How to Use Tool Tips

Creating a tool tip for any JComponent object is easy. Use the setToolTipText method to set up a tool tip for the component. For example, to add tool tips to three buttons, you add only three lines of code:

b1.setToolTipText("Click this button to disable the middle button.");

b2.setToolTipText("This middle button does not react when you click it.");

b3.setToolTipText("Click this button to enable the middle button.");

When the user of the program pauses with the cursor over any of the program's buttons, the tool tip for the button comes up.

Running Codes

http://docs.oracle.com/javase/tutorial/uiswing/components/tooltip.html