import javax.swing.*;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
/**
* 三级菜单
*
*/
public class JPopupMenu3 {
public static void main(String[] args) {
JFrame frame = new JFrame("Swing Right-Click Menu Example");
JTextArea textArea = new JTextArea("Right-click to show menu");
// 创建一级菜单
JPopupMenu popupMenu = new JPopupMenu();
JMenu editMenu = new JMenu("Edit");
JMenuItem cutItem = new JMenuItem("Cut");
JMenuItem copyItem = new JMenuItem("Copy");
JMenuItem pasteItem = new JMenuItem("Paste");
editMenu.add(cutItem);
editMenu.add(copyItem);
editMenu.add(pasteItem);
popupMenu.add(editMenu);
popupMenu.add(cutItem);
// 创建二级菜单
JMenu subMenu = new JMenu("Submenu");
JMenuItem item1 = new JMenuItem("Item 1");
JMenuItem item2 = new JMenuItem("Item 2");
subMenu.add(item1);
subMenu.add(item2);
editMenu.add(subMenu); // 将二级菜单添加到一级菜单
// 添加右键点击事件
textArea.addMouseListener(new MouseAdapter() {
@Override
public void mouseReleased(MouseEvent e) {
if (e.isPopupTrigger()) {
popupMenu.show(e.getComponent(), e.getX(), e.getY());
}
}
});
JScrollPane scrollPane = new JScrollPane(textArea);
frame.add(scrollPane);
frame.setSize(400, 300);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
}