Program java arguments

Applications Programming
1

Hello,

The arguments are strings. In my code I need them to be a different type, I do the cast but it is not feasible ...
Have you any idea?

Thank you

2

Arguments are character strings. What datatype do you need them to be?
args are the command line arguments

int firstArg;
if (args.length > 0) {
    try {
        firstArg = Integer.parseInt(args[0]);
    } catch (NumberFormatException e) {
        System.err.println("Argument" + " must be an integer");
        System.exit(1);
    }
}
3

No, it is not an integer. It is an object of a class that I use from an API.
the exception is : cannot cast from string to the object

Please have you an idea?

4

The shell doesn't handle objects but strings. You should give more clues about this API and what class you are referring to. Casting a string to it is certainly a wrong approach. You should also explain how you pass this object to the shell in the first place.

5

i use the freepastry API ,
inside my java program prog1.java i call a script (./script.sh a );a is a NodeHandle
script.sh

i want that $1 will be an object NodeHandle in prog2.. but the exception is cannot cast from string to NodeHandle

Thank you

6

If NodeHandle is serializable, store it somewhere on disk and pass its filename to prog2.

7

Yes the NodeHandle is serializable, i store it in a buffer like that?

Please how can i deserialize it after?

8

Don't store it in a buffer, store it in a file. I would suggest using ObjectOutputStream to do it. To deserialize, read the object in the second java application by using ObjectInputStream.

9

Thank you so much :slight_smile:
I stored the nodehandle in a file and it works, I also need serailiser another object type app I've done it myself, this object contains an attribut that is an object that is not serializable and I need this attribute (this attribute is also from freepastry api ..)
Have you any idea please?