CODEWITHSUNDEEP
javaclassanonymous-class
Teddy
Teddy

Reputation: 2006

How can anonymous class method parameters be returned to the original instantiating class?

Here's my code:

public void pollLocation()
{
    myLocation.getLocation(this, new LocationResult()
    {
        public void gotLocation(Location location)
        {
            //I want to assign Location object from here...
        }
    });
}

private Location lastLocation; //...to here.

Is this possible?

Upvotes: 2

Views: 116

Answers (3)

Jord Sonneveld
Jord Sonneveld

Reputation: 456

Make lastLocation a final java.util.concurrent.atomic.AtomicReference and set it to your heart's content.

(Edit: you sure a simple assignment doesn't work? It looks like that works in Eclipse ...)

Upvotes: 0

Robert
Robert

Reputation: 2669

Yes. Generally you can just write

lastLocation = location

But maybe the LocationResult class/interface also has a field named lastLocation. In this case you have to write

OuterClassName.this.lastLocation = location

But since it looks like you would do some asynchronous polling, it's too dangerous to do this without synchronization. Also you wouldn't notice when the lastLocation gets set. So it's better to use a synchronized setter in the outer class.

Upvotes: 2

Bruno Reis
Bruno Reis

Reputation: 37822

You could use a setter:

public void pollLocation()
{
    myLocation.getLocation(this, new LocationResult()
    {
        public void gotLocation(Location location)
        {
            //I want to assign Location object from here...
            setLastLocation(...);
        }
    });
}

private Location lastLocation; //...to here.
private void setLastLocation(Location l) { lastLocation = l; }

Just be careful about multithreading issues. If you are using multiple threads, you'd better declare lastLocation volatile or use an AtomicReference. Otherwise, your code might not work as you expect.

Upvotes: 1

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