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Exception

kirba devi
Ranch Hand

Joined: Jun 29, 2007
Posts: 50
Hi,
i have a program called "Passwordchecking",at runtime it is throwing ArrayIndexOutOfBoundsException.
i know the reason of why it is throwing that kind of exception.here's the code

class Passwordchecking
{
/**
*
Aug 12, 2007@param args
*/
public static void main(String args[]){

boolean ACCEPTED=true;


if((args[0].length()>=4) && (args[0].length()<=12)) {
String s=args[0];

if((s.charAt(0)>=97 && s.charAt(0)<=122)||(s.charAt(0)>=65 && s.charAt(0)<=90))
{
for(int i=0;i<args[0].length();i++)
{
char f=s.charAt(i);

int g=s.indexOf(f,i+1);

if(g==-1){
continue;
}
//if(g==(i+2)){
//if(s.charAt(g)==)

System.out.println(s.indexOf(s.charAt(g),i+1));

String fs1=s.substring(s.indexOf(f),i+2);

String fs2=s.substring(g,g+2);
if(fs1.equals(fs2)){
ACCEPTED=false;
System.out.println("Rejected");
break;
}else{ if(g!=s.length())
continue;
else
System.out.println("Accepted");
}
// }else
// continue;
}
}else{
System.out.println("Rejected");
}
if(ACCEPTED)
System.out.println("Accepted");
}
else
System.out.println("Rejected");


}
}

i want to show the output "Rejected" in case if user not passing arguments to the main method.
How can i do that?

Regards
Kirba.
Jesper de Jong
Java Cowboy
Saloon Keeper

Joined: Aug 16, 2005
Posts: 14441
    
  23

Look at the stack trace of the exception message. It tells you exactly in which line of code the exception happens. Then lookup that line in your code and find out why the exception happens there.

Note that if you have an array with N elements, then you can access the elements with the indices 0 to N-1.

This program expects an argument on the command line (which is passed to the main() method in the parameter 'args'). So when you run it, you must specify the parameter on the command line, for example:

java Passwordchecking helloworld

Note that class Passwordchecking should also be public. Add the word 'public' before the class declaration:

public class Passwordchecking { ...

If you want to see if the user has given any command line parameters, then you should check the length of the 'args' array:

Trying to access args[0] if 'args' has no elements will result in an ArrayIndexOutOfBoundsException.


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kirba devi
Ranch Hand

Joined: Jun 29, 2007
Posts: 50
Thanks Young

Regards
Kirba.
 
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subject: Exception