是否可以在运行时指定System ClassLoader加载.class文件？

public class CustomClassLoader extends ClassLoader {
    @Override
    protected Class<?> findClass(String name) throws ClassNotFoundException {
        // 从特定位置加载.class文件
        byte[] classData = loadClassData(name);
        if (classData == null) {
            throw new ClassNotFoundException(name);
        }
        return defineClass(name, classData, 0, classData.length);
    }

    private byte[] loadClassData(String name) {
        // 从特定位置加载.class文件的字节数据
    }
}

URL[] urls = new URL[] { new URL("file:/path/to/classes/") };
URLClassLoader classLoader = new URLClassLoader(urls);
Class<?> clazz = classLoader.loadClass("com.example.MyClass");

URL[] urls = new URL[] { new URL("file:/path/to/classes/") };
URLClassLoader classLoader = new URLClassLoader(urls);

// 获取System ClassLoader实例
ClassLoader systemClassLoader = ClassLoader.getSystemClassLoader();

// 使用反射获取defineClass方法
Method defineClassMethod = ClassLoader.class.getDeclaredMethod("defineClass", String.class, byte[].class, int.class, int.class);
defineClassMethod.setAccessible(true);

// 加载.class文件并定义类
byte[] classData = loadClassData("com.example.MyClass");
Class<?> clazz = (Class<?>) defineClassMethod.invoke(systemClassLoader, "com.example.MyClass", classData, 0, classData.length);