition matrix and updates the
         * probability transition matrix.
         */
        ModelContainer.getInstance().increaseClicksOnElement(
                Integer.parseInt(selectedNode.getId()) - 1,
                Integer.parseInt(lastSelectedNode.getId()) - 1);
        // Recalculate the Markovian matrix.
        ModelContainer.getInstance().recalculateMarkovian();

        // Display recommendations
        displayRecommendations(ModelContainer.getInstance()
                .getNextMarkovians(
                        (Integer.parseInt(selectedNode.getId()) - 1) + "",
                        5));

    }

    lastSelectedNode = selectedNode;

}

public void displayRecommendations(ArrayList<TreeItem> recommend) {

    recommendation.removeAll();

    int place = 2;
    for (TreeItem treeItem : recommend) {
        JButton aButton = new JButton(treeItem.toString());
        aButton.setPreferredSize(new Dimension(recommendation.getWidth(),
                recommendation.getHeight() / place));
        aButton.addActionListener(this);
        recommendButtons.add(aButton);
        recommendation.add(aButton);
        System.out.println(aButton.getText());
        place = place * 2;
    }
    recommendation.revalidate();
    recommendation.repaint();

}
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