BootSelf
Check my readiness
kotlin

Declaring classes

1 role need it, 1 as coreUsually level 3: WorkingLesson available

Where it sits

Learn first

String templates

This skill

Declaring classes

Leads to

Packages and importsCode DocumentationVisibility for classes, packages, and modulesThread as objectConstructors

Jobs that need it

What level 3 (Working) means

Uses it independently on the job. Level 4 (Strong): handles hard cases, reviews others.

Start learning

Declaring classes

Object-oriented programming basic

about 10 min8 parts

Open the lesson

Find out where you stand

A free check, then a route that starts at your level.

Check my readiness

Learned alongside it

Abstract classesAdditional librariesAggregate operations on collectionsAggregate operations on collections: part 2AndroidAndroid CoreAndroid JetpackAndroid studio basics

Declaring classes: common questions

What is Declaring classes?

Declaring classes is a skill in kotlin, needed by 1 role on BootSelf.

Which jobs need Declaring classes?

Android Developer. Most ask for level 3 (Working): uses it independently on the job.

What should I learn before Declaring classes?

String templates.

How long does it take to learn Declaring classes?

The starting lesson, Declaring classes, takes about 10 minutes. Reaching the level a job asks for takes practice on top: BootSelf measures where you are and plans the rest.

How do I practise Declaring classes?

Check your readiness for free, then BootSelf builds a route and short daily learning loops: a little theory, checks on what you get wrong, then a small program.