以下是实现自定义类加载器加载.class文件的完整方案，包含两个关键组件：

import java.io.*;

import java.nio.file.*;

public class CustomClassLoader extends ClassLoader {

    private final String classPath;

    

    public CustomClassLoader(String classPath) {

        this.classPath = classPath;

    }

    

    @Override

    protected Class findClass(String name) throws ClassNotFoundException {

        try {

            byte[] bytes = loadClassData(name);

            return defineClass(name, bytes, 0, bytes.length);

        } catch (IOException e) {

            throw new ClassNotFoundException(name);

        }

    }

    

    private byte[] loadClassData(String className) throws IOException {

        String path = classPath + File.separator + 

                     className.replace('.', File.separatorChar) + ".class";

        return Files.readAllBytes(Paths.get(path));

    }

}

public class Main {

    public static void main(String[] args) throws Exception {

        CustomClassLoader loader = new CustomClassLoader("/path/to/classes");

        Class clazz = loader.loadClass("com.example.MyClass");

        Object instance = clazz.getDeclaredConstructor().newInstance();

        System.out.println("Loaded class: " + clazz.getName());

    }

}

使用说明：1. 将编译好的.class文件放在指定目录 2. 修改/path/to/classes为实际路径 3. 运行时将加载并实例化指定类。注意保持包目录结构。

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