Validating number in java

Posted by / 10-Nov-2019 07:59

Validating number in java

This package provides the necessary classes for using Regular Expressions in a java application.It consists of following three main classes, The regex package has several other features for appending, text replacement, and greedy/non-greedy pattern matching.

Using this package I created a utility class to validate some commonly used data elements.The purpose of this code is to produce a consistent method to validate user input, and not let the program proceed until the user has inputted a correct type.The class methods accept user input as string, attempt to convert that input to the expected type.expects an integer, next Double expects a double, next Float expects a float and next Line expects a string.With the exception of strings, if a user inputs the wrong type, the code will produce an exception and (if not handled correctly) will stop.

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First, we set up a method to test whether or not the accepted input can be converted to a specific type: The loop is called with a string parameter that decides which message the user will see.