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Validating input java

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Input validation is performed to ensure only properly formed data is entering the workflow in an information system, preventing malformed data from persisting in the database and triggering malfunction of various downstream components.Input validation should happen as early as possible in the data flow, preferably as soon as the data is received from the external party.It is always recommended to prevent attacks as early as possible in the processing of the user’s (attacker's) request.Input validation can be used to detect unauthorized input before it is processed by the application.This message will repeat itself each time the loop requests for the input.

the Android application, although the Server does implement all the validations.

From a broader view, you’ll write no less than 1700 lines of code just for your validations and all that is repetitive.

The second solution that I came up with was to find out a way to make the fields required by some means, and check at runtime if the required fields have been initialised or not.

In essence I like going one step further than what each particular lesson is trying to teach.

I am currently writing a basic Calculator that can add, subtract, multiply and divide two numbers and have that core element working correctly.