Check given String is a valid number in Java

In this video, I have explained how to check given String is valid number or not.
(Check number is valid Phone Number or Credit Card Number)

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[kadalivaraprasad]

Hello Naveen,
Can you do a video with exceptions
Most of the interviews they asking how do you handle exceptions using try catch, multiple catch blocks, finally, throw, throws, throwable using these create a video with each exception, for example null pointer exception and video to resolve, element not visible excpetion create all exception how much you can cover in one video that would be very useful and great help

[balachandar]

Bro how to add external jar library on JDK....not eclipse ide... I'm using sublime, notepad and cmd, I'm not using ide how to add external jar to Jdk 📁 folder bro...which folder I should add

[atharsalmanhussain]

Can't we just use reg expression method as it's validating both number and length as reg expression method passed into if condition where it's validating length of input separately along with it's valid number

[ghummakad_premi]

For some reason, pasting a GIthub link in the comments in not allowed or something - it is automatically deleting the comment.

[jonastad]

So based on ur logic would be a valid phone