How to give numeric command in java

i have following codes, there is no error in code. it displays
command = Integer.parseInt(args[2]);
if (command == 0 || command == 1 || command == 2 || command == 3) {
filename = args[3];
when i run it displays
0 - to upload
1 - to download
3 - to show all
4 - to exit
but now when i enter 0 in same command prompt after executing this statement
it says it can't understand

args[2]Do you understand what this means? You need to invoke your program with at least 3 arguments and the third one has to be an integer.
GOOD
java MyProgram one two 3
java MyProgram 1 2 3 4 5
BAD
java MyProgram
java MyProgram 1 2 three

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