How do i discover if argStrings is empty

ook...this is my first post here so hello to you all...
i have recently started a computing degree so will be around lots over the next few eyars asking lots and hopefully later helping lots...
anyway...
i have a program that is calling the first value from argStrings (it ignores the rest), but I want a message to pop up if nothing is specified (I am running java from the command prompt). How do I get my program to see if argStrings is empty and put up an error message...
this is what ive got so far but it still doesnt work
if(argStrings[0] == "")
System.out.println("You need to specify a value");
else
Run the programcheers in advance

I think you might want this instead:
if(argStrings.length ==0)

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How do i discover if argStrings is empty

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