Introduction to Arrays and ArrayList in Java

In this video we cover Arrays and ArrayList in Java from scratch. We dive deep into how it works, the memory management, input/output, multidimensional arrays, dynamic arrays, working with functions, and solve some questions. Take part in the learning in public initiative! Share your learnings on LinkedIn and Twitter with #DSAwithKunal & don't forget to tag us! 👉 Resources - Join Replit: http://join.replit.com/kunal-kushwaha - Complete Java DSA playlist: https://www.youtube.com/playlist?list=PL9gnSGHSqcnr_DxHsP7AW9ftq0AtAyYqJ - Code, Assignments, & Notes: https://github.com/kunal-kushwaha/DSA-Bootcamp-Java ➡️ Connect with me: https://www.techwithkunal.com ========================================= Timestamps: 0:00 Introduction ‌‍‍‍‌‌‍‍ ‌‍‍‌‌‌‌‍ ‌‍‍‌‍‍‌‍ ‌‍‍‌‍‌‍‌ ‌‍‍‌‍‍‍‌ ‌‌‍‍‌‌‌‌ ‌‌‍‍‍‌‌‌ 1:22 Why we need Arrays? 2:58 What is an Array? 3:13 Syntax of an Array 4:26 Direct hit Program : Store 5 Roll Numbers 6:44 How does Array works? 8:42 Internal Working of an Array 10:32 Dynamic Memory Allocation 12:00 Internal Representation of Array 13:06 Continuity of an Array 16:25 Index of an Array 19:53 String Array 20:42 What is null in Java? 23:30 null is used as a default 27:55 Array Input 31:19 for-each loop 33:15 toString() Method 34:52 Array of Objects 36:25 Storage of Objects in Heap 40:21 Array Passing in Function 42:32 Multidimensional Arrays 43:36 Syntax of a 2D Array 45:20 Internal Working of a 2D Array 50:16 2D Array Input 1:01:06 2D Array Output 1:07:05 Dynamic Arrays 1:17:22 Array Functions 1:21:08 Internal Working of ArrayList 1:33:21 Questions 1:33:30 Q1 : Swaping Values in an Array 1:35:20 Q2 : Maximum Value of an Array 1:40:45 Q3 : Reversing an Array 1:44:20 Outro #arrays #placement #dsa #interviews