Java, getting an ArrayList index by object

问题

so I have hit a little problem in my code I have:

synchronized(clients)
            clients.remove(this);
}

for when a client disconnects, but now I need to be able to send the name of that client to all the other clients, and to do this I essentialy need to do something like

synchronized(clients)
            broadcast("Remove:"+clients.get(this).name);
            clients.remove(this);
}

but obviously I can't get an index with the "this", so how do I go about getting the right clients name? Thanks!

回答1:

why don't you simply use this.name? As you already have the object why do you need to get the index to again get the object?

Edit:

To answer the question in the title(to get index of the object) use indexOf

回答2:

Did you look at the indexOf function in ArrayList?

回答3:

int index = clients.indexOf(this);
// Do what ever...
clients.remove(index); // or clients.remove(this);

回答4:

I think you want to remove specific object from list. If you get index from your code

int index = clients.get(this)

Then you can remove easily

clients.remove(index);

or if you get object from list then remove

clients.remove(object) // remove by object

来源：https://stackoverflow.com/questions/12225010/java-getting-an-arraylist-index-by-object