Is there a way to take an argument in a callable method?

Question

I have created a piece of code which takes an IP address (from main method in another class) and then loops through a range of IP addresses pinging each one as it goes. I ha

Answer 1

You can't pass it as the argument to call() because the method signature doesn't allow it.

However, you can pass it as a constructor argument; e.g.

public class DoPing implements Callable{
    private final String ipToPing;

    public DoPing(String ipToPing) {
        this.ipToPing = ipToPing;
    }

    public String call() throws SomeException {
        InetAddress ipAddress = InetAddress.getByName(ipToPing);
        ....
    }
}

(I've corrected a couple of egregious code style violations!!)

Alternatively, you could:

• declare DoPing as an inner class and have it refer to a final ipToPing in the enclosing scope, or

• add a setIpToPing(String ipToPing) method.

(The last allows a DoPing object to be reused, but the downside is that you will need to synchronize to access it thread-safely.)