Sealed Classes in Java | Java 17 features
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Teach DSA in java sir!!!
Hey Navin, please teach us DSA with Java
yeaaaaaaaaah we need it, from this awesome teacher 😍😍😍😍
Easy to understand the tutorial by your way of teaching the concepts...Thanks Navin reddy sir...
Enthusiastic to learn more from you...
Great!!! Waiting for more new features videos. 😊
Sir, it was awesome. In a video of 9 mins I got to know inheritance with classes and interfaces then with associated keywords. Oh I forgot to mention one thing " with practical implementation "
Nice teaching method over traditional tutorials where the tutor simply writes the correct code and then explains it. I like how you write the code, show errors, and then correct them, as it helps solidify the concepts in the viewer's mind.
Great Explanations.
Your classes are awesome 😎
Thank you. It is very useful
Sir,your all videos are very helpful....you give as latest updates also
Thank you Sir for another useful video 😊👍
I was trying to relate this to a real-time example, couldn't come up with one. Any example which can be suitable for sealed classes?
thanks for this new lessons sir
So easy explanation 😊
Hi, could you please make a video compiling all the added features from java 7 onwards.
Informative video.
Thank you so much sir...and i am waiting for your new videos and plz make a video for DSA of java.
Great lecture as always!In my opinion, I think real world usage might result in lengthy class signatures that are difficult to read and take longer to comprehend.
Encapsulation might also be violated as class signature might instantly give away sensitive information about parent classes or subclasses. Who else thinks differently?
Seald class looks good concept
Are sealed classes generally used for Security in Java? If so what are the main use cases?
Hi Navin, I observed, A permits B which is non-sealed. Now, D is able to extend B, so, ideally D is able to extend A through non-sealed B. Should that be allowed as A is only permitting B and not D ?
Hi sir
I created small website with jsp, jdbc, mysql. Sir how to create reward points like add 5 points when user sign up in my website, add 2 points when user login in website.
Thnxs
amazing
Sir today doubt session will live???
Please create separate playlist for java Design patterns
Sir please make a tutorial on data science
Sir if i watched your channel top to bottom , am programmer ah Sir. 😎 (Reply pannunga Sir)
Sir please provide a sample program on sealed classes with complete execution
Sir Java 17 ki alag se playlist bana do
Kotlin :)
Sealed Classes in Java. Feature of Java 15 not Java 17 @Navin sir
@Telusko pleaaaaaaaaaaaaaase we DSA in JAVA from you, thanks a lot ❤❤❤❤❤❤❤❤
Hara Hara mahadeva
First with 100 people
Sealed class Notes :
Eg#1
sealed class A permits B,C
{
}
/*
C:\Users\Shiva Srivastava\Desktop\Programming>javac Main.java
Main.java:5: error: sealed, non-sealed or final modifiers expected
class B extends A
^
Main.java:9: error: sealed, non-sealed or final modifiers expected
class C extends A
^
2 errors
*/
//without mentioninng sealed , non-sealed or final you cannnot extends sealed class
final class B extends A
{
}
final class C extends A
{
}
//class D cannot inherit A but B and C and inheirt
class D extends A//if you are inheriting A you get compile time error
{
/*
C:\Users\Shiva Srivastava\Desktop\Programming>javac Main.java
Main.java:27: error: class is not allowed to extend sealed class: A (as it is not listed in its permits clause)
class D extends A//if you are inheriting A you get compile time error
^
1 error
*/
}
class Main
{
public static void main(String []args)
{
System.out.println("shiva");
}
}
eg#2
sealed class A permits B,C
{
}
/*
C:\Users\Shiva Srivastava\Desktop\Programming>javac Main.java
Main.java:5: error: sealed, non-sealed or final modifiers expected
class B extends A
^
Main.java:9: error: sealed, non-sealed or final modifiers expected
class C extends A
^
2 errors
*/
//without mentioninng sealed , non-sealed or final you cannnot extends sealed class
sealed class B extends A permits D
{
}
final class C extends A
{
}
final class D extends B// B you can inherit D by making d as sealed or non-sealed
{
}
class Main
{
public static void main(String []args)
{
System.out.println("shiva");
}
}
eg#3
sealed class A permits B,C
{
}
/*
C:\Users\Shiva Srivastava\Desktop\Programming>javac Main.java
Main.java:5: error: sealed, non-sealed or final modifiers expected
class B extends A
^
Main.java:9: error: sealed, non-sealed or final modifiers expected
class C extends A
^
2 errors
*/
//without mentioninng sealed , non-sealed or final you cannnot extends sealed class
non-sealed class B extends A
{
}
final class C extends A
{
}
class D extends B// B you can inherit D by making d as sealed or non-sealed
{
}
class Main
{
public static void main(String []args)
{
System.out.println("shiva");
}
}