Need to test argument for contents 1

[blues77]

Hello,

I need a way to check an argument that is passed on the command line to my application to make sure that it is a positive number. For example if I ran "application abc 3"
my code should check each of the arguments in this case "abc" and "3" and it should alert the user that argument "abc" is not a number (in other words I can't use Integer.parseInt) to extract a number. Any suggestions on how I could do this would be appreciated!

Thanks
Mike

 

[techmat]

The Integer.parseInt method throws a NumberFormatException "if the string does not contain a parsable integer".(

http://java.sun.com/j2se/1.4.2/docs/api/java/lang/Integer.html)

You should be able to catch the exception like this:

for (int i = 0; i < args.length; i++) {
try {
Integer.parseInt (args);
}
catch (NumberFormatException e) {
System.out.println ("Argument "+args+ " is not an integer.")
}
}

 

[prosper]

public class inp
{
public static void main(String args[])
{
//System.out.println(args.length);
int i=0;
boolean isInvalid[] = new boolean[10];
if (args.length>0)
{
for (i=0; i<args.length; i++)
{
//System.out.println("***"+args[0].length());
for (int whichChar=0; whichChar<args[0].length(); whichChar++)
{
//System.out.println(args.length()+"position"+whichChar);
if ( args.charAt(whichChar)<'0' || args.charAt(whichChar)>'9')
{
if (args.charAt(whichChar)!='.')
{
isInvalid = true;
}
}
}
}
for (int m=0; m<args.length; m++)
if (isInvalid[m])
System.out.println(m+" argument "+args[m]+" is not a number");
}
}
}

 

[stefanwagner]

Hy prosper!
What about 1.1.234.45?

Hy techmat!
What's about long, float, double, BigInteger, BigDecimal?

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