Class Loader
A class loader is a component of the Java Virtual Machine (JVM) responsible for dynamically loading Java classes into memory at runtime. It locates and reads class files, converts them into executable code, and manages class dependencies and namespaces. This mechanism enables features like dynamic class loading, modularity, and security in Java applications.
Developers should understand class loaders when building modular Java applications, frameworks, or libraries that require dynamic class loading, such as in application servers, plugin systems, or hot-swapping code. It's essential for debugging classpath issues, implementing custom class loading for isolation (e.g., in OSGi or web containers), and ensuring security by controlling class access.