Java Arrays & ArrayList Explained: Master Data Structures from Scratch 📚

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

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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