Introduction to Arrays and ArrayList in Java

This course introduces arrays and ArrayList in Java, covering their internal representation, memory allocation, input and output, multidimensional arrays, and array operations through examples and practice questions.

Syllabus

Introduction ‌‍‍‍‌‌‍‍ ‌‍‍‌‌‌‌‍ ‌‍‍‌‍‍‌‍ ‌‍‍‌‍‌‍‌ ‌‍‍‌‍‍‍‌ ‌‌‍‍‌‌‌‌ ‌‌‍‍‍‌‌‌
Why we need Arrays?
What is an Array?
Syntax of an Array
Direct hit Program : Store 5 Roll Numbers
How does Array works?
Internal Working of an Array
Dynamic Memory Allocation
Internal Representation of Array
Continuity of an Array
Index of an Array
String Array
What is null in Java?
null is used as a default
Array Input
for-each loop
toString Method
Array of Objects
Storage of Objects in Heap
Array Passing in Function
Multidimensional Arrays
Syntax of a 2D Array
Internal Working of a 2D Array
2D Array Input
2D Array Output
Dynamic Arrays
Array Functions
Internal Working of ArrayList
Questions
Q1 : Swaping Values in an Array
Q2 : Maximum Value of an Array
Q3 : Reversing an Array
Outro