Exactly! I understood the concept, but didn't get why and when we should use it... it's like reading a manual of a hammer, but not knowing when I should use one!
I wanna cry at how good these videos are, your explanation and walkthrough is just flawless. Thanks John I REALLY appreciate the work and content you're putting out here man, seriously appreciate you.
That last part with that almost straight face was so funny, people be binge watching something on netflix and I be binge watching your videos they are so crisp and clear and easy to understand, a bow down to you.
Probably one of the best explanations I've gotten so far about abstraction. I've been so stuck on this concept, but now I have a better understanding on how to tackle my assignment. Thank you!
Also worth noting that abstraction as a concept is great for making your code maintainable- if you decide later on to use some other implementation, you can switch it out because it implements the same abstract class, and calls on it won't break the rest of your code
Got much clearer undertstanding when and where to use Abstract and Interface. I never saw anyone explain this easy and quick. Would be happy to learn more concepts from your videos.
You explain things SO well. I keep turning to your videos instead of class lecture material to really understand these concepts. THANK YOU for doing this - it truly makes all of the difference. Seriously appreciate your videos and what you do.
The tempo/pace of your uploads are really optimal. You keep it on point without getting into bunch of sidetracks. Those times I've wanted to quickly understand a topic and chose one of your videos, I've never felt restless because of slow talking or too much information and yet got a good understanding of the topic. Keep it up!
This video is beautiful.. Please make a whole series on java programming and frameworks, it would have some of the less privileged ones to actually learn and do something on their own. Thanks :)
Absolutely fantastic. This example will help shape your understanding of Abstract methods and Interfaces, how to implement an abstract method, the differences between abstract classes and interface, and it was all done in 7:00 minutes. Very clear, very easy to understand. Thank you!
Needed clarification on whats the actual purpose of using an abstract class .Really simple and clear explanation for a beginner like me to follow . Thank you John !!
wow i really love how you explained the difference between a class and interface, really made it a lot simpler to understand compared to my current course in school, big thanks!
Thank you so muck for your lesson. I have stucked in a concept of abstract for so long. so now on I will consider using an abstract class in my project.
it took you 7 minutes including an introduction for the same content my teacher talked for hours( and I still wasn't sure what the hello was going on). Awesome, now I understand. Thank you.
Thankyou so much for helping me study for my java programming final exam ! Your ability to go into further detail and give extra examples as you did when mentioning interfaces is always brilliant.
Thank you John so much, I have sit in a 4 hour long lecture for these stuff but could not understand. With your explanation in 7 minutes, I totally get it. I wish the best for your channel. you have very practical example. I like it.
Hello John Abstract Class is a flexible dynamic Interface and I can say it is a CONTRACT Statement that we NEED and Must enforce the client to apply for example. Thank you so much for your clear video. Allah bless you. Regards
Something I often dislike about coding tutorials is that the obvious questions of why and how aren't addressed or beat around the bush on. Thank you for explicitly stating and answering all the doubts I had in mind. Appreciate it :)
Another coment. Tbh i have never seen a better programming chanel in my whole live. Explenations are always on point, I always get it straight away. We appreciate your work :)
This video was so succinct, to the point, and helpful. Thank you! I know you made this video a year ago as of now and I imagine your videos have only gotten better and better, but I did want to offer one suggestion: I felt that several times during the video it was very hard to keep track of what you were talking about while you were jumping back and forth between class, interface, abstract class etc. I had to rewind video several times and pause just to think about the last thing you said. It could just be me! But as a beginner, I suggest you keep that in mind and try to slow down the jumping back and forth and explaining a little slower. I dont know how else to put it. Once again, fantastic video, and super informational! Even though I had to rewind parts, once it clicked and I went onward it just all made sense and there wasn't a lot of fluff.
I allways wathc spanish videos for programming, but in this case i'm amazed by your explainning form. Thanks for all your videos and for sharing all your knowlege in an easy way to understand. Greetings from Argentina!
Thanks a lot for sharing your knowledge. I am still learning very important details from you after 20+ years of experience. You are one of the best teachers out there on java. Hats off to you sir.
John I am learning java and I am on an intermediate level but your videos always help. I wanted to make sure the things I knew about interfaces and abstract classes were right and now I'm sure more than ever. Thank you
I just found this guy and Oh my he is a Gem. His videos undoubtedly have the best, most precise, crisp information anyone will ever need. I spent hours trying to learn abstraction and polymorphism, while he did it in just 7 + 7 minutes. Can't stop stressing on how good his content is 💯
I have seen multiple videos on this topic and all of them were badly explained and confusing. Now I watched yours, and I am impressed how well you can explain stuff. Thank you.
Here I am, back on this video after viewing it a while back while in school. Just recently graduated and when John says it's a common interview question...it really is. I just had an interview and I was only able to explain an interface ☹️. Word to the wise, listen to John! ❤
I came upon this while learning through the MOOC course for Java and I was just dumbfounded cause I couldn't understand anything. So I looked for a supplemental video and went here first since you always explain concepts incredibly well. And wow abstract classes are cool. I literally had my mouth open while watching cause I was amazed by the concept lol
john i just want to seriously say thank you for saving me. my professor is so unclear, on top of a thick accent, and i struggle in the course due to those combined. i cannot say thank you enough
Another reason why you might want to have an abstract class is because you may need to store a generic ArrayList of the parent abstract class type, e.g. ArrayList where you can store any concrete subclasses in the same array. Excellent vid John!
John, thank you so much. It was soo hard for me to understand all the stuff about abstraction. You could explain me it in just 7 minutes 😢.And not only abstraction, all your videos are soo precious. I think you are the best tutor but so underestimated. Now I am going to buy your full course tutorial. Thank you so much ❤❤
Hey man, amazing video ! Exactly what I was looking for! I was looking for abstract class vs interface , and this was exactly that. Even though you didn't mention "interface" in your video's title. Consider doing that maybe. YOUR EXAMPLES ARE REAALLY GREAT ! Carefully chosen to explain the core diferences. I don't recall anybody explained that better. I don't usually write comments on youtube, but you deserved it, my man!
This is great, simple and understandable. specially I think some what experience developers may know already about what is abstract class and what is interface, and if they like me they may use it in their day to day life. But most of the time it is hard to describe what is the difference and when should we use abstract class and when should be use interface. You cleard out the problem with very simple example that anyone can understand. Hats off and keep up the good work.
Our teacher has been explaining this concept for three lectures. Finally, she gave us a task related to these. Ofc, I didn't know anything so a friend shared this link and man God bless you because Holy, I get it now. Finally. Thankyou smmmmm.!
Love that you explicitly ask and answer the question that every beginner would have: "Why would I want to do this?" Five stars.
agreed
Exactly! I understood the concept, but didn't get why and when we should use it... it's like reading a manual of a hammer, but not knowing when I should use one!
Right?! I think this is why his tutorials/explainations are so good. I am always asking "Why?" or "When?" when learning about these concepts.
Yes, that's why Im always looking for his videos, just for that question
When John starts "Now, you're probably thinking...", you're like "How did he know what I was thinking?" 😅
Been staring at and abstract problem for hours trying to actually understand whats going on. Clarified it in a few minutes perfectly. Thanks Man!
I wanna cry at how good these videos are, your explanation and walkthrough is just flawless. Thanks John I REALLY appreciate the work and content you're putting out here man, seriously appreciate you.
My god, you were able to explain everything in just a few minutes when it was taking hours for myself to understand. Thank you!
That last part with that almost straight face was so funny, people be binge watching something on netflix and I be binge watching your videos they are so crisp and clear and easy to understand, a bow down to you.
I have never understood the Difference easier in my 6 years of experience. But you Made me understood this in juz 6 mins. A Royal Salute...
Dude, you truly are amazing. Thank you. I'm an engineering student and you have teached me far more than any of my programming professors have!
Couldn't agree more
Probably one of the best explanations I've gotten so far about abstraction. I've been so stuck on this concept, but now I have a better understanding on how to tackle my assignment. Thank you!
Yeah, sometimes weird examples really helps u understand concept.
Also worth noting that abstraction as a concept is great for making your code maintainable- if you decide later on to use some other implementation, you can switch it out because it implements the same abstract class, and calls on it won't break the rest of your code
What an awesome explanation my friend, this is why I always think there is a lot of gold free content on internet, you just gotta find it
Wow. In just a few mins you clearly explained concepts that weren't clear to me. You're phenomenal. Thanks for this
Got much clearer undertstanding when and where to use Abstract and Interface. I never saw anyone explain this easy and quick. Would be happy to learn more concepts from your videos.
i have been trying to understand this for the past one hour and this 7 minute video made the concept crystal clear in my head thank you so much :)
You really have a knack of explaining seemingly complicated concepts easily. Thanks!
You explain things SO well. I keep turning to your videos instead of class lecture material to really understand these concepts. THANK YOU for doing this - it truly makes all of the difference. Seriously appreciate your videos and what you do.
I have seen many video tutorials about Java but none of them like yours could transmit the concepts so well! Thank you sooo much!!!
You are such a great teacher very simple and clear.
Wow. What a way to clear up the mess I had on my brain since long time. Now I can make my mind when to use what. Thanks a ton brother..!
It can't be explained better than this... you solved my headache in 7 minutes. Thanks so much.
This made me understand everything that's been missing from my course for the past 2 years. It'll help me greatly, thanks!
Thanks john. I was doubtful about this for years. Your crystal clear explanation made me understand this properly today ❤💯.
Gotta tell ya, now abstract classes and interfaces are beginning to make sense! Thanks, John! Really appreciate it!
This channel is such a bliss. Great content, and no useless wanderings on unrelated topics.
The tempo/pace of your uploads are really optimal. You keep it on point without getting into bunch of sidetracks. Those times I've wanted to quickly understand a topic and chose one of your videos, I've never felt restless because of slow talking or too much information and yet got a good understanding of the topic. Keep it up!
I Felt the exact same thing. I just wasn't sure how to express it and you are on point 💯
seriously this was one of the best java explanation videos I've ever seen. Thank you John!
Short and clear explanation - that's what a beginner needs. Thank you so much John!
This video is beautiful.. Please make a whole series on java programming and frameworks, it would have some of the less privileged ones to actually learn and do something on their own. Thanks :)
This was the best explanation I got for the difference between interfaces and abstract classes!! Really grateful for your amazing work!
Absolutely fantastic. This example will help shape your understanding of Abstract methods and Interfaces, how to implement an abstract method, the differences between abstract classes and interface, and it was all done in 7:00 minutes. Very clear, very easy to understand. Thank you!
This 7 minutes video is much better than the long 2 hours lecture
Really appreciate your comunnication skills and ur effort devoted on this video
Thanks for clarifying this! Best video on the subject that I can find!
Thanks John! I love your memorable examples and well explained "why"s, way easier to grasp these topics!
was confused in the class about this abstract and interface, now super clear! thank you so much
Needed clarification on whats the actual purpose of using an abstract class .Really simple and clear explanation for a beginner like me to follow . Thank you John !!
THANK YOU so much!! All your videos so far are simple & precise.
wow i really love how you explained the difference between a class and interface, really made it a lot simpler to understand compared to my current course in school, big thanks!
Thank you so muck for your lesson. I have stucked in a concept of abstract for so long. so now on I will consider using an abstract class in my project.
I've been looking for this explanation years. Now that I am learning backend stuff this concept is clear thanks to you.
When a 6min video is more efficient than an hour class of abstraction and interfaces 🙌 earned a sub brother appreciate the finals help 🙏
He really melted all my doubts about abstract classes and interfaces in only 7 minutes, that's masterclass explaining there
it took you 7 minutes including an introduction for the same content my teacher talked for hours( and I still wasn't sure what the hello was going on). Awesome, now I understand. Thank you.
Keep making these short videos really refreshes concepts and I don’t need to go back searching for things now.
Thankyou so much for helping me study for my java programming final exam !
Your ability to go into further detail and give extra examples as you did when mentioning interfaces is always brilliant.
I was looking for learning Java
This channel is like God sent !
Bless you !
Thank you John so much, I have sit in a 4 hour long lecture for these stuff but could not understand. With your explanation in 7 minutes, I totally get it. I wish the best for your channel. you have very practical example. I like it.
Really clear explanation about differences between abstract and interface. Thank you!
I loved how "easy" this was to process in my brain compared to hours upon hours of attempts to get it in my head during college. Thank you!
Hello John
Abstract Class is a flexible dynamic Interface and I can say it is a CONTRACT Statement that we NEED and Must enforce the client to apply for example.
Thank you so much for your clear video.
Allah bless you.
Regards
Something I often dislike about coding tutorials is that the obvious questions of why and how aren't addressed or beat around the bush on. Thank you for explicitly stating and answering all the doubts I had in mind. Appreciate it :)
Thanks you for taking the time and effort to make these tutorials!
Another coment.
Tbh i have never seen a better programming chanel in my whole live.
Explenations are always on point, I always get it straight away. We appreciate your work :)
This video is the easiest to understand and also conveys the most information at the same time. Great video.
Finally I'm able to understand the difference. Thank you John for your explanation. Greetings from Morocco
Thanks! This really cleared it up in my head, I was struggling to figure out why we would want to!
Well explained and super easy to follow.
Thanks John.
Very well thought. Watched many videos but got the exact explanation about the difference in your video. Thanks a lot
This was a great explanation. Short but still getting all the important points in. Thank you!
This video was so succinct, to the point, and helpful. Thank you! I know you made this video a year ago as of now and I imagine your videos have only gotten better and better, but I did want to offer one suggestion: I felt that several times during the video it was very hard to keep track of what you were talking about while you were jumping back and forth between class, interface, abstract class etc. I had to rewind video several times and pause just to think about the last thing you said. It could just be me! But as a beginner, I suggest you keep that in mind and try to slow down the jumping back and forth and explaining a little slower. I dont know how else to put it. Once again, fantastic video, and super informational! Even though I had to rewind parts, once it clicked and I went onward it just all made sense and there wasn't a lot of fluff.
The best and simplest explanation I've ever seen. Thank you.
no better way to explain it. Thank you so much John, highly appreciated.
I allways wathc spanish videos for programming, but in this case i'm amazed by your explainning form. Thanks for all your videos and for sharing all your knowlege in an easy way to understand.
Greetings from Argentina!
You are among the best teachers on UA-cam, good job and thank you for your lessons! ❤
Love it. I've been having a bit of trouble wrapping my head around this concept. Thanks a bunch!
Thanks a lot for sharing your knowledge.
I am still learning very important details from you after 20+ years of experience.
You are one of the best teachers out there on java.
Hats off to you sir.
I can feel the effort that was put into this video :)
I just watched a bunch of videos on this topic, but everything clicked for me after watching yours. Thank you!
John I am learning java and I am on an intermediate level but your videos always help. I wanted to make sure the things I knew about interfaces and abstract classes were right and now I'm sure more than ever. Thank you
This is perfectly explained, no wasted time. Top notch. Thank you !
"That might be the weirdest sentence ever said in a Java tutorial." well, that is clearly a statement, and a fact.
You seriously deserve more subscribers, your content is gold, I wish it existed when I was a student. Kudos
Much clearer than other videos. Thanks!
This class is absolutely nothing but clear and easy to understand .Thanks master!! From Japan who aim at being top level engineer in the future!!
I just found this guy and Oh my he is a Gem. His videos undoubtedly have the best, most precise, crisp information anyone will ever need. I spent hours trying to learn abstraction and polymorphism, while he did it in just 7 + 7 minutes. Can't stop stressing on how good his content is 💯
I just wanted to shout and rant angrily but actually that was the best explanation in 7 minutes. Clear and concise, thank you.
The final 2 minutes totally helped me get the whole concept, thanks for enlightening me :)
I have seen multiple videos on this topic and all of them were badly explained and confusing. Now I watched yours, and I am impressed how well you can explain stuff. Thank you.
amazing videos!! clear and easy explanation!! with code examples!!
I always have struggled with this concepts
thank you!!
Here I am, back on this video after viewing it a while back while in school. Just recently graduated and when John says it's a common interview question...it really is. I just had an interview and I was only able to explain an interface ☹️. Word to the wise, listen to John! ❤
Nice work!
Hey John. This is amazingly explained. Probably should be a introduction video to interfaces and abstract classes.
there's so many java tutorial but this is truly a gold mine
Simple, yet excellent explanation. Thanks!
just GREAT! Thank you for explaining things my profs make so complex , so EASY !
Thanks for the video. All the explanation of the all methods and classes are crystal clear and smooth.
I came upon this while learning through the MOOC course for Java and I was just dumbfounded cause I couldn't understand anything. So I looked for a supplemental video and went here first since you always explain concepts incredibly well. And wow abstract classes are cool. I literally had my mouth open while watching cause I was amazed by the concept lol
john i just want to seriously say thank you for saving me. my professor is so unclear, on top of a thick accent, and i struggle in the course due to those combined. i cannot say thank you enough
man - this dude explain in 5 minutes what my lecturer has been trying to do for 50, cheers!
Amazing, clear, and straight to point!
And this is also the best explanation on abstracts and interfaces. I’m reviewing java right now since I haven’t use that language in awhile lol
Another reason why you might want to have an abstract class is because you may need to store a generic ArrayList of the parent abstract class type, e.g. ArrayList where you can store any concrete subclasses in the same array. Excellent vid John!
John, thank you so much. It was soo hard for me to understand all the stuff about abstraction. You could explain me it in just 7 minutes 😢.And not only abstraction, all your videos are soo precious. I think you are the best tutor but so underestimated. Now I am going to buy your full course tutorial. Thank you so much ❤❤
That was an amazing explanation. Thank you John!
I have downloaded this video, I will listen to it at home i'm at work right now. This sounds amazing. thanks
Hey man, amazing video ! Exactly what I was looking for!
I was looking for abstract class vs interface , and this was exactly that. Even though you didn't mention "interface" in your video's title. Consider doing that maybe. YOUR EXAMPLES ARE REAALLY GREAT ! Carefully chosen to explain the core diferences. I don't recall anybody explained that better. I don't usually write comments on youtube, but you deserved it, my man!
This video is so clear and easy to understand, thank you!
Amazing. Finally understood the concept behind all that
I must say, you have a great way of explaining everything, you made it interesting. Thank you :D
That tutorial was soooo gooood , i saved in my playlist. Thanks John!!!!
This is great, simple and understandable. specially I think some what experience developers may know already about what is abstract class and what is interface, and if they like me they may use it in their day to day life. But most of the time it is hard to describe what is the difference and when should we use abstract class and when should be use interface. You cleard out the problem with very simple example that anyone can understand. Hats off and keep up the good work.
Our teacher has been explaining this concept for three lectures. Finally, she gave us a task related to these. Ofc, I didn't know anything so a friend shared this link and man God bless you because Holy, I get it now. Finally. Thankyou smmmmm.!
that's the best explanation i've ever seen on this topic
I can't believe that it has been 2yrs allready since u made this thank u so much ❤