What is in argv?

Question

  public static void main(String[] argv) {

      Connection connection = DatabaseDriverExtender.connectOrCreateDataBase();
      if (connection == null) {
        System.out.print("NOOO");
      }
      try {
        //TODO Check what is in argv 
        //If it is -1
        /*
         * TODO This is for the first run only!
         * Add this code:
         * DatabaseDriverExtender.initialize(connection);
         * Then add code to create your first account, an administrator with a password
         * Once this is done, create an employee account as well.
         * 
         */

How do I check what is in argv? I'm not familiar with this.

I'm assuming it checks if the database is already created or not. If its not created its -1. How would I check what is in argv and find when its -1?

argv is a String[] ?

"I'm assuming it checks if the database is already created or not." Why? — Dabiuteef, Nov 22 '17 at 06:03
In the main function, argv will be an array of the arguments passed to it from the command line. — jonny, Nov 22 '17 at 06:04
@Dabiuteef I'm trying to do it like that. -1 would be first run only. I just don't know how too — teemo timmy, Nov 22 '17 at 06:20

score 0 · Answer 1 · answered Nov 22 '17 at 06:06

0

Yes, "argv" is just a String array.

For your code u can just do something like that:

if (argv.length > 0) {
//check if argv[0].equals("-1") or something like that
}

answered Nov 22 '17 at 06:06

Ilya Sosnin

41
7

score 0 · Answer 2 · answered Nov 22 '17 at 06:12

0

String[] argv is a collection of Strings, separated by a space, which can be typed into the program on the terminal. You can find the more detail about it on this link:

What is "String args[]"? parameter in main method Java

answered Nov 22 '17 at 06:12

Vidhika Jain

16
3

score 0 · Answer 3 · answered Nov 22 '17 at 07:03

//when using main method argv cannot be null. But if using somehwere else check if array is not null and then access the elements
public static void main(String[] argv) {
    int len=argv.length;
    System.out.println("No. of elements :"+len);
    for(int i=0; i<len; i++){
        String indexValue=argv[i];
        System.out.println("Array Index value:"+indexValue);
        if("-1".equals(indexValue)){
            //value is -1
        }else{
            //value is not -1
        }
    }
}

What is in argv?

3 Answers3