?? ???? Amazon?? ? ?? ????? ????. ???? ??? ???? Medium?? ?? ????? ?? ?? ???. ?? ???? ??? ??????! ??? ??? ? ??? ????!

Java? ?? ?? ?? ? ??? ??? ??? ??????? ???? ?? ??? ??? Java ????? ??? ?? ??? ? ????. ? ????? ??? ??? ?? 5?? ?? ?????? ??? ???? ?? ??? ?? ??? ???? ???? ?? ??? ?????.

??? ?????? ASM? ??? ???? ??????. ??? ?? API? ??? ??? ?? ??? ??? ?????? ?????.

?? ??? ??? ???? ASM ?? ??? ????.

ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_FRAMES);
cw.visit(V1_8, ACC_PUBLIC, "DynamicClass", null, "java/lang/Object", null);

// Constructor
MethodVisitor mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
mv.visitCode();
mv.visitVarInsn(ALOAD, 0);
mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V", false);
mv.visitInsn(RETURN);
mv.visitMaxs(1, 1);
mv.visitEnd();

// Method: public void sayHello()
mv = cw.visitMethod(ACC_PUBLIC, "sayHello", "()V", null, null);
mv.visitCode();
mv.visitFieldInsn(GETSTATIC, "java/lang/System", "out", "Ljava/io/PrintStream;");
mv.visitLdcInsn("Hello, Dynamic World!");
mv.visitMethodInsn(INVOKEVIRTUAL, "java/io/PrintStream", "println", "(Ljava/lang/String;)V", false);
mv.visitInsn(RETURN);
mv.visitMaxs(2, 1);
mv.visitEnd();

cw.visitEnd();
byte[] bytes = cw.toByteArray();

???? "sayHello" ???? ???? ???? ???? ?????? ? ?? "DynamicClass"? ?????.

Javassist? Java ?? ?? ???? ???? ??? ??? ????? ? ?? ??? API? ?????.

? Javassist ?? ?? ??? ??? ?????.

ClassPool pool = ClassPool.getDefault();
CtClass cc = pool.makeClass("DynamicClass");

// Add a constructor
CtConstructor constructor = new CtConstructor(new CtClass[]{}, cc);
constructor.setBody("{}");
cc.addConstructor(constructor);

// Add a method
CtMethod method = new CtMethod(CtClass.voidType, "sayHello", new CtClass[]{}, cc);
method.setBody("System.out.println(\"Hello, Dynamic World!\");");
cc.addMethod(method);

// Generate the class
Class<?> clazz = cc.toClass();

???? ??? ?? ??? ??? ??? ??????.

?? ?????? ByteBuddy? ???? ??? ??? ?? ??? API? ?????. ??? ??? ?? ???? ?? ???? ???? ??? ?????.

??? ByteBuddy ????.

Class<?> dynamicType = new ByteBuddy()
    .subclass(Object.class)
    .name("DynamicClass")
    .defineMethod("sayHello", void.class, Modifier.PUBLIC)
    .intercept(FixedValue.value("Hello, Dynamic World!"))
    .make()
    .load(getClass().getClassLoader())
    .getLoaded();

Object instance = dynamicType.getDeclaredConstructor().newInstance();
Method method = dynamicType.getMethod("sayHello");
System.out.println(method.invoke(instance));

???? ??? API? ??? ??? ??????.

Cglib? ?? ??? ? ??? ??? ?? ???? ?? Spring? ?? AOP ?????? ?????.

? Cglib ??? ?? ???? ?????.

public interface PersonService {
    String getName();
}

public class PersonServiceImpl implements PersonService {
    public String getName() {
        return "John Doe";
    }
}

// Creating a dynamic proxy
Enhancer enhancer = new Enhancer();
enhancer.setSuperclass(PersonServiceImpl.class);
enhancer.setCallback(new MethodInterceptor() {
    public Object intercept(Object obj, Method method, Object[] args, MethodProxy proxy) throws Throwable {
        System.out.println("Before method call : " + method.getName());
        Object result = proxy.invokeSuper(obj, args);
        System.out.println("After method call : " + method.getName());
        return result;
    }
});

PersonService proxy = (PersonService) enhancer.create();
System.out.println(proxy.getName());

??? ?? ?? ??? ?????.

Byte Buddy Agent? ByteBuddy? ???? ? ??? ? ?? ??? ??? ??? ??? ??? ? ???? ?????. ?????? ?? ?? Java ????? ???? ???? ??? ????.

? ???? Byte Buddy Agent? ??? ??? ??? ???? ?????.

public class MyClass {
    public void originalMethod() {
        System.out.println("Original method");
    }
}

// Somewhere in your application
Instrumentation instrumentation = ByteBuddyAgent.install();

new ByteBuddy()
    .redefine(MyClass.class)
    .method(named("originalMethod"))
    .intercept(FixedValue.value("Redefined method"))
    .make()
    .load(MyClass.class.getClassLoader(), ClassReloadingStrategy.fromInstalledAgent());

MyClass instance = new MyClass();
instance.originalMethod(); // Prints "Redefined method"

?? ??? ??? ???? ?????.

????? ??? ???? ???, ?? ?? ??, ??? ???? ?? ????. ASM? ?? ??? ??? ??? ??? ???? Javassist ?? ByteBuddy? ? ??? ?? ??? ? ?????. Cglib? ?? ??? ??? ???? Byte Buddy Agent? ??? ??? ???? ?????.

????? ??? ????? ??? ??? ? ?? ?? ??? ??? ?? ???? ???? ???. ??? ???? ?? ??? ? ?? ???. ??? ?? ??? ?????.

????? ??? ?????? ???? ?? ???? ???? Java ??????? ???? ? ??? ???. ??? ??????? ?? ??? ????? ???? ????? ???? ???.

101?

101 Books? ?? Aarav Joshi? ?? ??? AI ?? ??????. ??? AI ?? ?? ??? ?? ??? ??????. ?? ??? ??? $4?? ???? ?? ??? ??? ??? ???? ? ????.

Amazon?? Golang Clean Code ?? ?????.

???? ? ??? ?????. ? ?? ?? ??? Aarav Joshi? ???? ??? ??? ???? ?? ??? ????!

??? ???

?? ???? ????:

???? ??? | ??? ?? ???? | ?? ?? ??? | ????? | ??? ??? | ????? ???? | ???? | ??? ??? | JS ??

Medium? ????

?? ??? ???? | Epochs & Echoes World | ??????? | ???? ???? ?? | ??? ??? ?? | ?? ????

? ??? ?? ?? ??? ?? ??? Java ????? ?? ?????? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!