Testing for an integer in java

I was just wondering if there was a simple and easy way to test if a string(single char string) is a number.

Maybe some method I do not know about, or maybe something like

if (string[1].equals(\\#))

Any thoughts?

Integer.parseInt(String value);

But I don't want to parse the string. I just want to test it to see if it is an integer or not.

I could probably use exception handling to see if it will parse or not, but I was just wondering if there is an easier way.

>>3

In that case, just run a loop from the beginning to the end of the string, checking to see if each character is between '0' and '9' inclusive. If any don't match or the string is of zero length, it's not an integer. Otherwise it is.

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>>1
Check the docs on java.util.regex (the only useful part of the Java library, and still comes with a retarded interface), and use Perl-compatible regular expressions to check for:
/^\s*-?\d+\s*$/

For floating point numbers:
/^\s*-?(?:\.\d+|\d+)\s*$/

>>6
Aww shit, premature postaculation.

For floating point numbers:
/^\s*-?(?:\.\d+|\d+(?:\.\d*)?)(?:[Ee][+-]?\d+)\s*$/

>>7
Oops, forced exponentiation of floating point numbers, thread over.

For floating point numbers, fixed:
/^\s*-?(?:\.\d+|\d+(?:\.\d*)?)(?:[Ee][+-]?\d+)?\s*$/

>>1
LOOOOOL jaaaavaaaaaaaaaaaa hahahhaaha

public class IsStringAnInteger {

    private static IsStringAnInteger instance;

    public IsStringAnInteger getInstance() {
        if (instance == null) {
            instance = new IsStringAnInteger();
        }
        return instance;
    }[code]public class IsStringANumber {

    private static IsStringANumber instance;

    public IsStringANumber getInstance() {
        if (in

    public bool isStringAnInteger(String isThisStringAnInteger) {
        boolean stringIsAnInteger = false;
        int min = getMinimumInteger();
        int max = getMaximumInteger();
        for (int val = min; val <= max; val++) {
            Integer integer = new Integer(val);
            String stringWhichIsAnInteger = integer.toString();
            if (isThisStringAnInteger.equals(stringWhichIsAnInteger)) {
                stringIsAnInteger = true;
            }
        }
        return stringIsAnInteger;
    }

    private int getMinimumInteger() {
        return Integer.MIN_VALUE;
    }

    private int getMaximumInteger() {
        return Integer.MAX_VALUE;
    }

}

I KNOW BECAUSE I AM AN EXPERT JAVA PROGRAMMER

C:

main() {
char c = '9';
if(isdigit(c)) printf("%c is a number! \n", c);
}

Or even:

#define isnum(x) \
((x >= '0') && (x <= '9'))

>>11
fuck you off topic moron

>>10

Hahaha, very good

>>10
You forgot the singleton and factory

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