deep copy | BestHub

Cognitive Technology Team

Jun 5, 2025 · Backend Development

Why BeanUtils.copyProperties Is a Hidden Performance Killer and What to Use Instead

BeanUtils.copyProperties, a convenient Apache Commons utility for Java bean copying, harbors multiple hidden pitfalls—including reflection overhead, unsafe type conversion, null‑value overwrites, shallow copy issues, and limited depth—so developers should evaluate modern alternatives like MapStruct, Dozer, or manual mapping for better performance and safety.

BeanUtilsJavaMapStruct

0 likes · 7 min read

Why BeanUtils.copyProperties Is a Hidden Performance Killer and What to Use Instead

Raymond Ops

Apr 18, 2025 · Fundamentals

Master Python Class vs Static Methods, Deep/Shallow Copies, and Decorators

This comprehensive guide explains Python’s class and static methods, compares deep and shallow copying techniques, demystifies decorators, and reveals how variables are stored in memory, providing clear examples and best‑practice recommendations for writing efficient, maintainable code.

Memory ManagementPythonclass methods

0 likes · 13 min read

Master Python Class vs Static Methods, Deep/Shallow Copies, and Decorators

Test Development Learning Exchange

Sep 3, 2024 · Fundamentals

Understanding Deep Copy in Python with Practical Examples

This article explains the concept of deep copy in Python, demonstrating how it recursively copies all nested objects using the copy module's deepcopy function, with practical examples including basic data types, lists, dictionaries, and custom objects.

Data StructuresObject Copycopy module

0 likes · 4 min read

Understanding Deep Copy in Python with Practical Examples

Test Development Learning Exchange

Aug 2, 2024 · Fundamentals

Understanding Shallow Copy and Deep Copy in Python with Examples

This article explains the concepts of shallow copy and deep copy in Python, describes their differences, and provides numerous code examples—including lists, dictionaries, and custom classes—to demonstrate how to use the copy module’s copy and deepcopy functions effectively.

Object Cloningcode examplescopy module

0 likes · 8 min read

Understanding Shallow Copy and Deep Copy in Python with Examples

Test Development Learning Exchange

Feb 28, 2024 · Backend Development

Using Deep Copy in Python for Isolated API Test Parameters

Deep copy in Python is demonstrated through multiple practical examples—including request parameter duplication, handling nested data structures, managing global configurations, multithreaded test execution, and database interactions—to ensure isolated, independent data for each API test case, preventing data contamination and race conditions.

API TestingBackendPython

0 likes · 10 min read

Using Deep Copy in Python for Isolated API Test Parameters

Mike Chen's Internet Architecture

Nov 20, 2023 · Fundamentals

Prototype Pattern: Definition, UML Diagram, Implementation, Advantages, Disadvantages, and Use Cases

This article explains the Prototype design pattern, covering its definition, UML class diagram, Java implementation with shallow and deep copy examples, advantages and drawbacks, comparisons with Factory Method and Singleton patterns, and practical scenarios where cloning objects provides an efficient alternative to costly object creation.

JavaObject CloningPrototype Pattern

0 likes · 14 min read

Prototype Pattern: Definition, UML Diagram, Implementation, Advantages, Disadvantages, and Use Cases

Test Development Learning Exchange

Oct 1, 2023 · Fundamentals

Understanding Deep Copy and Shallow Copy in Python 3

This article explains the concepts, differences, and practical code examples of deep copy and shallow copy in Python 3, illustrating how each method works, their impact on nested objects, and how to apply them in API automation parameterization scenarios.

Object Copyingautomationdeep copy

0 likes · 7 min read

Understanding Deep Copy and Shallow Copy in Python 3

Python Programming Learning Circle

Jul 27, 2022 · Fundamentals

Understanding Shallow and Deep Copy in Python

This article explains how Python variables reference objects in memory, distinguishes between shallow and deep copying, demonstrates three common copying techniques (slicing, factory functions, and the copy method) with lists and tuples, and shows how to use the copy module for deep copies.

PythonReferencecopy module

0 likes · 6 min read

Understanding Shallow and Deep Copy in Python

Selected Java Interview Questions

Dec 18, 2021 · Backend Development

Deep Copy in Java: Multiple Implementation Methods

This article explains the difference between shallow and deep copying in Java and provides five practical techniques—including constructor copying, overriding clone(), Apache Commons Lang serialization, Gson serialization, and Jackson serialization—complete with code examples and test cases to demonstrate each approach.

GsonJacksonJava

0 likes · 8 min read

Deep Copy in Java: Multiple Implementation Methods

Byte Quality Assurance Team

Oct 13, 2021 · Fundamentals

Understanding Python Object Assignment, Mutable vs. Immutable Types, and Shallow vs. Deep Copying

This article provides a comprehensive guide to Python's memory management and object assignment mechanisms, clearly explaining the differences between mutable and immutable objects, direct assignment, shallow copying, and deep copying through practical code examples and visual diagrams.

Data StructuresImmutable ObjectsMemory Management

0 likes · 7 min read

Understanding Python Object Assignment, Mutable vs. Immutable Types, and Shallow vs. Deep Copying

Java Tech Enthusiast

Sep 3, 2021 · Fundamentals

Understanding Java Marker Interfaces: Serializable, Cloneable, and RandomAccess

The article explains Java marker interfaces—Serializable, Cloneable, and RandomAccess—showing how their empty definitions signal capabilities such as object serialization, shallow or deep cloning, and fast list indexing, and demonstrates the practical effects on code behavior and performance.

CloningJavaMarker Interface

0 likes · 13 min read

Understanding Java Marker Interfaces: Serializable, Cloneable, and RandomAccess

Selected Java Interview Questions

Aug 10, 2021 · Fundamentals

Java Array Copying Methods: Loop, System.arraycopy, Arrays.copyOf, and clone

This article explains four Java array copying techniques—manual loop assignment, System.arraycopy, Arrays.copyOf (or copyOfRange), and clone—detailing their shallow or deep copy behavior, performance characteristics, and providing complete code examples with expected outputs.

Array CopyArrays.copyOfJava

0 likes · 10 min read

Java Array Copying Methods: Loop, System.arraycopy, Arrays.copyOf, and clone

Python Programming Learning Circle

Jul 10, 2021 · Fundamentals

Understanding Shallow and Deep Copy in Python

This article explains Python's shallow and deep copy mechanisms, demonstrates their differences with code examples, visual diagrams, and discusses when to use each approach, highlighting performance and memory considerations in software development.

Copydeep copyfundamentals

0 likes · 5 min read

Full-Stack Internet Architecture

Aug 4, 2020 · Fundamentals

Understanding the Prototype Design Pattern in Java

The article explains the Prototype design pattern in Java, covering its definition, class diagram, implementation with Cloneable, shallow vs deep copying, advantages, use cases, Spring prototype scope, and provides complete code examples illustrating cloning of Sheep, Goat, and Lamb objects.

CloningJavaPrototype Pattern

0 likes · 12 min read

Understanding the Prototype Design Pattern in Java

Selected Java Interview Questions

Jul 23, 2020 · Fundamentals

Understanding Reference, Shallow, and Deep Copy in Java

This article explains Java reference copying, object cloning, and the differences between shallow and deep copy, providing code examples and output analysis to illustrate how each method affects object identity and shared references.

CloningCopyJava

0 likes · 8 min read

Understanding Reference, Shallow, and Deep Copy in Java

FunTester

Dec 21, 2019 · Fundamentals

Demonstrating Deep vs Shallow Copy in Java Using Heap Dumps

This article explains how to avoid thread‑unsafe statistics collection by copying objects per thread, explores Java deep and shallow copying concepts, provides a concrete test program, and uses JConsole and heap dumps to verify the number of object instances created by each copying method.

Heap DumpJavadeep copy

0 likes · 6 min read

Demonstrating Deep vs Shallow Copy in Java Using Heap Dumps

Java Captain

Mar 17, 2019 · Fundamentals

Understanding Java Reflection, Serialization, Dynamic Proxies, and Object Cloning

This article explains Java reflection, serialization, dynamic proxy mechanisms, and object cloning techniques, including code examples and the differences between deep and shallow copies, providing a comprehensive overview of these core Java concepts.

CloningDynamic ProxySerialization

0 likes · 8 min read

Understanding Java Reflection, Serialization, Dynamic Proxies, and Object Cloning

360 Quality & Efficiency

Jun 13, 2018 · Fundamentals

Understanding Python Assignment, Shallow Copy, and Deep Copy

This article explains Python's variable storage model and demonstrates how assignment, shallow copy, and deep copy affect object references and memory addresses for immutable and mutable types, using string and list examples to illustrate the differences.

AssignmentImmutableMutable

0 likes · 4 min read

Understanding Python Assignment, Shallow Copy, and Deep Copy

Java Captain

Mar 31, 2018 · Fundamentals

Understanding Object Cloning in Java: Shallow vs Deep Copy

This article explains Java object cloning, detailing why cloning is needed, how to implement shallow and deep copies using the Cloneable interface and serialization, and provides comprehensive code examples illustrating the differences and pitfalls of reference copying.

CloneableCloningJava

0 likes · 15 min read

Understanding Object Cloning in Java: Shallow vs Deep Copy

Qunar Tech Salon

Aug 10, 2017 · Fundamentals

Understanding Deep and Shallow Copy in Objective‑C Collections and Memory Management

This article explains the concepts of shallow and deep copying in Objective‑C, detailing how pointers, memory regions, and collection types behave under copy and mutableCopy, introducing three copy levels (CL1‑CL3), and highlighting common pitfalls and best practices for safe memory management.

CopyMemory ManagementMutableCopy

0 likes · 7 min read

Understanding Deep and Shallow Copy in Objective‑C Collections and Memory Management