JVM: The Foundation of Java Memory Management
Before we dive into memory management in Java, it’s important to understand what the JVM is , how it works , and what happens internally when a Java program runs. This knowledge directly improves your debugging, performance tuning, and overall coding efficiency. What is the Java Virtual Machine (JVM)? The Java Virtual Machine is the engine that runs Java applications. But it doesn’t execute .java files directly. You write Java code → .java The compiler ( javac ) compiles it to bytecode → .class The JVM reads and executes this platform-independent bytecode . This is what enables Java’s famous mantra: Write once, run anywhere. Any device with a JVM — Windows, Linux, macOS — can run the same .class file. Key Components of the JVM The JVM has three major components that work together to run your code: 1. Class Loader Loads .class files into memory. Handles linking, verifying, and initializing classes. Ensures static variables & static blocks run c...