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 --------------------------- 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. Spring boot microservice Premium course lunched with 70% off 🚀 🚀 Hurry-up & 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/Java-Techie-jt 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 above-mentioned GitHub account.