#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

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 Failfast and failsafe 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.

Spring boot microservice Premium course lunched with 70% off

Hurryup & Register today itself!

COURSE LINK : https://javatechie5246.ongraphy.com/
PROMO CODE : JAVATECHIE50

OR use Javatechie APP

Download the JavaTechie app on your iOS or Android device from the App Store or Google Play Store.

Find the links below :

Android :
https://play.google.com/store/apps/de...

IOS :
https://apps.apple.com/in/app/javatec...

GitHub:
https://github.com/JavaTechiejt

Blogs:
  / javatechie4u  

Facebook:
  / javatechie  

Join this channel to get access to perks:
https://www.youtube.com/javatechie/join

Guys, if you like this video, please do subscribe now and press the bell icon to not miss any update from Java Techie.

Disclaimer/Policy:
Note: All uploaded content in this channel is mine and it's not copied from any community, you are free to use source code from the abovementioned GitHub account.