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If i am providing two arguments over the command line args[0] and args[1]. How do individually check if either of the arguments are empty/null?

Sam
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    They wouldn't be present if they were empty / null. – Elliott Frisch Aug 22 '16 at 01:34
  • But if i need to set them to a variable how do i check if they are null/empty? – Sam Aug 22 '16 at 01:35
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    check the length of the Strings args array – Scary Wombat Aug 22 '16 at 01:36
  • So args[1].length() == 0? That still does not seem to be working. The only one i need to check if whether null is args[1], i don't care about arg[0]. – Sam Aug 22 '16 at 01:38
  • so i should check if(args.length < 1)? This still does not seem to be working. – Sam Aug 22 '16 at 01:42
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    Define "not working". – Dave Newton Aug 22 '16 at 01:48
  • @sam `so i should check if(args.length < 1)?` yes something like this (based upon your logic). – Scary Wombat Aug 22 '16 at 01:58
  • The argument strings will not be null. The `args` array will not be `null`. (Exception ... if you call `main` from your own code with bogus args ...) Of course, args.length could be zero, or any of the args could be an empty string. But no `null` values are possible if `main` is invoked normally on JVM startup. – Stephen C Aug 22 '16 at 02:00

1 Answers1

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Here is a simple example Sam:

if (args.length > 0) {
    if (!args[0].isEmpty()) { 
        // Do whatever with arg[0] (the first argument)
    }
    if (!args[1].isEmpty()) { 
        // Do whatever with arg[1] (the second argument)
    }
}
DevilsHnd - 退職した
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