BootSelf
Check my readiness
java

Data types and their sizes

2 roles need it, 2 as coreUsually level 3: WorkingLesson available

Where it sits

Learn first

Types and variables

This skill

Data types and their sizes

Leads to

Data types and variablesType casting

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

Data types and their sizes

Data types and variables

about 11 min15 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

Access modifiersArithmetic operationsArrayArray vs ArrayListArraysBasic SyntaxBasics of OOPBuild tools

Data types and their sizes: common questions

What is Data types and their sizes?

Data types and their sizes is a skill in java, needed by 2 roles on BootSelf.

Which jobs need Data types and their sizes?

Backend Developer (Java, Spring Boot), Full Stack Developer (Java + React). Most ask for level 3 (Working): uses it independently on the job.

What should I learn before Data types and their sizes?

Types and variables.

How long does it take to learn Data types and their sizes?

The starting lesson, Data types and their sizes, takes about 11 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 Data types and their sizes?

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.