Prototype pattern is an object Creational pattern, whose purpose is to create new objects by copying the prototype of existing objects, rather than creating new objects through instantiation and initialization operations. In Python, you can use the 'copy' function provided by the 'copy' module to implement the Prototype pattern` The 'copy' function can be used for shallow and deep copying of objects. The following is an example code of using Python to implement the Prototype pattern: ```python import copy class Prototype: def __init__(self): self.objects = {} def register_object(self, name, obj): self.objects[name] = obj def unregister_object(self, name): del self.objects[name] def clone(self, name, **kwargs): obj = copy.deepcopy(self.objects.get(name)) obj.__dict__.update(kwargs) return obj class Object: def __init__(self, name): self.name = name def __str__(self): return f"Object: {self.name}" #Create prototype objects prototype = Prototype() #Create initial object obj1 = Object("Object 1") prototype.register_object("obj1", obj1) #Copy Object obj2 = prototype.clone("obj1", name="Object 2") print(obj1) print(obj2) ``` Run the above code and the output result is: ``` Object: Object 1 Object: Object 2 ``` In the example code, the 'Prototype' class is the definition of the prototype object, and the 'Object' class is the definition of the object to be copied. When creating a prototype object, first register the initial object and then use the 'clone' method to copy the object. The 'update' method allows you to update the properties of cloned objects. It should be noted that the 'copy. dropcopy' method is used to create deep copies of objects, ensuring that each cloned object is independent rather than sharing the same object.

Prototype pattern is a kind of creative design pattern, which uses prototype objects to create new objects without coupling with the classes of specific objects. In the Java SDK, the implementation of the Prototype pattern mainly depends on the Cloneable interface and the clone() method. 1. Cloneable interface: The Cloneable interface is an empty interface that simply identifies a class that can be replicated. Classes that implement the Cloneable interface can use the clone() method to create copies of objects. 2. Clone () method: The clone () method is a protected method in the Object class that is used to create and return a copy of the object that called it. To use the clone () method, you need to override it in a custom class and call super. clone () in the method. The following is a complete source code example of the framework code using the Prototype pattern: ```java class Prototype implements Cloneable { private String name; public Prototype(String name) { this.name = name; } public String getName() { return name; } @Override public Object clone() throws CloneNotSupportedException { return super.clone(); } } public class Main { public static void main(String[] args) throws CloneNotSupportedException { Prototype prototype = new Prototype("Prototype"); Prototype clone = (Prototype) prototype.clone(); System.out.println("Original: " + prototype.getName()); System.out.println("Clone: " + clone.getName()); } } ``` In the above example, a prototype class Prototype was created and the Cloneable interface was implemented. In the main method of the Main class, a prototype object prototype is first created, and then a clone object clone is created by calling the clone () method. Finally, print the names of the prototype object and the cloned object separately. Summary: Prototype pattern creates new objects by copying existing objects to avoid coupling with specific object classes. In Java, the implementation of the Prototype pattern depends on the Cloneable interface and the clone() method. It should be noted that when creating an object using the Prototype pattern, the constructor of the prototype object will not be executed, and the object copy is achieved by calling the clone () method.

Apache Commons Lang is a Java class library that provides many tool classes and practical methods for enhancing the Java foundation class library. Among them, the Prototype pattern SerializationUtils is one of the important functions in the library. Prototype pattern is a creative design pattern, which creates new objects by copying (cloning) the original objects, rather than creating them through constructors. By using the Prototype pattern, you can avoid directly calling the constructor to create new objects and improve the efficiency of object creation. In the Apache Commons Lang library, the SerializationUtils class provides methods for deep cloning of objects (through serialization and deserialization). Specifically, it achieves cloning by writing objects to a byte stream, then reading and creating a new object from the byte stream. The following is the complete source code of the SerializationUtils class in the Apache Commons Lang library: ```java import java.io.*; public class SerializationUtils { public static <T> T clone(final T object) { if (object == null) { return null; } final byte[] objectData = serialize(object); return deserialize(objectData); } @SuppressWarnings("unchecked") public static <T> T deserialize(final byte[] objectData) { if (objectData == null) { return null; } try (ByteArrayInputStream bais = new ByteArrayInputStream(objectData)) { try (ObjectInputStream ois = new ObjectInputStream(bais)) { return (T) ois.readObject(); } }Catch (IOException | ClassNotFoundException e){ throw new SerializationException(e); } } public static <T extends Serializable> byte[] serialize(final T obj) { if (obj == null) { return null; } try (ByteArrayOutputStream baos = new ByteArrayOutputStream()) { try (ObjectOutputStream oos = new ObjectOutputStream(baos)) { oos.writeObject(obj); return baos.toByteArray(); } } catch (IOException e) { throw new SerializationException(e); } } } ``` Summary: The Prototype pattern SerializationUtils in the Apache Commons Lang library provides a method for deep cloning of objects. It implements cloning by serializing and deserializing objects, and provides methods such as clone, serialize, and deserialize for use. The clone method of the SerializationUtils class makes it easy to clone objects without directly calling the constructor. This method not only improves the efficiency of object creation, but also maintains the independence between objects. It is a very convenient and practical Prototype pattern implementation.