Java8 ||Anonymous Inner Class vs Lambda Expressions || Session - 4 || On 03-08-2018 by Durga Sir

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21:35 -> Anonymous Inner Classes Vs Lambda Expression

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Thanks for such clear explanation

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[@sachinkumarsingh538]

sir u didn't mention that its better to use lambda expression as compared to anonymous class in case of functional interface as it won't create an extra dot class

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Excellent Content.

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[@tvlogs7441]

Dear Durga Sir, what is the issue with this
// Functional interface for adding two numbers
interface AddNumbers {
int add(int a, int b);
}
public class LambdaDemo {
public static void main(String[] args) {
Thread a = new Thread() {
public void run() {
// TODO: Actual code to be executed in the thread
}
};
AddNumbers addNumbers2 = new AddNumbers() {
@Override
public int add(int a, int b) {
return a + b;
}
};
AddNumbers addNumbers = (a, b) -> a + b;
}
}
error :Lambda expression's parameter a cannot redeclare another local variable defined in an enclosing scope. This happens If I am creating a Thread class object as anonymous . Please explain . Durga Sir only can explain the concept here

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[@vivekhaarit]

someone please help....
at 15:21 Collections.sort( l, (e1,e2)->(e1.enoe2.eno ? 1 : 0)
my doubt is that.. how the "int comparator(T a, T b);" is knowing the type of e1,e2 you didn't declare their types anywhere.
in your previous videos you had used
Comparator c = (e1,e2) -> (e1.enoe2.eno ? 1 : 0) so it was clear that e1,e2 will be treated as objects of Employee class.

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[@patrisagar6548]

50:48 only 1st option correct

[@tapanjeetroy8266]

Thanks sir

[@narendra9903]

At 18:00 you have used sort method with lambda expression for employee objects.but Employee does not implement Comparator.How is sort method accepting this?

[@jvsnyc]

Classes do not need to implement Comparator for themselves. Comparable interface is for the class to implement to define a natural sorting order for objects of that class. Any number of Comparator classes can be defined to do custom sort orders for a class of objects. This is fundamental difference between Comparable and Comparator, which is a common interview question and a source of tricky questions on the OCJP exams.

[@hemanthkumarboyina6188]

I sir.. Please do the vedio on Java 8 Streams and other features

[@alohadev4541]

Hello sir, where I can find the notes for all video lectures. Thanks you.

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@@DurgaSoftwareSolutions Yes sure sir, and thank you for all your efforts you are simply awesome.

[@lijomonjose1646]

superb sir

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[@devendrajoglekar2406]

i am facing error at e1.name is
cannot find symbol
symbol: variable name
location: variable e1 of type Object

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[@sarangkumar3803]

You have to typecast it as name variable is not present in object class

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Hello Durga Sir,
When will you start with the competitive programming concepts?

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[@balu0289]

Comparator has two methods compare() and equals() and both are abstract methods, then how come we call it as functional interface and implement lambda expression on it. Please clarify. Thanks

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[@sarangkumar3803]

equals() method is already implemented in Object class .

[@Swethareddy2803]

Without giving comparator...how can we pass the variables ..how it knows which interface it is calling !!

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[@navkantsingh7517]

owsm explanation sir

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[@tharsantharsan416]

is lambda expression method returns or creates new object(in it's FI type) ??

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[@anishagupta1504]

interfaces don't have objects ig

[@rajatgoyal8205]

Can we create anonymous class for the class which is final

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[@sreeramraghava6750]

Anonymous is power full than Lamda Expression. But can I know What is reason to provide lambda expression in Java 1.8 ?

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[@SuprajaYKM]

How to sort alphabetically in descending order?

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[@ahmidahmid9303]

Collections.sort(list l,(s,s2)->s2.compareTo(s2));

[@mugundanvicky6468]

in emplyoee example.....we dont need to create functional interface reference..?? like this Comparator c=(e1,e2)->(e1.enoe2.eno?1:0).......

[@speedayon1]

This is great. do u have any course on CICD?

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[@jvsnyc]

If lambda expression contains only one argument AND WE DO NOT WANT TO DECLARE ITS TYPE then parenthesis are optional.

[@Code_JAVA268]

prooooo

[@sarangkumar3803]

import java.util.*;
class Employee implements Comparable
{
String name;
Integer eno;
Employee(String name, Integer eno){
this.name = name;
this.eno = eno;
}
//DOUBT, HOW TO MAKE COMPILER AWARE THAT compareTo() METHOD IS IMPLEMENTED BELOW.? RIGHT NOW IT GIVES COMPILE TIME ERROR.
Comparable c = base -> -this.eno.compareTo(base.eno);

public String toString(){
return this.name + " " + this.eno;
}

}

[@veerendrak1001]

Any one have java 8 and java9

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3. Java 9 New Features In Simple Way : JShell, JPMS and More
Link: goo.gl/s9PP1p
4. Complete JDBC Programming Part-1
Link: goo.gl/uT9sav
5. Complete JDBC Programming Part-2
Link: goo.gl/VmhM7t
Regards
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