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Editorial Team
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Asked: 2026-06-03T02:15:23+00:00

I am creating a Swing GUI, I am using a series of JTextField .

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I am creating a Swing GUI, I am using a series of JTextField. I want to be able to add a custom property to the text field. This is going to be used to complete a calculation when focus is lost, for instance.

JTextField1.getCustomePram() * user input

I want a text field that will have a predefined value, it is for multiplying £20 * 5. So the default param will be 20 and the user will put the qty in, and on loss of focus the calculation will be done.

I am using Netbeans to build the GUI, I have tried extending the JTextField but to be honest I am not sure what to do, any advice or if I am going about this completely wrong please let me know.

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  1. Editorial Team

    I want a text field that will have a predefined value, it is for multiplying £20 * 5. So the default param will be 20 and the user will put the qty in, and on loss of focus the calculation will be done. .. if I am going about this completely wrong please let me know.

    You’re doing this completely wrong.

    For this I might use either a disabled text field or label for the unit price (£20), and a JSpinner for the quantity (5). Instead of doing the calculation on focus lost, add a change listener and show the user the new sub-total (and total if relevant) of the ordered item(s) in ‘real time’ – when the quantity is changed.

    Need to look at how I need to implement ideas in Java.

    A good place to look is the Visual Guide to Swing Components. Combine them in a layout for complex groups of components.

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