Java 8 Predicate, Function, Chaining, Predicate Joining interview questions (Live Demo) Code Decode

In this video of code decode we have covered Java 8 || Predicate || Function || Chaining || Predicate Joining interview questions (Live Demo)
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here are lots of new features which were added in Java 8. Here is the list of important features which are mostly asked as java 8 interview questions:
Lambda Expression
Stream API
Default methods in the interface
Predicate
Functional Interface
Optional
Method references
Date API
Nashorn, JavaScript Engine
Main advantages of using Java 8?
More compact code
Less boiler plate code
More readable and reusable code
More testable code
Parallel operations
Q) What are predicates?
Predicate is a predefined Functional Interface (Having only 1 abstract method).
The only abstract method of predicate is test(T t):
public boolean test(T t);
Whenever we want to check some boolean condition then you can go for Predicates.
Q) How to use Predicates?
Say if you need to test if the length of the given string is greater than or equal to 5. Then in such situations where you need to test conditions, use test() method of predicate.
Q) Type parameter and return types of Predicates?
Input to predicate can be anything like
Hence only 1 type argument is required which is input type in predicate.
Return type is not required as its always Boolean only.
Q) Advantages of Predicates?
Code Reusability
If you have same conditions being used 100 times in a prgram then you can write once and just use 100 times with checkLength.test(different string to be tested).
Conditional checks are holded by Functional interfaces.
Q) What is Predicate joining?
You can combine predicates in serial predicate
Three ways to join :
And
Or
Negate
Eg if you want to test 2 conditions:
To check length of string
To check if length is even.
Q) What are Functions
Function is also a predefined Functional Interface (Having only 1 abstract method).
The only abstract method of Function is apply(T t);
R apply(T t);
Given some input perform some operation on input and then produce / return result (not necessary a boolean value).
This takes 1 input and returns one output.
In predicate we used to take 1 input and return type is always boolean.
In function return type is not fixed hence we declare both input type and return type.
Q) What is Functional chaining
We can combine / chain multiple functions together with andThen .
There are two ways to combine functions:
f1.andThen(f2).apply(Input); - first f1 then f2
f1.compose(f2).apply(Input) - first f2 then f1
Multiple functions can be chained together like :
f1.andThen(f2).andThen(f3).andThen(f4).apply(Inputs);
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This channel provides a better Explanation than courses available on PluralSight. Thanks for video

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[@shubhisharma3790]

Earlier when i tried to learn predicate and functions it looks very complicated to me, but after watching your tutorial it looks to be simple thing. Your way of explaining it awesome.

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Very useful video to understand about predicate and function 👍

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Appreciate your Great efforts in providing very useful topics. looking forward to seeing other topics as well like collections, threads,spring and rest

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Thanks for the kind words. Please check out collection and spring video on our channel. It is already there.

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Hi code decode it's so nice to see all videos at one place with clear explanation while preparing for interview, can you please share the PPT which you are explaining in this series.

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Very good explanation best channel to preparing for interview . Thank you

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[@karthikeyanu2115]

Helps to understand easily and expecting a video on other functional interfaces soon Thanks

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Clear explanation with example. way to go

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The best explanations... keep posting it

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Very Useful..thanks..

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Good knowledge pls upload further videos. Really thanks a lot

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Sure will upload soon 👍

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Your explanation is really superb. Ton of thanks whole heartedly 🥳🤝💐

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[@AbhishekVerma-zg4ov]

Best video that I've come across for Predicate, Function, Consumer, Supplier, BiXXX. Before this never really understood the concept

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you are amazing mam....plz keep flowing such knowledge with us..

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Than you so much. Your videos are very helpful to remember easily. with in short time you are giving more content, I am very interesting to watch this videos. Kindly made videos for the remaining topics in java 8.

[@CodeDecode]

it's almost ready. will upload very soon 👍

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really each and every video is full of information and delievered very simple way and could you please upload all souce code for more clarity for the user, all the very best ...keep doing this..thank you

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[@CodeDecode]

Thanks 🙏🙏👍

[@kishoredanti5769]

All your videos are really helpful to understand and remember the Java concepts & to prepare for the interviews. Please do Part 4 of this & a video on Spring Boot Microservices concepts🙏

[@CodeDecode]

Thanks 👍. Part 4 is almost ready. Will upload that soon

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Amazing explanation

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Thanks

[@mytechnologies3448]

Nice contents usual :) but still, we need a lot of interview questions related to Java 8. Thank you so much :)

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You will get next video very soon it's almost ready.

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Perfect content.. Please upload on further topics.

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Sure will upload them soon 👍

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Great effort Mam

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Sure Lokesh you will see more videos on channel 😀

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Yes please create playlist for understanding

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Very well explained !

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Thanks

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please do video on consumer chaining .......... .u r helping a lot.... madam g ... u r great for that much of patience and hats off to u for knowledge

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Really Helpful

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great videos!!

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Thanks

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Thanks for the nice Explanation!!! Please upload Streams concept as early as possible.

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It's already upload. 😊

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It's in same playlist. Please let me know you don't find it.

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Please upload react n angular questions also... Thank u so much.. Ur way of teaching is incredible... Keep up...

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Sure. Will upload them soon 👍👍

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Very nice....

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very clear explanation

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Thanks ....

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Very useful and crystal clear explanation.Thank you very much for your videos. Can you please explain about the chaining in BiXXX functional interfaces if it's possible in java?

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Thanks!

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Thanks for the support

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Another awsome video. Can you please cover microservices with new spring cloud version avoiding any depricated dependencies . Like explain spring cloud gateway instead of zuul and resilience4J instead of hystrix etc.

[@vab8703]

At 1:53 testStringLength(String s) can/should be replaced with just one return statement as follows: boolean testStringLength(String s) { return s.length() >= 5; }

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Your playlist is life saving mam, Thanks for your details explanation can i get that ppt from which you are teaching it will be huge help thanks

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your video is awesome

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Thanks Ravi 😊👍

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grate one

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Thanks Tushaar 🙂🙂

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I have cracked many interviews under your guidance, Can you plan a book or PDF document for Java interviews, It will be really useful...Thank you for sharing your knowledge.

[@shreyasoni6223]

Very nice explanation , can there be a combo of andThen() and compose() in functional chaining ?

[@wmv1990]

Excellent video! Thank You. On 9:28 please can you show the example of how to do code reusablity, as what I understand is we can not pass arguments in Method Reference way, so how can we reuse code when we can not pass argument in this case ?

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thanks for this topic

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👍

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Watched Pluralsight and other good youtuber videos on java 8 but never explained as clearly as you, I used to tell in interview that i donot know java 8

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Thanks Rahul🙂

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Hi Mam, All videos are so clear and very well explained... thank you ! But my only suggestion is please keep your phone in silent mode not vibration mode.. vibrations in the middle of video really annoying.

[@CodeDecode]

Yes Shruthi. We understand. Actually we just shoot, may be in multiple takes. Single shot video is not practically possible bcz after 15 minutes of continues speaking, we need gulp of water or sometimes sneeze or something disrupts the video. So many a times we miss to silent the phone and shoot back. That's why sometimes this happens. Sorry for the disturbance. Thanks for letting us know and bringing this issue to our notice 🙏

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@Code Decode... Please create a video explaining Java Generics taking some examples of method suggestions that pop up on IDEs, and how to understand there requirements from Generics perspective. for e.g. obj. {suggestion list : " forEach(Consumer

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Very good lecture

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Thanks 👍

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Hi, You are awesome while describing any thing with code, I am following this channel since long, Do we have a repos for this or all the videos you have?

[@CodeDecode]

🙂 sure will search 🙂🙂

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Very clear and simple explanation thanks a lot. Where & how can we download materials or code samples

[@doddakadinesh8114]

can you please make a tutorial video on this in built functional interfaces topics as well as streams

[@yogaprakash5356]

Nice

[@CodeDecode]

Thanks and All the best for the interviews

[@aditisingh6330]

Hi Code Decode , Can you please make java series on predicting output type interview questions? It will be very very helpful in real time interviews.

[@priyankachougule4334]

Have you explained Generics in any video? Could you please upload if not present? Thanks a ton for all the videos. You are a lifesaver for java interview questions.

[@CodeDecode]

Sure we will create one Priyanka🙂👍. Thanks

[@deepashreegs1310]

please provide PPT and demos used so that we can brush up quickly before going to interview. Thanks!!

[@sinun1466]

Please do a video on consumer and supplier with more examples and a video on parallel processing of streams will also be helpful. Thank you

[@CodeDecode]

Will upload this soon. It's almost complete.

[@sinun1466]

@@CodeDecode thanks

[@CodeDecode]

👍

[@amarthyaseshu683]

Thanks for sharing!. Can u also upload more parts with the remaining concepts of J8

[@CodeDecode]

Next video is almost ready it is scheduled for Tuesday morning. Stay tuned for it.

[@krishnamsr]

Really useful helps in quick learning of the concepts in detail. Thank you, can you Please make video of design patterns with real time examples.Also can please make videos on JDK 1.11

[@CodeDecode]

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[@CodeDecode]

Thanks Krishna 👍👍

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@@CodeDecode Thank you and looking out for JDk1.11 features please..

[@CodeDecode]

Sure, wr will create seperate video on that👍👍

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Awesome

[@CodeDecode]

Thanks 👍

[@start1learn-n171]

Tq

[@CodeDecode]

😊 your welcome!!

[@012345678912345127]

Really nice, tq for sharing awesome knowledge...and can you please share code and relevant information data..

[@CodeDecode]

Will upload this on git and will give you the link to clone soon 👍

[@012345678912345127]

@@CodeDecode ok tq.. Plz share link......

[@CodeDecode]

Hi, Below is the git link. Please let me know if you are able to clone and get the code base for reference. [e-mail]:codedecode25/Java-8-demos.git or github.com/codedecode25/Java-8-demos.git

[@jayeshamodkar7951]

Hi, Thank you for such informative videos. Can you please tell us from where we can get this ppt's which you have prepared. Thanks in advance.

[@CodeDecode]

Hi Jayesh, it's just a random points that I add to ppt for my reference so that I don't forget what I need to teach in that session . It's just rough points.

[@lakshmicherukuri3238]

Do you have the pdf for your explanation. Your explanation is awesome.

[@jeetusonar]

Hello mam, Please start web services and spring framework interview questions.

[@CodeDecode]

Sure. We do have spring boot playlist. please do check that too. 👍

[@nishabansal9151]

Please upload seperate video on remaining topics also of consumer, supplier and Bi****

[@CodeDecode]

It's almost ready, will upload that soon 👍👍

[@prashusaxena1023]

Do we have a github repo link as a reference code of these tutorials

[@tubepankajyou]

You explained it very well... Could you please share Angular knowledge also if possible?

[@CodeDecode]

kzbin.info/aero/PLyHJZXNdCXsfxRtDwtGkDD_lLfTWc1g0i

[@CodeDecode]

Here is what you need Pankaj 👍

[@tubepankajyou]

@@CodeDecode Thankyou :)

[@Preethipree1]

Hi. It's very much clearer. Thanks a lot! 1 question. May I know andThen vs compose? Logically both are same right. We can achieve compose by changing the function order. May I know the differences?? You are making everything is simple and clear. Could you please explain about Wrapper classes. Even though it's simple I'm struggling to explain when interviewer asks. Also please explain about Spring MVC.

[@CodeDecode]

Yes Preethi, they are logically same 🙂👍. Sure we will cover wrappers and MVC 👍

[@Preethipree1]

@@CodeDecode Wow Thank you! I'm waiting.

[@CodeDecode]

@@Preethipree1 👍🙂

[@sreeram543]

Awesome ...please make consumer and supplier concept also

[@CodeDecode]

It's already available on the playlist👍👍

[@sreeram543]

@@CodeDecode yaa part 4 saw it after posted

[@sreeram543]

@@CodeDecode and also i started ur videos since saturday and finished all except garbage collection .. please upload more and more videos

[@palanesami]

Can you please share any ppt with code snippets.it will be very useful to revise

[@vishalbharat2801]

hi . can you please create video on collections with the same way which you created for java 8 features like wise concept with example pointing to interview questions . thanks

[@CodeDecode]

We already have a video on that : kzbin.info/www/bejne/gZfSf4yli7p1gKs

[@adityajasood4891]

can anyone please explain this Write a Java program to display those starting with A and having length of 3 characters in java8. given string array. i tried to use filter and store it in two different list based on different condition, then was function chaining required? I was not able to complete this

[@manojpatil2457]

Hello,thanks for all these videos. Do you already work in IT?

[@CodeDecode]

Yes Manoj, we all are working IT professionals working with mncs with work experience ranging from 6 to 10 years

[@manojpatil2457]

@@CodeDecode Thanks again....