Java Inter-Field Validation

Java Applets provide a powerful technique for validating inter-field dependencies. You have access to and control over all AWT components from your Java code so you can basically implement any checks that are required. The difficulty is in creating re-useable Applets that can be used to solve many problems.

The Advantages and Disadvantages for JAVA single field validation pertain here as well. There are also these additional comments:

ADVANTAGES:

Program control of all AWT components within the Applet.
Ability to communicate between Applets on the same page. Applets on a page run in the same Java virtual machine.
Applets are cached by the Browser and do not need to be reloaded each time they are used.
The same Applet can be re-used on the same page with different input parameters.

DISADVANTAGES:

Difficult to build general purpose Applets.
Version control issues between JDK 1.1.x development and 1.0.x support by most Browsers.
JDK 1.1.x contains many new features to help with control of the AWT components. However, using them and then running in a 1.0.x browser could be disastrous since the checks will not be enforced.

The examples provided below demonstrate inter-dependent fields:

Example 1	Demos of related Choice and TextFields (3 examples).
Example 2	Demo of Choice and Checkboxes
Example 3	Requires Java 1.1.3 support.

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