<ul data-eligibleForWebStory="true">Java class files are the bytecode representation of Java programs, crucial for the JVM.The Class-File API allows for programmatically generating, inspecting, and transforming class files.It includes components like ClassBuilder, MethodBuilder, FieldBuilder, and Visitor Interfaces.The jdk.classfile API offers a ClassFile class for safe manipulation of class metadata and bytecode instructions.Code examples demonstrate generating and transforming class files using ASM library with Java bytecode.ClassFileExample shows creating a class with fields, constructor, and a main method printing a message.The transformClass method injects a logging statement into the main method of the bytecode.The potential for bytecode manipulation opens up advanced Java programming possibilities.Understanding the Class-File API is essential for tasks like bytecode manipulation and class loading.The article presents a comprehensive guide on using Class-File API features for Java developers.