java.util.Optional
Learn java.util.Optional: the null wrapper that makes absence explicit. Master map, flatMap, filter, orElse, and common anti-patterns.
Posts in technical
Variable Scope
Local, instance, and class-level variable scope in Java — where variables live, how long they persist, and what can access them.
Java Variables and Constants
Master Java variable declaration with var, final, and static final. Learn about scope, initialization, and when to use each modifier.
While and Do-While Loops in Java
Learn Java while and do-while loops: pre-test vs post-test iteration, infinite loops, loop termination strategies, and when to choose each loop type.
Wildcards in Java Generics
Use ?, ? extends T, and ? super T to master covariance and contravariance in Java method parameters.
Java Wrapper Classes
Master Java wrapper classes: Integer, Double, Boolean and more — immutable wrappers that add utility methods and null support to primitives.
JDK, JRE, and JVM
Clarify the distinction between JDK, JRE, and JVM — the three pillars of Java development and runtime environments.
Understanding the JVM
Explore how Java source code transforms into bytecode and executes on the Java Virtual Machine, including JIT compilation and memory management.
CPU Affinity & Real-Time Operating Systems
CPU affinity binds processes to specific cores for cache warmth and latency control. RTOS adds deterministic scheduling with bounded latency for industrial, medical, and automotive systems.
Fork & Exec System Calls
fork() duplicates a running process, then exec() replaces it with a new program. Together they power every shell, web server, and daemon on Unix-like systems.