import java.awt.Component;
import java.awt.ComponentOrientation;
import java.awt.Container;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JMenu;
public class Main extends JFrame {
public Main() {
JComboBox itemsComboBox = new JComboBox(new String[]{ "A", "L", "M" });
itemsComboBox.setEditable(true);
itemsComboBox.setMaximumRowCount(3);
this.getContentPane().add(itemsComboBox);
itemsComboBox.setVisible(true);
applyOrientation(this, ComponentOrientation.RIGHT_TO_LEFT);
this.validate();
this.repaint();
}
public static void main(String[] args) {
JFrame frame = new Main();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.setVisible(true);
}
private void applyOrientation(Component c, ComponentOrientation o) {
c.setComponentOrientation(o);
if (c instanceof JMenu) {
JMenu menu = (JMenu) c;
int ncomponents = menu.getMenuComponentCount();
for (int i = 0; i < ncomponents; ++i) {
applyOrientation(menu.getMenuComponent(i), o);
}
} else if (c instanceof Container) {
Container container = (Container) c;
int ncomponents = container.getComponentCount();
for (int i = 0; i < ncomponents; ++i) {
applyOrientation(container.getComponent(i), o);
}
}
}
}
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