我正在尝试从 java 官方网站启动并运行此代码，但我得到了
Exception in thread "AWT-EventQueue-0" java.lang.StackOverflowError
at sun.awt.Win32GraphicsConfig.getBounds(Native Method)
at sun.awt.Win32GraphicsConfig.getBounds(Unknown Source)
at java.awt.Window.init(Unknown Source)
at java.awt.Window.<init>(Unknown Source)
at java.awt.Frame.<init>(Unknown Source)
at javax.swing.JFrame.<init>(Unknown Source)
此外，在下一行中，该方法甚至不存在。我正在使用 getContentPane() 来代替。
JSplitPane top = splitPaneDemo.getSplitPane();
最佳答案
演示效果很好。这是您的修改不起作用:)
这确实有效:
/*
* Copyright (c) 1995, 2008, Oracle and/or its affiliates. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* - Neither the name of Oracle or the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
import java.awt.*;
import javax.swing.*;
import javax.swing.event.*;
public class SplitPaneDemo2 extends JFrame
implements ListSelectionListener {
private JLabel label;
public SplitPaneDemo2() {
super("SplitPaneDemo2");
//Create an instance of SplitPaneDemo
SplitPaneDemo splitPaneDemo = new SplitPaneDemo();
JSplitPane top = splitPaneDemo.getSplitPane();
splitPaneDemo.getImageList().addListSelectionListener(this);
//XXXX: Bug #4131528, borders on nested split panes accumulate.
//Workaround: Set the border on any split pane within
//another split pane to null. Components within nested split
//panes need to have their own border for this to work well.
top.setBorder(null);
//Create a regular old label
label = new JLabel("Click on an image name in the list.",
JLabel.CENTER);
//Create a split pane and put "top" (a split pane)
//and JLabel instance in it.
JSplitPane splitPane = new JSplitPane(JSplitPane.VERTICAL_SPLIT,
top, label);
splitPane.setOneTouchExpandable(true);
splitPane.setDividerLocation(180);
//Provide minimum sizes for the two components in the split pane
top.setMinimumSize(new Dimension(100, 50));
label.setMinimumSize(new Dimension(100, 30));
//Add the split pane to this frame
getContentPane().add(splitPane);
}
public void valueChanged(ListSelectionEvent e) {
if (e.getValueIsAdjusting())
return;
JList theList = (JList) e.getSource();
if (theList.isSelectionEmpty()) {
label.setText("Nothing selected.");
} else {
int index = theList.getSelectedIndex();
label.setText("Selected image number " + index);
}
}
/**
* Create the GUI and show it. For thread safety,
* this method should be invoked from the
* event-dispatching thread.
*/
private static void createAndShowGUI() {
//Create and set up the window.
JFrame frame = new SplitPaneDemo2();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Display the window.
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
//Schedule a job for the event-dispatching thread:
//creating and showing this application's GUI.
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
}
class SplitPaneDemo extends JPanel
implements ListSelectionListener {
private JLabel picture;
private JList list;
private JSplitPane splitPane;
private String[] imageNames = {"Bird", "Cat", "Dog", "Rabbit", "Pig", "dukeWaveRed",
"kathyCosmo", "lainesTongue", "left", "middle", "right", "stickerface"};
public SplitPaneDemo() {
//Create the list of images and put it in a scroll pane.
list = new JList(imageNames);
list.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
list.setSelectedIndex(0);
list.addListSelectionListener(this);
JScrollPane listScrollPane = new JScrollPane(list);
picture = new JLabel();
picture.setFont(picture.getFont().deriveFont(Font.ITALIC));
picture.setHorizontalAlignment(JLabel.CENTER);
JScrollPane pictureScrollPane = new JScrollPane(picture);
//Create a split pane with the two scroll panes in it.
splitPane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT,
listScrollPane, pictureScrollPane);
splitPane.setOneTouchExpandable(true);
splitPane.setDividerLocation(150);
//Provide minimum sizes for the two components in the split pane.
Dimension minimumSize = new Dimension(100, 50);
listScrollPane.setMinimumSize(minimumSize);
pictureScrollPane.setMinimumSize(minimumSize);
//Provide a preferred size for the split pane.
splitPane.setPreferredSize(new Dimension(400, 200));
updateLabel(imageNames[list.getSelectedIndex()]);
}
//Listens to the list
public void valueChanged(ListSelectionEvent e) {
JList list = (JList) e.getSource();
updateLabel(imageNames[list.getSelectedIndex()]);
}
//Renders the selected image
protected void updateLabel(String name) {
ImageIcon icon = createImageIcon("images/" + name + ".gif");
picture.setIcon(icon);
if (icon != null) {
picture.setText(null);
} else {
picture.setText("Image not found");
}
}
//Used by SplitPaneDemo2
public JList getImageList() {
return list;
}
public JSplitPane getSplitPane() {
return splitPane;
}
/**
* Returns an ImageIcon, or null if the path was invalid.
*/
protected static ImageIcon createImageIcon(String path) {
java.net.URL imgURL = SplitPaneDemo.class.getResource(path);
if (imgURL != null) {
return new ImageIcon(imgURL);
} else {
System.err.println("Couldn't find file: " + path);
return null;
}
}
/**
* Create the GUI and show it. For thread safety,
* this method should be invoked from the
* event-dispatching thread.
*/
private static void createAndShowGUI() {
//Create and set up the window.
JFrame frame = new JFrame("SplitPaneDemo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
SplitPaneDemo splitPaneDemo = new SplitPaneDemo();
frame.getContentPane().add(splitPaneDemo.getSplitPane());
//Display the window.
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
//Schedule a job for the event-dispatching thread:
//creating and showing this application's GUI.
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
}
您可以将其全部粘贴到名为 SplitPaneDemo2.java 的文件中，然后编译并运行它。
原始来源:
关于Java SplitPaneDemo 不起作用？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/5419555/