Wie vermeide ich das Auffüllen von Menüelementen nach dem Upgrade von Java 21 auf Java 25? ⇐ Java

[Anonymous]

Das Problem trat nach dem Upgrade von Java 21 auf 25 auf.
Mit Java 21 sahen meine Menüs so aus:


Mit Java 25 begann eine Leerzeile zu erscheinen:


Ich habe ein minimales tragbares Beispiel zur Reproduktion erstellt:

Code: Select all

import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.image.BufferedImage;

import javax.swing.AbstractAction;
import javax.swing.Action;
import javax.swing.ButtonGroup;
import javax.swing.ImageIcon;
import javax.swing.JCheckBoxMenuItem;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JRadioButtonMenuItem;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.WindowConstants;

public class IconMenuExample {

public static void main(String[] args) throws Exception {

// we set the Windows Look And Feel
UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");

SwingUtilities.invokeLater(() -> {

JFrame frame = new JFrame("Menu Icon Example");

JMenuBar menuBar = new JMenuBar();
JMenu fileMenu = new JMenu("File");

// we create sample actions using programmatic sixteen by sixteen ImageIcon instances
Action openAction = newAction(
"Open",
createColorIcon(Color.BLUE),
e -> System.out.println("Open")
);

Action saveAction = newAction(
"Save",
createColorIcon(Color.GREEN),
e -> System.out.println("Save")
);

Action exitAction = newAction(
"Exit",
createColorIcon(Color.RED),
e -> System.exit(0)
);

// we attach the actions to menu items
fileMenu.add(new JMenuItem(openAction));
fileMenu.add(new JMenuItem(saveAction));
fileMenu.addSeparator();
fileMenu.add(new JMenuItem(exitAction));

// we create the second menu with check box menu items
JMenu optionsMenu = new JMenu("Options");

JCheckBoxMenuItem checkOne = new JCheckBoxMenuItem("Enable Feature One");
checkOne.addActionListener(e -> System.out.println("Feature One toggled: " + checkOne.isSelected()));

JCheckBoxMenuItem checkTwo = new JCheckBoxMenuItem("Enable Feature Two");
checkTwo.addActionListener(e -> System.out.println("Feature Two toggled: " + checkTwo.isSelected()));

optionsMenu.add(checkOne);
optionsMenu.add(checkTwo);

// we create the third menu with radio button menu items
JMenu modeMenu = new JMenu("Mode");

JRadioButtonMenuItem modeA = new JRadioButtonMenuItem("Mode A");
JRadioButtonMenuItem modeB = new JRadioButtonMenuItem("Mode B");
JRadioButtonMenuItem modeC = new JRadioButtonMenuItem("Mode C");

ButtonGroup modeGroup = new ButtonGroup();
modeGroup.add(modeA);
modeGroup.add(modeB);
modeGroup.add(modeC);

modeA.setSelected(true);

modeA.addActionListener(e -> System.out.println("Mode A selected"));
modeB.addActionListener(e -> System.out.println("Mode B selected"));
modeC.addActionListener(e ->  System.out.println("Mode C selected"));

modeMenu.add(modeA);
modeMenu.add(modeB);
modeMenu.add(modeC);

// we add all menus to the bar
menuBar.add(fileMenu);
menuBar.add(optionsMenu);
menuBar.add(modeMenu);

frame.setJMenuBar(menuBar);

frame.setSize(300, 200);
frame.setLocationRelativeTo(null);
frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
frame.setVisible(true);
});
}

public static Action newAction(String name, ImageIcon icon, ActionListener listener) {
Action action = new AbstractAction(name) {
@Override
public void actionPerformed(ActionEvent e) {
listener.actionPerformed(e);
}
};
action.putValue(Action.SMALL_ICON, icon);
return action;
}

// we create a programmatic sixteen by sixteen ImageIcon filled with the given color
private static ImageIcon createColorIcon(Color color) {
int size = 16;
BufferedImage image = new BufferedImage(size, size, BufferedImage.TYPE_INT_ARGB);
Graphics2D g = image.createGraphics();
try {
g.setColor(color);
g.fillRect(0, 0, size, size);
} finally {
g.dispose();
}
return new ImageIcon(image);
}
}

Es handelt sich um einen reservierten Bereich für Kontrollkästchen und Optionsfelder, wie im 2. und 3. Menü dargestellt. Wenn es jedoch keine gibt, wäre es sinnvoll, diesen Rand nicht anzuzeigen.