Issues

Iterator & enhanced collection traversal patterns

Sip21/whatsup21#43 · opened

on Apr 20, 2026

Lambda expressions & functional interfaces basics

Sip21/whatsup21#42 · opened

on Apr 20, 2026

Enums — define constants, use in switch, add methods

Sip21/whatsup21#41 · opened

on Apr 20, 2026

File I/O — read and write text files using FileWriter & Scanner

Sip21/whatsup21#40 · opened

on Apr 20, 2026

Exception handling — try, catch, finally, throw, throws

Sip21/whatsup21#39 · opened

on Apr 20, 2026

Static keyword — static fields, methods, and utility classes

Sip21/whatsup21#38 · opened

on Apr 20, 2026

Polymorphism — runtime & compile-time with practical demo

Sip21/whatsup21#37 · opened

on Apr 20, 2026

Abstract classes & abstract methods

Sip21/whatsup21#35 · opened

on Apr 20, 2026

Inheritance — extends keyword, parent-child class relationship

Sip21/whatsup21#33 · opened

on Apr 20, 2026

Encapsulation — private fields, public getters & setters

Sip21/whatsup21#31 · opened

on Apr 20, 2026

Constructors — default, parameterised, this keyword

Sip21/whatsup21#30 · opened

on Apr 20, 2026

Classes & Objects — blueprint concept, creating instances

Sip21/whatsup21#29 · opened

on Apr 20, 2026

HashSet — uniqueness, add, contains, iteration

Sip21/whatsup21#28 · opened

on Apr 20, 2026

HashMap — put, get, containsKey, iteration over entries

Sip21/whatsup21#27 · opened

on Apr 20, 2026

LinkedList — add, remove, peek, poll operations

Sip21/whatsup21#26 · opened

on Apr 20, 2026

ArrayList — add, remove, get, size, iteration

Sip21/whatsup21#25 · opened

on Apr 20, 2026

2D Arrays — matrix representation and traversal

Sip21/whatsup21#24 · opened

on Apr 20, 2026

1D Arrays — declare, initialise, iterate with loops

Sip21/whatsup21#23 · opened

on Apr 20, 2026

Recursion — factorial & Fibonacci with recursive methods

Sip21/whatsup21#22 · opened

on Apr 20, 2026

Method overloading — same name, different parameters

Sip21/whatsup21#20 · opened

on Apr 20, 2026

Defining & calling methods — parameters, return types, void

Sip21/whatsup21#19 · opened

on Apr 20, 2026

Nested loops — multiplication table exercise

Sip21/whatsup21#18 · opened

on Apr 20, 2026

For loop & enhanced for-each loop

Sip21/whatsup21#17 · opened

on Apr 20, 2026

Ternary operator — shorthand if/else

Sip21/whatsup21#15 · opened

on Apr 20, 2026

Switch statement & switch expressions (Java 14+)

Sip21/whatsup21#14 · opened

on Apr 20, 2026

Navigation Menu

Repository navigation

Issues

Iterator & enhanced collection traversal patterns

Lambda expressions & functional interfaces basics

Enums — define constants, use in switch, add methods

File I/O — read and write text files using FileWriter & Scanner

Exception handling — try, catch, finally, throw, throws

Static keyword — static fields, methods, and utility classes

Polymorphism — runtime & compile-time with practical demo

Abstract classes & abstract methods

Inheritance — extends keyword, parent-child class relationship

Encapsulation — private fields, public getters & setters

Constructors — default, parameterised, this keyword

Classes & Objects — blueprint concept, creating instances

HashSet — uniqueness, add, contains, iteration

HashMap — put, get, containsKey, iteration over entries

LinkedList — add, remove, peek, poll operations

ArrayList — add, remove, get, size, iteration

2D Arrays — matrix representation and traversal

1D Arrays — declare, initialise, iterate with loops

Recursion — factorial & Fibonacci with recursive methods

Method overloading — same name, different parameters

Defining & calling methods — parameters, return types, void

Nested loops — multiplication table exercise

For loop & enhanced for-each loop

Ternary operator — shorthand if/else

Switch statement & switch expressions (Java 14+)