0:00:00.180,0:00:03.360 That might have been tricky. The answer should look something like this. There 0:00:03.360,0:00:05.942 might be other ways to do it, but I think this is the simplest one. If you 0:00:05.942,0:00:10.245 didn't get this, it's okay. There's more practice coming up. There are some 0:00:10.245,0:00:13.740 subtletles to how this method works, so let's go through an example. Let's say 0:00:13.740,0:00:18.610 we have two variables, one for Maria and one for Jamesha. Each of those should 0:00:18.610,0:00:24.030 contain a person object with a name and friends. We have string objects. For 0:00:24.030,0:00:28.290 Maria's name, Maria's current friends, Jamesha's name and Jamesha's current 0:00:28.290,0:00:33.470 friends. Let's say we call maria.addFriend(jamesha). We call this method on the 0:00:33.470,0:00:38.110 maria object and we pass in as an argument the Jamesha object. Now, when this 0:00:38.110,0:00:42.320 line runs, the first thing that it does is creates a new string from these 0:00:42.320,0:00:45.890 ones. This will be the new string that's created. It's going to put together 0:00:45.890,0:00:52.150 friends, friend.name, and a space. Friends is the friends of the maria object 0:00:52.150,0:00:56.520 because that's what we called the method on. So, we go to the Maria object, and 0:00:56.520,0:01:02.146 friends is currently just TJ, with a space. friend.name is the friend, the 0:01:02.146,0:01:07.540 argument, which was the Jamesha object, dot name, which is Jamesha. And the 0:01:07.540,0:01:11.962 space is just a space. So, when these strings get put together, it'll look like 0:01:11.962,0:01:18.599 TJ Jamesha. Now the string created by this part will be assigned into the 0:01:18.599,0:01:23.170 friends variable. So, the old reference will go away and a new one will be 0:01:23.170,0:01:28.180 created. And now, Jamesha appears in the friends of Maria. The old friends 0:01:28.180,0:01:32.780 string that contained just TJ might still be around. And it hasn't changed, but 0:01:32.780,0:01:36.342 the friends variable in the Maria object now contains a reference to a 0:01:36.342,0:01:38.259 different string.