JSpinner : Java Glossary

2008-07-01 by Roedy Green ©1996-2008 Canadian Mind Products
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JSpinner

To see a JSpinner in action, look at the Font Shower Amanuesis that uses one to let you control the font size. You can use the arrow keys to change the value, or you can type in a new value. Here is the basic code to make one work.

You can customise how the spinner values jump by writing your own SpinnerModel. You can customise how the display looks and how you can edit it by writing a custom JComponent and using JSpinner. setEditor. If you want to roll your own, it is wise to look at Sun’s implementations to understand just what these classes do. The source is in J:\Program Files\java\jdk1.6.0_06\src.zip. Here is a crude example of how you would spin a formatted value.

For a more real-world example see the source code for the Canadian Tax Calculator.

Tips

A JSpinner is actually three little JComponents, a JFormattedTextField, and up arrow button and a down arrow button. When methods don’t behave as you would expect when called on the JSpinner as a whole, try using JSpinner.getTextField and doing your operations on that subcomponent, e.g. tabbing, event notification etc.

Learning More

Sun’s Javadoc on the JSpinner class : available:

on the web at java.Sun.com
in the JDK 1.6.0_06 or in JDK 1.5.0_15 on your local J: drive.

Sun’s Javadoc on the SpinnerModel class : available:

on the web at java.Sun.com
in the JDK 1.6.0_06 or in JDK 1.5.0_15 on your local J: drive.

Sun’s Javadoc on the AbstractSpinnerModel class : available:

on the web at java.Sun.com
in the JDK 1.6.0_06 or in JDK 1.5.0_15 on your local J: drive.

Sun’s Javadoc on the SpinnerDateModel class : available:

on the web at java.Sun.com
in the JDK 1.6.0_06 or in JDK 1.5.0_15 on your local J: drive.

Sun’s Javadoc on JSpinner.DateEditor : available:

on the web at java.Sun.com
in the JDK 1.6.0_06 or in JDK 1.5.0_15 on your local J: drive.

Sun’s Javadoc on the SpinnerListModel class : available:

on the web at java.Sun.com
in the JDK 1.6.0_06 or in JDK 1.5.0_15 on your local J: drive.

Sun’s Javadoc on JSpinner.ListEditor : available:

on the web at java.Sun.com
in the JDK 1.6.0_06 or in JDK 1.5.0_15 on your local J: drive.

Sun’s Javadoc on the SpinnerNumberModel class : available:

on the web at java.Sun.com
in the JDK 1.6.0_06 or in JDK 1.5.0_15 on your local J: drive.

Sun’s Javadoc on JSpinner.NumberEditor : available:

on the web at java.Sun.com
in the JDK 1.6.0_06 or in JDK 1.5.0_15 on your local J: drive.

JComboBox
JSlider
Swing

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