Learn Java Tutorial for Beginners, Part 31: Generics and Wildcards

-------------------------------------------------------------------------------------------------------------------------------------------
This is a tutorial on using the wildcard with generics in Java; a useful but quite advanced technique.
--------------------------------------------------------------------------------------------------------------------------------------------

[nickosmark]

For those who dont get the loop :
for(String value : list ){
System.out.println(value);
}
This is a for-each statement . that's eqiuvalant to this :
for (int i= 0; i< list.size();i++) {
String value = list.get(i);
System.out.println(value);
}
Please upvote to avoid questions .Thanks for the tutorial :)

[caveofprogramming]

It's covered in my video "Java for Complete Beginners, Part 11: Arrays of Strings" ... this covers arrays, but actually it works for most collections. Sorry about hissy hifi sound in this video ...

[visheshkumar]

thanks for the quick reply john. i did the whole thing over from scratch in another java project and it worked fine. i think my eclipse was bugging out for some reason. Love the tutorials, your tutorials are the best on the net. Much respect

[caveofprogramming]

I forgot to say, I've got a video on Iterable coming out hopefully soon ... this will explain how this kind of for loop works behind the scenes too ...

[Thegamer-ypqq]

this one is the greatest java video ever

[seandougan]

Oh the fun I am going to have with this, my first time coming across type parameter wildcard bounds.

My sincere gratitude

[IslamElshobokshy]

Amazing explanation, I found this part in Java super hard to understand, but your explanation is the easiest of the hardest I found on the web. Thanks!

[japhethjay]

Your's is one of the few videos i have liked, and trust me i have watched quite a few. Thanks a lot man awesome vids. Keep them coming

[thestarinthesky_]

How incredebile you are! You should be teaching at Harvard. You are amazingly amazing. This is quite advanced and you make it so simple for us. Thank you soooo much. I appreciate it. I wish you could upload more videos and could update your channel.

[avhd]

Edited*: lol a little all over the place with this one. You're still one of the best when it comes to full tutorials though : ) I'm learning a lot because of you. Thanks

[jagermeister]

One of the greatest videos in Java history. Thank you very much

[justintimesYT]

Excellent videos.  It all makes sense.  The problem is knowing when to use these things in your own designs.  As with a lot of things in programming.

[zmaktag]

Thanks a lot i was sturggling to do my uni project, you are life saver! ....excellent tutorial series

[andriusrimkus]

Thanks, everything starts to make sense!

[jagadeshg]

all the topics are crispy and to the point ....wonderful effort ! thank you.

[heatlife]

Okay Finnaly, I believe I got it thanks to my "Re-watch the Video if you still dont get it" skill lol Thanks :D

[fiercelizzard]

love the videos... I think i'm going to get the swing course on udemy!

[caveofprogramming]

Maybe ... you also need a very firm grasp of the contents of at least two of my previous videos, on upcasting/downcasting and on polymorphism. It won't make sense without this background knowledge. It's also possible that I may have jabbered like a lunatic throughout the video :)

[majdrezik]

Thank you so much! that was really helpful and clear... keep it up :)

[tjabercrombie]

This is a great video! Thank you so much for this! I'll probably get an A on my mid-term thanks to you :)