CS 61B Lecture 3: Defining Classes

[bliu94539]

I'm so glad to be IN his class. BAHAHA.

[fatabass]

he never created a Human Object that is referenced by Rishi, yet used in method copy... what gives

[neil8811]

rishi is an indian name.this shows that indians r rocking in UCB also :P

[joeshmoe005]

excellent lecture. really wish i had the money to go to a private school like this!

all my classes seem to be taught by bumbling / apathetic idiots sigh.....

[syncopowerstations]

He's good. I'd like him to develop his Malkovichian (John Malkovich) persona more finely, however.

[sabasania]

wont u get a privacy leak with name=name.original, now original.name and newhumanobject.name refer to same String object, so either way, u can access and modify e.g. original.name=new String("Tom") and now newHumanobject.name and original.name both contain reference to a String object Tom, though we intended to modify only one, i.e. original.name

[kimoloveals]

no because in Java Strings are immutable,there value can't b changed once they r initialized

String s1="1";

String s2=s1; //Now both s1 and s2 point to one object with the value "1"

s1="2"; //Now s1 points to an object with the value "2", while s2 is still "1"

This happens because the statement (s1 = "2") doesn't change the value of the String object they point to,but instead,it creates new String object with the value "changed" and changes s1 so that it points to that new object.

[jasperwillis5385]

Good video.

[claircote4416]

I like this video.

[liang8231]

This video is good.

[minami935]

Great lecture.

[JJboy1992]

Wow that blackboard would be annoying haha

[TheGrahamBrechin]

this.professor is awesome... :)

[Gtfokitty]

Look at all those late people!

[99SintaX]

I have studied programming for 8months now and I have a firm grip on reading code and all the variables conditionals etc. and I think this class would be very hard for people never having programmed before, and for the scheme people Im sure it would be difficult for them , altogether im only on lecture 3 I hope he descibes some of the operaters etc more in depth for the noobies :)

[icemann12489]

This is a great professor. Me 2 wish 2 get into UCB...

[rsaiprasad]

when we say Human hum = new Human(); how much memory is allocated? (int + string)*2 ? because "hum" is of human type and new creates another object of Human type which hum refers to?

[rsaiprasad]

34:54 I think its wrong to say that kayla got copied to this? cause if the value of age and name of "this" change in the method then even the age and name of kayla gets changed?

I think that is the question answered at 47:40 ? or is that, object is copied into the method when its called as "this" and when the method exits the original object refers back to this ?

[fatabass]

@rsaiprasad what he is saying is correct. this point so whatever kayla is pointing to. when you play with something that "this" points to, it means the object that was pointed to by kayla has changed as well.

[fatabass]

@fatabass I meant : "this points to, not this point so"

[maiiroo]

that teacher has a really awesome attractive personality n style he surely rocks

[programmer1905]

great teacher, he's got class

[trc777]

Great lecture!

[RAIZHW]

I wish I could have the money to go the UCBerkeley  these proffesor is awesome.....

[joeshmoe005]

@RAIZHW lmao well judging by your grammar, you could never get in...

[chaniwie]

good good.

[comwizzz123]

what is really the point of copying someone else's personal details into another?? :-s

[Lioobayoyo]

obviously it's only a pedagogical example made to briefly illustrate the topic he was talking about before that; and by the way introduce the student with the language.

The only point to do that is to make a simple example of a copy. (as it happens with String when you call the copy constructor)

[pagola]

@comwizzz123 maybe you have a student who has changed his address and phone number and certain stuff....so just copy the new details to the old persons object...but wait that doesnt make sense cause why wouldn't you want to change the fields and data right there in the persons object right lol so yeah im with you i dont know why

[AnitaLife27]

Prof. Shewchuk, where have you been all my semester!!!!

This is wonderful! I'm bashing my head in with a text book, feeling like a low grade maroon (sic) about writing classes in particular....This really brings the subject alive!!!

[dankadence]

This guy is a great tutor, I wish that I had the chance to go to uni and sit in on these lectures.

[zugelmm]

Java, he es teaching Java.

[dosattack777]

Im seriousl thinkng about going to berkly. I like how they move the classes forward and don't waste alot of time. Does anybody know what languages they teach? Ive had a couple c# classes as well as java. Weird there teaching this stuff in Data Structures. Maybe they break it up in two classes. This stuff seems a little simple for Data Structures.

[dosattack777]

how much does it cost to go to berkly?

[faridjabba]

stil using chalk these days ?I use markers, what sit he topic here?wjat program pls?

[interxavierxxx]

it has something to do with the classroom lights illuminating the board, which makes it difficult to see for a relatively large class.

[pengo2007]

he secretly knows abt the stalker at the bk filming this..

[shobadobs]

Why is he wearing a tie?