Java Classes and Objects: OOP From Scratch
Design Java classes that hold state and behavior cleanly. Constructors, encapsulation, static vs instance, records, and the equals plus hashCode contract.
·5 min read · #java#oop#beginner
#java
10 posts.
Java Collections Framework: List, Set, Map
Pick the right Java collection by performance and semantics. ArrayList vs LinkedList, HashMap vs TreeMap, immutability, and iteration without surprises.
·5 min read · #java#collections#intermediate
Java Control Flow: if, for, while, switch
Every branching and looping construct in modern Java, including switch expressions and pattern matching, with examples that mirror real code.
·5 min read · #java#control-flow#beginner
Java Exceptions: Checked, Unchecked, and Best Practices
Throw, catch, and chain exceptions without leaking abstractions. Checked vs unchecked, try with resources, custom exceptions, and rules that scale.
·5 min read · #java#exceptions#intermediate
Java Generics: Type Parameters Done Right
Write Java generics that compile and read well. Type parameters, bounded wildcards, PECS, type erasure, and how to avoid raw types in your own code.
·5 min read · #java#generics#intermediate
Java Inheritance and Polymorphism
Use extends, super, and method overriding without painting yourself into a corner. When to inherit, when to compose, and how sealed types help.
·5 min read · #java#oop#intermediate
Install Java and Write Your First Program
Install a modern JDK, verify the toolchain, and ship your first Java program from the command line without an IDE doing the magic for you.
·4 min read · #java#setup#beginner
Java Interfaces vs Abstract Classes
Choose between interfaces and abstract classes with confidence. Default methods, sealed interfaces, functional interfaces, and concrete decision rules.
·5 min read · #java#oop#intermediate
Java Streams and Lambdas: Functional Style on the JVM
Transform collections with lambdas and the Stream API. Map, filter, reduce, collectors, parallel streams, and the pitfalls of lazy pipelines.
·5 min read · #java#streams#intermediate
Java Variables and Primitive Types
Master Java primitives, reference types, literals, and casting. Know exactly what each type costs and where overflow and precision will bite you.
·5 min read · #java#types#beginner