Updating the Window

I'm new to the GUI field and am having trouble understanding how to update the Container when a button is clicked. I do understand how to create a JPanel, JFrame, Container, and other components and how to use them with ActionListener. But the problem is for example when the user fills in his username and password, then clicks login, the code I have written to validate the information works correctly, but I don't know how to update the Container to show the desired JPanels after that.
I have read many tutorials on the repaint method, but to no help. I'm not even sure if that's the right method to call. Would a JPanel be considered a Graphics object? If someone could please help me understand the logic behind this, I would so greatfully appreciate it. And if you know of a good tutorial for an idiot, please share the wealth. Thanks again.

So lets say I have a JPanel called login, another JPanel called sales, and then a JFrame called userInterface. So the way I'm thinking is when the button in login is clicked it validates the data, then creates an instance of sales and passes sales to a method I have written in userInterface called updateWindow. Where in this method it should add sales to the correct BorderLayout and then call revalidate. Does this seem correct?

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<Email Edited By Host>

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• » νιנαｿѕαяα∂нι ѕαмανє∂αм ™ « •
●๋•کáŕádhí'ک díáŕý ツ
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My new 8th gen iPod nano is 'not recognized' by my computer. My computer runs on Windows 7, and I've installed and updated the latest versions of itunes etc, but still to no avail! I've tried different usb ports, troubleshooting...

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Updating the Window

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