Why ask for something "sort of like a tool tip" when you can use just that, a tool tip? Simply set the JButton's tool tip text via the JComponent setToolTipText(...)
method (which JButton inherits) and you're there!
myButton.setToolTipText("Foo");
Question
I would like to find out how I can link a JLabel to a JButton, so that when ever the button is hovered over, a piece of text appears. Sort of like a tool tip, indicating what this button does before it's clicked.
Solution
Why ask for something "sort of like a tool tip" when you can use just that, a tool tip? Simply set the JButton's tool tip text via the JComponent setToolTipText(...)
method (which JButton inherits) and you're there!
myButton.setToolTipText("Foo");