Awesome GitHub RepositoriesRuntime Class Constructors

Byte Buddy is a runtime code generation and bytecode manipulation library for Java. It provides a fluent API for creating and modifying Java classes during execution, enabling developers to define class structures, methods, and fields programmatically without requiring a compiler or direct bytecode assembly. The library supports agent-based class transformation, allowing loaded classes to be modified during JVM startup or runtime through a Java agent that intercepts class loading. It offers bytecode-level method interception for fine-grained control over method behavior, annotation-based code

attrs is a Python library that automatically generates initialization, representation, equality, hashing, and ordering methods from declarative class attribute definitions. At its core, it provides a class decorator metaprogramming framework that intercepts class creation to rewrite the class body, producing dunder methods without manual boilerplate. The library includes a comprehensive attribute validation toolkit with built-in validators for type checks, range constraints, regex matching, length limits, and logical composition of validation rules. The library distinguishes itself through it

Javassist 是一个用于分析、修改和生成 Java 字节码和类文件的字节码工程工具包。它作为一个字节码操作库，允许通过直接字节码访问或高级源代码语法来编辑类文件。 该项目提供专门的工具，用于在运行时程序化创建新的 Java 类和接口。它包括用于拦截方法调用的动态代理生成器，以及在类加载到 Java 虚拟机时自动修改类定义的类加载器拦截器。 其他功能涵盖 Java 字节码分析和热代码重载，以替换运行进程中的类定义。该工具包还支持修改已编译的类文件，并检查方法指令以了解程序流。