Question

I have a JMenu with a JMenuItem, and when I click on this, I need to open a JFrame or window, in other words a component with inside JButton, JTextField,…

How can i do this ?

Answer 1

You can create the JFrame in the same way you created your initial JFrame, and call

setVisible(true);

in the ActionListener of your JMenuItem to make it visible when the menu is clicked.

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If you want it to be modal (original frame cannot be accessed unless the new window is closed), you can use a JDialog instead, setting modal to true in the constructor, or calling setModal(true).