使用setModel（）更新JComboBox时是否存在java.lang.IllegalStateException？ [英] java.lang.IllegalStateException when updating JComboBox with setModel()?

问题描述

我试图用setModel（）更新JComboBox。但是，它会抛出java.lang.IllegalStateException。
具体来说，我使用JTextField指向JComboBox的可编辑组件，并在每次JTextField收到新输入时更新JComboBox。

I was trying to updating JComboBox with setModel(). However, it throws a java.lang.IllegalStateException. Specifically, I used a JTextField to point to the Editable component of the JComboBox, and Update the JComboBox every time the JTextField recieves a new input.

任何人都可以告诉我原因？

Can anyone tell me the reason?

package ui;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;

import javax.swing.DefaultComboBoxModel;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.JToolBar;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;

public class TestFrame extends JFrame implements DocumentListener {

    private static final long serialVersionUID = 1L;

    // tool bar
    private JToolBar topToolBar;
    private JTextField wordSearchField;
    private JComboBox<String> wordSearchTips;

    // window size
    private static final int width = 700;
    private static final int height = 500;

    public TestFrame() {
    }

    public static void main(String[] argv) {
        new TestFrame().CreateUI();
    }

    public void CreateUI() {
        setPreferredSize(new Dimension(width, height));
        setResizable(false);
        setLayout(new BorderLayout());

        // bottom
        JPanel bottom = new JPanel();
        bottom.setPreferredSize(new Dimension(width, 480));
        bottom.setLayout(new BorderLayout());

        // top
        topToolBar = new JToolBar();
        topToolBar.setBackground(Color.WHITE);
        topToolBar.setPreferredSize(new Dimension(width, 30));

        wordSearchTips = new JComboBox<String>();
        wordSearchTips.setEditable(true);
        wordSearchTips.setSelectedIndex(-1);
        wordSearchField = (JTextField) wordSearchTips.getEditor()
                .getEditorComponent();
        wordSearchField.getDocument().addDocumentListener(this);

        topToolBar.add(wordSearchTips);

        add(topToolBar, BorderLayout.NORTH);
        add(bottom, BorderLayout.SOUTH);

        pack();
        setVisible(true);

    }

    @Override
    public void changedUpdate(DocumentEvent e) {

    }

    @Override
    public void insertUpdate(DocumentEvent e) {

        String keyword = wordSearchField.getText().trim();
        DefaultComboBoxModel<String> m = new DefaultComboBoxModel<String>();
        ;
        for (int i = 0; i < 10; i++) {
            m.addElement(i + "");
        }
        wordSearchTips.setModel(m);
        wordSearchTips.setSelectedIndex(-1);
        ((JTextField) wordSearchTips.getEditor().getEditorComponent())
                .setText(keyword);
        wordSearchTips.showPopup();
    }

    @Override
    public void removeUpdate(DocumentEvent e) {
    }
}

以下是例外：

Exception in thread "AWT-EventQueue-0" java.lang.IllegalStateException: Attempt to mutate in notification
    at javax.swing.text.AbstractDocument.writeLock(Unknown Source)
    at javax.swing.text.AbstractDocument.replace(Unknown Source)
    at javax.swing.text.JTextComponent.setText(Unknown Source)
    at javax.swing.plaf.metal.MetalComboBoxEditor$1.setText(Unknown Source)
    at javax.swing.plaf.basic.BasicComboBoxEditor.setItem(Unknown Source)
    at javax.swing.JComboBox.configureEditor(Unknown Source)
    at javax.swing.plaf.basic.BasicComboBoxUI$Handler.propertyChange(Unknown Source)
    at javax.swing.plaf.basic.BasicComboBoxUI$PropertyChangeHandler.propertyChange(Unknown Source)
    at javax.swing.plaf.metal.MetalComboBoxUI$MetalPropertyChangeListener.propertyChange(Unknown Source)
    at java.beans.PropertyChangeSupport.fire(Unknown Source)
    at java.beans.PropertyChangeSupport.firePropertyChange(Unknown Source)
    at java.beans.PropertyChangeSupport.firePropertyChange(Unknown Source)
    at java.awt.Component.firePropertyChange(Unknown Source)
    at javax.swing.JComboBox.setModel(Unknown Source)
    at ui.TestFrame.insertUpdate(TestFrame.java:94)
    at javax.swing.text.AbstractDocument.fireInsertUpdate(Unknown Source)
    at javax.swing.text.AbstractDocument.handleInsertString(Unknown Source)
    at javax.swing.text.AbstractDocument.insertString(Unknown Source)
    at javax.swing.text.PlainDocument.insertString(Unknown Source)
    at javax.swing.text.AbstractDocument.replace(Unknown Source)
    at javax.swing.text.JTextComponent.replaceSelection(Unknown Source)
    at javax.swing.text.DefaultEditorKit$DefaultKeyTypedAction.actionPerformed(Unknown Source)
    at javax.swing.SwingUtilities.notifyAction(Unknown Source)
    at javax.swing.JComponent.processKeyBinding(Unknown Source)
    at javax.swing.JComponent.processKeyBindings(Unknown Source)
    at javax.swing.JComponent.processKeyEvent(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.KeyboardFocusManager.redispatchEvent(Unknown Source)
    at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(Unknown Source)
    at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(Unknown Source)
    at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(Unknown Source)
    at java.awt.DefaultKeyboardFocusManager.dispatchEvent(Unknown Source)
    at java.awt.Component.dispatchEventImpl(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$200(Unknown Source)
    at java.awt.EventQueue$3.run(Unknown Source)
    at java.awt.EventQueue$3.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
    at java.awt.EventQueue$4.run(Unknown Source)
    at java.awt.EventQueue$4.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$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)

推荐答案

从<包裹你的代码code> insertUpdate（DocumentEvent e） in SwingUtilities.invokeLater（）

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