想要在menu上面做一個新增分頁的item,選新增後 會產生新的分頁
但是最後分頁都產生不了 想請教大家問題出在哪裡 感謝!!
public class gui_test extends JFrame {
private JMenuBar menuBar;
private JMenu Action;
private JMenuItem Add;
private JTextArea textarea;
public gui_test(){
makeMenu();
setVisible( true );
setResizable( true );
setSize(400, 200 );
addWindowListener( new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
}
private void makeMenu() {
menuBar = new JMenuBar();
Action = new JMenu("Action");
Add = new JMenuItem("Add");
menuBar.add( Action );
Action.add( Add );
setJMenuBar( menuBar);
}
public void actionPerformed( ActionEvent ae )
{
Object source = ae.getSource();
if( source == Add ) {
Addtab();
}
}
private void Addtab() {
JPanel panel = new JPanel();
panel.setBackground(Color.green);
JTabbedPane page = new JTabbedPane(JTabbedPane.TOP);
page.addTab("test",panel);
page.validate();
getContentPane().add(page);
}
public static void main(String[] args) {
new gui_test();
}
}
--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 114.38.28.244