NumberUtils

NumberUtils are a series of functions created to check whether a string can be converted to a number or not. We will look briefly into each one, but you will see how intuitive they are:

• isNatural(String string): returns true if the given String represents a natural (>= 0) integer;
• isInteger(String string): returns true if the given String represents an integer;
• isNaturalLong(String string): returns true if the given String represents a natural (>= 0) long;
• isLong(String string): returns true if the given String represents a long;
• isDouble(String string): returns true if the given String represents a double;
• isFloat(String string): returns true if the given String represents a float.