Java Swing - 如何從JComboBox中刪除箭頭按鈕
我們想知道如何從JComboBox中刪除箭頭按鈕。
import java.awt.Color;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.UIManager;
import javax.swing.plaf.basic.BasicComboBoxUI;
public final class Main {
public static void main(String[] args) {
String[] items = {"A", "B", "C"};
JComboBox<String> comboBox1 = new MyComboBox1<>(items);
JPanel p = new JPanel();
p.add(comboBox1);
JFrame f = new JFrame();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.getContentPane().add(p);
f.setSize(320, 240);
f.setVisible(true);
}
}
class MyComboBox1<E> extends JComboBox<E> {
public MyComboBox1(E[] list) {
super(list);
}
@Override public void updateUI() {
super.updateUI();
setUI(new BasicComboBoxUI() {
@Override protected JButton createArrowButton() {
return new JButton() {
@Override public int getWidth() {
return 0;
}
};
}
});
setBorder(BorderFactory.createLineBorder(Color.GRAY));
}
}
【jcombobox】
