Validate if given string is a number.

Question

compmanic · Accepted Answer

Soln is right. Just make sure with interviewer on what he is expecting. if double then use Double.parseDouble(string s) or float.ParseFloat(String s).

mihir · Answer

I think a good solution can be something like this:

String pattern = "[0-9,.]+";
return (number.matches(pattern));

Utkarsh Bhatnagar · Answer

public static boolean validate(String s)
	{
		try
		{
			int i = Integer.parseInt(s);
		}
		catch(NumberFormatException e)
		{
			return false;
		}
		return true;
	}

sathvik · Answer

above solution is wrong as it never said the number is an int, it can be flot, decimal, double or int.

onemore check · Answer

if we are going with regex
mihir is on the right track
make sure you put (\+|-) before [0-9]+ since - or + should be allowed also to allow decimal numbers follow this with (\.)?[0-9]+

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