Core Java Interview Questions & Answers | Top FAQs Explained! | @Javatechie

#JavaTechie #SpringBoot #InterviewTips #CoreJava

👉 In this comprehensive video, we dive deep into the world of Core Java by addressing some of the most commonly asked questions and providing clear and concise answers

⏰ Timestamps
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00:06 The pillar of OOPs concept includes encapsulation, inheritance, polymorphism, and abstraction.
02:53 This subpart explains encapsulation, inheritance, and polymorphism in Java.
07:51 Dynamic polymorphism allows multiple implementations of the inventory service
10:25 Overriding static and private methods is not allowed
15:33 Using default methods in Java interfaces for flexible implementation
17:51 Accessing parent property and overriding default methods
22:25 The finalize method is not called if the system GC is done.
24:35 Proper implementation of equals and hashCode methods is necessary to avoid duplicates in collections.
29:25 Compile time exceptions can be handled at compile time
31:51 FileNotFound exception is a checked exception and not a compile time exception.
36:30 Delegating exception handling to next method caller
38:29 Understanding the order of exception hierarchy is important while handling exceptions in Java.
42:48 finally block can be stopped from executing
45:10 String objects can be created using the new keyword or string literal
49:54 String is immutable
52:13 String class is immutable in Java
56:16 String buffer and StringBuilder are mutable, while String is immutable.
58:38 Creating an immutable class: Setter method write only getter method
1:03:23 Demonstrating how to avoid modifying a Date object in Java
1:05:48 Handling mutability in Java objects
1:10:42 Using the clone method to create a separate copy of an object.
1:12:58 It is recommended to use char array instead of String for storing passwords.
1:17:21 Writing custom marker interfaces in Java
1:19:18 The difference between AR list and linked list
1:23:23 Using generics with lists helps in avoiding type cast issues.
1:25:33 Creating a custom AR list to disallow duplicates
1:30:36 Set implementation allows duplicate objects if equals and hashCode methods are not overridden for custom objects.
1:32:58 The contract between equals and hashCode methods determines if duplicate objects are allowed
1:37:42 Sorting objects based on ID and name using Comparable and Comparator
1:40:22 Creating Comparators in Java for sorting objects based on different attributes.
1:45:56 Explanation of custom sorting using comparator
1:48:16 Fail-fast and fail-safe iterators in Java
1:52:42 ConcurrentHashMap is used when parallel thread access and modification is required.
1:54:42 ConcurrentHashMap does not allow adding null keys or values and throws a null pointer exception immediately.
1:58:58 ConcurrentHashMap uses segment locking or bucket locking
2:01:14 ConcurrentHashMap is preferred over Hashtable due to its locking mechanism.
2:05:46 Hing Collision
2:07:54 Hash map internally uses linked list nodes.
2:12:03 Understanding TreeMap in Java
2:14:50 The compareTo() method compares two objects and returns -1, 0, or 1 based on the comparison result.

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[s]

00:06 The pillar of OOPs concept includes encapsulation, inheritance, polymorphism, and abstraction.
02:53 This subpart explains encapsulation, inheritance, and polymorphism in Java.
07:51 Dynamic polymorphism allows multiple implementations of the inventory service
10:25 Overriding static and private methods is not allowed
15:33 Using default methods in Java interfaces for flexible implementation
17:51 Accessing parent property and overriding default methods
22:25 The finalize method is not called if the system GC is done.
24:35 Proper implementation of equals and hashCode methods is necessary to avoid duplicates in collections.
29:25 Compile time exceptions can be handled at compile time
31:51 FileNotFound exception is a checked exception and not a compile time exception.
36:30 Delegating exception handling to next method caller
38:29 Understanding the order of exception hierarchy is important while handling exceptions in Java.
42:48 finally block can be stopped from executing
45:10 String objects can be created using the new keyword or string literal
49:54 String is immutable
52:13 String class is immutable in Java
56:16 String buffer and StringBuilder are mutable, while String is immutable.
58:38 Creating an immutable class: Setter method write only getter method
1:03:23 Demonstrating how to avoid modifying a Date object in Java
1:05:48 Handling mutability in Java objects
1:10:42 Using the clone method to create a separate copy of an object.
1:12:58 It is recommended to use char array instead of String for storing passwords.
1:17:21 Writing custom marker interfaces in Java
1:19:18 The difference between AR list and linked list
1:23:23 Using generics with lists helps in avoiding type cast issues.
1:25:33 Creating a custom AR list to disallow duplicates
1:30:36 Set implementation allows duplicate objects if equals and hashCode methods are not overridden for custom objects.
1:32:58 The contract between equals and hashCode methods determines if duplicate objects are allowed
1:37:42 Sorting objects based on ID and name using Comparable and Comparator
1:40:22 Creating Comparators in Java for sorting objects based on different attributes.
1:45:56 Explanation of custom sorting using comparator
1:48:16 Fail-fast and fail-safe iterators in Java
1:52:42 ConcurrentHashMap is used when parallel thread access and modification is required.
1:54:42 ConcurrentHashMap does not allow adding null keys or values and throws a null pointer exception immediately.
1:58:58 ConcurrentHashMap uses segment locking or bucket locking
2:01:14 ConcurrentHashMap is preferred over Hashtable due to its locking mechanism.
2:05:46 Hing Collision
2:07:54 Hash map internally uses linked list nodes.
2:12:03 Understanding TreeMap in Java
2:14:50 The compareTo() method compares two objects and returns -1, 0, or 1 based on the comparison result.

[ozifwgw]

Must watch interview questions video for java developers. Everything is explained practically. Thanks a lot.

[neonew]

Thank you for great video. 99% teacher would cover these questions in 20 mins and most of us wouldn't understand anything and end up memorizing the answers. but you have properly explained each and every answer in great detail in 2 hours.

[faixan]

Such an awesome content and perfect timing. I was about to revise all the java basic to advance concept and here you go with the comprehensive and nice explanation of each n every concept. 🎉🎉

[SagarBisen-ktex]

Definitely a must watch video, thanks a lot.

[mayankmanral]

Most informative practical video of core java interviews

[vishnuvardhan]

This is very much needed video. Thankyou very much sir!!

[kamleshpatil]

Thank you for covering most of the topics...

[pbsbvfh]

Thank you so much for this content before interview, i go though this video mostly 90% are the same questions great work

[kumargagare]

What a timing man! This will really help me i. Preparation, thanks! Your content is very deep and practical!!

[Vithal_Nivargi]

Waw, awaited video.
Thank you so much 🙏❤

[gautamfitnesslook]

Thank you sir it's very helpful for beginner to experience person.

[sreerekhamenon]

Excellent content, thanks for providing them. Really helpful for interview preparation 🙂

[rohanchowdary]

these are the best interview questions on java

[Suraj-djrk]

Really very helpful bhaii.. thank you so much❤

[pavanik]

Because of break i don't have confidence but after watching this vedio slowly recovering 😊, thank you so much Basanth .

[bquvvbp]

Yes Basant. Cover With Scenario all topic

[fqxvfrl]

Hi Sir i really like the way you get into the topic in depth, can you please make videos on Data Structures with Java now every company is expecting to know in deep about this topic. I live in USA and this is one more nice video from you.. i generally wont write reviews for any videos but after watching yours couldn't able stop myself appreciating your hard work.. Keep up the great work Sir..

[udayagiriveeru]

Thanks a lot... I really appreciate your videos. Your lectures are useful for experienced candidates. Can help to share the questions PPT that would be very helpful.

[jagrutipatil]

As usual the bestest content we can found here☺️