Input Validation for JoptionPane

A good programming practice is to take care of input validation while prompting and receiving input from the user.

An easy way to implement is using regex code expressions, but be aware some delimiters like /d are not valid to use in Java. You will get a runtime error.

For instance, if you have a string input you can use regex code: (“[a-zA-Z]+”)

By using the function; .matches, you can parse through the entered string and ensure the user only types alphabets. You can put this in a while loop and show user error if the input is incorrect and re-ask for another input.

Similarly, you can use regular expressions to check for integer only values or decimal values.

For any queries, ask #AyeshaAsghar


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