Checking if there were no arguments on commandline

Question

While I was going through some tutorial one of the source code file had following to check if there were no command-line arguments :

if (null==args[0]) {
  System.err.println("Properties file not specified at command line");
  return;
}

Which for obvious reasons throws ArrayIndexOutOfBoundsException and doesn't print the message.

So,how to do this check and print the message without getting the exception being thrown?

score 7 · Answer 1 · answered Mar 04 '13 at 13:05

7

if (args.length == 0) {
  System.err.println("Properties file not specified at command line");
  return;
}

When there are no arguments on the command-line, the argument array will be empty. So, you check for its length args.length==0.

answered Mar 04 '13 at 13:05

Ankit

score 1 · Answer 2 · answered Mar 04 '13 at 13:06

1

 if (args.length == 0)

Just check the length.

answered Mar 04 '13 at 13:06

tckmn

2 Answers2