Check if inputTextField contains numbers only

Many times you want to check if the inputText contains numbers of decimals only e.g. getting amount in input.

public boolean isValidNumber(String inputNumber){

     Pattern p = Pattern.compile('\\d+(\\.\\d+)?');

     Matcher m =p.matcher(inputNumber);

     return m.Matches();

}

The above method return true if it is a valid number else return false.