just a problem....H E L P ! ! ! !

[ratul banji]

Which code fragments will print the last argument given on the command line to the standard output, and exit without any output and exceptions if no arguments are given?
1.
public static void main(String args[ ])
{
if (args.length != 0) System.out.println(args[args.length-1]);
}

2.
public static void main(String args[ ])
{
try { System.out.println(args[args.length-1]); }
catch (ArrayIndexOutOfBoundsException e) { }
}
3.
public static void main(String args[ ])
{
int i = args.length;
if (i != 0) System.out.println(args[i-1]);
}

4.
public static void main(String args[ ])
{
int i = args.length-1;
if (i > 0) System.out.println(args[i]);
}

5.
public static void main(String args[ ])
{
try { System.out.println(args[args.length-1]); }
catch (NullPointerException e) {}
}
Answer is given :
code 1
code 2
code 3

BUT ..how ??? code 1 and 3 r not creating any exception if args value is 0. I am not understading the overall concept of this question.
pls...any1 explain this 2 me.
THANKS IN ADVANCE.
<marquee> ratul banerjee </marquee>

[Thomas Paul]

1.
public static void main(String args[ ])
{
if (args.length != 0) System.out.println(args[args.length-1]);
}
3.
public static void main(String args[ ])
{
int i = args.length;
if (i != 0) System.out.println(args[i-1]);
}
If args[] is empty, args.length returns 0. args.length can not throw an exception since at the very least args[] is an empty array.

[sandeep bagati]

Originally posted by ratul banji:
Which code fragments will print the last argument given on the command line to the standard output, and exit without any output and exceptions if no arguments are given?
1.
public static void main(String args[ ])
{
if (args.length != 0) System.out.println(args[args.length-1]);
}

2.
public static void main(String args[ ])
{
try { System.out.println(args[args.length-1]); }
catch (ArrayIndexOutOfBoundsException e) { }
}
3.
public static void main(String args[ ])
{
int i = args.length;
if (i != 0) System.out.println(args[i-1]);
}

4.
public static void main(String args[ ])
{
int i = args.length-1;
if (i > 0) System.out.println(args[i]);
}

5.
public static void main(String args[ ])
{
try { System.out.println(args[args.length-1]); }
catch (NullPointerException e) {}
}
Answer is given :
code 1
code 2
code 3

BUT ..how ??? code 1 and 3 r not creating any exception if args value is 0. I am not understading the overall concept of this question.
pls...any1 explain this 2 me.
THANKS IN ADVANCE.
<marquee> ratul banerjee </marquee>

The explanation for ist and 3rd is given above
There is nothing wrong with the second option for u are catching the AIOB exception for it would have occured for no arguements but since u are not printing anything when u are catching the exception i:e is in yr catch handler u are not printing anything so no output.A good advice do read the question properly.U get a lot of time to solve it inactual test.
sandeep

[Tanveer Mehmood]

Whats wrong with 4th option???
Tanveer

[sandeep bagati]

Originally posted by Tanveer Mehmood:
Whats wrong with 4th option???
Tanveer

in that case for length=0 it will be a[-1] AIOB exception
sandeep

[ratul banji]

Hi all,
Yes..I understood now.
sorry ..folks..I mis-understand the 1st line of the q.
yes..sandeep..u r right... better to read the question properly
thanks.
ratul banerjee