Open Frame from MainFrame Menu item

Question

I created new Frame, and I want to open this frame from Main Frame menu item.
Help me

Answer 1

You should add an action listener to the Menu Item. In the action listener's actionPerformed(ActionEvent) method, call your frame's setVisible(boolean) method.
//frame setup
        JFrame mainFrame = new JFrame("main frame");
        final JFrame otherFrame = new JFrame("second frame");
        mainFrame.setSize(400,400);
        otherFrame.setSize(200,200);
        //menu setup
        JMenuItem item = new JMenuItem("Open my special frame");
        JMenuBar bar = new JMenuBar();
        JMenu menu = new JMenu("menu");
        bar.add(menu);
        menu.add(item);
        mainFrame.setJMenuBar( bar );
        mainFrame.setVisible( true );
        //here's the important part
        item.addActionListener( new ActionListener()
            @Override
            public void actionPerformed(ActionEvent e)
               otherFrame.setVisible(true);
    }