ClassLoader
ClassLoader is a core component in Java and other JVM-based languages that dynamically loads Java classes into the Java Virtual Machine (JVM) at runtime. It is responsible for locating and reading class files, converting them into executable bytecode, and defining the class within the JVM. This mechanism enables features like dynamic class loading, modularity, and application isolation in Java applications.
Developers should learn ClassLoader when working on Java applications that require dynamic class loading, such as plugin architectures, application servers (e.g., Tomcat, JBoss), or frameworks like OSGi. It is essential for understanding classpath management, debugging class loading issues (e.g., ClassNotFoundException), and implementing custom class loading for scenarios like hot deployment or security sandboxing in enterprise Java systems.