Chained Exceptions

[Jromero]

Hi,

I have a problem with chained the exceptions. I know the try and catch should be in main method but in this case I have 2 methods and the main method needs to throws an exception
The exception is called NumberFormatExc eption

I need Help..

Code[

public class Hexnumbers{


public static int conv1(String s) {
String digits = "0123456789ABCD EF";
s = s.toUpperCase() ;
int val = 0;
for (int i = 0; i < s.length(); i++) {
char c = s.charAt(i);
int d = digits.indexOf( c);
val += d*Math.pow(16, s.length()-1-i);
}
return val;


}


public static String conv2(int d) {
String digits = "0123456789ABCD EF";
if (d == 0) return "0";
String hex = "";
while (d > 0) {
int digit = d % 16;
hex = digits.charAt(d igit) + hex;
d = d / 16;
}
return hex;
}



public static void main(String[] args) {


int sum = 0;

for (int i = 0; i < args.length; i++) {
System.out.prin tln(args[i]);


int decimal = conv1(args[i]);
System.out.prin tln("Here is the decimal number = " + decimal);
sum += decimal;

String hex = conv2( decimal);
System.out.prin tln("Here is the Hex number = " + hex);

System.out.prin tln("Here is the sum of **Hex** + **Decimal** == " + sum);
}




}






}

]

[r035198x]

Hi,

I have a problem with chained the exceptions. I know the try and catch should be in main method but in this case I have 2 methods and the main method needs to throws an exception
The exception is called NumberFormatExc eption

I need Help..

Code[

public class Hexnumbers{


public static int conv1(String s) {
String digits = "0123456789ABCD EF";
s = s.toUpperCase() ;
int val = 0;
for (int i = 0; i < s.length(); i++) {
char c = s.charAt(i);
int d = digits.indexOf( c);
val += d*Math.pow(16, s.length()-1-i);
}
return val;


}


public static String conv2(int d) {
String digits = "0123456789ABCD EF";
if (d == 0) return "0";
String hex = "";
while (d > 0) {
int digit = d % 16;
hex = digits.charAt(d igit) + hex;
d = d / 16;
}
return hex;
}



public static void main(String[] args) {


int sum = 0;

for (int i = 0; i < args.length; i++) {
System.out.prin tln(args[i]);


int decimal = conv1(args[i]);
System.out.prin tln("Here is the decimal number = " + decimal);
sum += decimal;

String hex = conv2( decimal);
System.out.prin tln("Here is the Hex number = " + hex);

System.out.prin tln("Here is the sum of **Hex** + **Decimal** == " + sum);
}




}






}

]

1.) Use code tags when posting code.
2.) Your convert methods are the ones that can throw the exceptions so they are the ones that must be declared as throws whatever execption. Your main should then handle those exceptions using try/catch.

[JosAH]

Hi,

I have a problem with chained the exceptions. I know the try and catch should be in main method

That is not true; any block of code in any method can be a try ... catch block.
As a rule of thumb you should catch a thrown exception as close to where it makes
sense. It is not 'fair play' to have main() handle them all because it doesn't know
what do to with them at that outer most level.

kind regards,

Jos