Quick check if a String argument is actually an int?

[paulbradley]

I have code that does certain stuff if it gets an intger argument, and other stuff if it is String.

How can I quickly check if one of my args from command line is actually an integer without doing a parseInt and catching an exception if it is not?#

Thanks

 

[sedj]

One way would be to convert the String to a char array, and then do Character.isDigit() on each char.

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[Diancecht]

No need to convert it to a char array, you can just loop until the lenght of the String using charAt, but that's exactly what parseInt does, and it also cares about negative signs, hex formats so ... why would you want to code something that is already done and fully tested?

Cheers,
Dian