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I have a gpa program, and it works with the equalsIgnoreCase() method which compares two strings, the letter "a" to the user input, which checks if they put "a" or not. But now I want to add an exception with an error message that executes when a number is the input. I want the program to realize that the integer input is not the same as string and give an error message. Which methods can I use to compare a type String variable to input of type int, and throw exception?
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If we want to know whether a given string has repeated characters, the simplest way is to use the existing method of finding first occurrence from the end of the string, e.g. lastIndexOf in java. In Python, the equivalence would be rfind method of string type that will look for the last occurrence of the substring.
Return true if all characters in the string are digits and there is at least one character, false otherwise. For unicode strings or Python 3 strings, you'll need to use a more precise definition and use the unicode. isdecimal() / str. isdecimal() instead; not all Unicode digits are interpretable as decimal numbers.
Many options explored at http://www.coderanch.com/t/405258/java/java/String-IsNumeric
One more is
public boolean isNumeric(String s) { return s != null && s.matches("[-+]?\\d*\\.?\\d+"); } Might be overkill but Apache Commons NumberUtils seems to have some helpers as well.
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