[Solved] String is empty [closed]

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You are getting StringIndexOutOfBoundsException because first thing in your 

while (number.charAt(0) != '0' || number.length() < 4 || !number.matches("^[0-9]*") || number.isEmpty())

condition is number.charAt(0) which can throw exception if string is empty "". To get rid of this problem move number.isEmpty() before number.charAt(0) != '0'.

This is to validate a phone number that starts with 0, and has a minimum length of 4 numbers.

Try this way

while (!number.matches("0[0-9]{3,}"))

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solved String is empty [closed]