GuideTechnology
11 min read
How one Java class can build on another, how overriding changes behaviour at runtime, how overloading is chosen at compile time, and why inheritance is easy to misuse. With the constructor-order trap, field hiding and the exact differences interviewers ask about.
GuideTechnology
12 min read
Why object-oriented programming exists and how Java expresses it: classes as blueprints, objects as instances, constructors, access modifiers, static versus instance members, and encapsulation as a way to protect the rules of your data. Built around a bank account that cannot go wrong.
GuideTechnology
13 min read
How to make a Java program choose and repeat: if, switch (old statement and modern expression), the loop forms, and how to organise code into methods. Includes the pass-by-value rule that interviewers love and the scope rules that cause mysterious compile errors.
GuideTechnology
15 min read
How Java stores and combines data: primitive types versus references, what happens when a number overflows, why integer division surprises people, how casting and conversion work, when to use var, and how arrays hold a fixed number of values.
GuideTechnology
15 min read
What Java actually is, how a .java file becomes a running program, what the JDK, JRE and JVM each do, and how to compile and run your first program. Plus the full roadmap of this 41-article course, from zero to a tested Spring Boot API.
CourseTechnology
A free 41-article course that takes you from your first Java program to a tested, secured Spring Boot and PostgreSQL backend, with three projects, real verified output and interview preparation. Modern Java 21 and later, with older styles labelled.
