Tagged articles

Collections

250 articles · Page 3 of 3

Oct 23, 2019 · Fundamentals

Java Programming Techniques: Collections, ThreadLocal, Pair, Enum, Union, and Generics

The article presents a toolbox of practical Java techniques—including using HashSet for fast duplicate detection, HashMap for building hierarchical structures, ThreadLocal for thread‑specific data, Pair and custom holder classes for multiple return values, enum definitions, union‑style classes, and generic and wildcard patterns—to streamline everyday coding tasks.

CollectionsEnumsJava

0 likes · 22 min read

Java Programming Techniques: Collections, ThreadLocal, Pair, Enum, Union, and Generics

Java Captain

Oct 22, 2019 · Backend Development

Common Java Coding Pitfalls and Best‑Practice Recommendations

This article enumerates typical Java coding mistakes—such as using "where 1=1" in MyBatis, iterating Map inefficiently, neglecting Collection.isEmpty, omitting collection size hints, concatenating strings in loops, overusing List.contains, misusing static initializers, keeping redundant code, and more—while providing concise, performance‑oriented corrections with clear examples.

CollectionsJavacode optimization

0 likes · 13 min read

Common Java Coding Pitfalls and Best‑Practice Recommendations

21CTO

Oct 21, 2019 · Backend Development

Boost Java Performance: 16 Proven Coding Practices You Should Adopt

This article presents sixteen practical Java coding guidelines—ranging from avoiding "where 1=1" in MyBatis to using static blocks for collection initialization, preferring Set over List for contains checks, and returning empty collections instead of null—to help developers write more efficient, readable, and safe backend code.

Backend DevelopmentCollectionsJava

0 likes · 17 min read

Boost Java Performance: 16 Proven Coding Practices You Should Adopt

Full-Stack Internet Architecture

Oct 20, 2019 · Fundamentals

Understanding the Differences Between TreeSet, HashSet, HashMap, TreeMap, and Red-Black Trees in Java

An interview-style dialogue explains the distinctions between TreeSet and HashSet, the underlying implementations of HashMap versus TreeMap, and how red‑black trees provide balanced performance, covering hash collisions, treeification, and thread‑safety considerations in Java collections.

CollectionsData StructuresHashMap

0 likes · 6 min read

Understanding the Differences Between TreeSet, HashSet, HashMap, TreeMap, and Red-Black Trees in Java

Selected Java Interview Questions

Oct 10, 2019 · Fundamentals

Choosing Between HashMap and TreeMap in Java

This article explains the differences between Java's HashMap and TreeMap, covering their underlying implementations, performance characteristics, ordering behavior, and how to use a custom comparator to achieve descending order, helping developers choose the appropriate map based on ordering and efficiency needs.

CollectionsComparatorData Structures

0 likes · 8 min read

Choosing Between HashMap and TreeMap in Java

Jike Tech Team

Sep 25, 2019 · Mobile Development

Why Kotlin Differs from Java: Constructors, init Blocks, and Static Alternatives

This article explores the key differences between Kotlin and Java for Android development, covering constructors, init blocks, val versus final, static equivalents with companion objects, top‑level declarations, arrays, collections, sequences, visibility modifiers, and includes practical exercises.

AndroidCollectionsCompanion Object

0 likes · 23 min read

Why Kotlin Differs from Java: Constructors, init Blocks, and Static Alternatives

Beike Product & Technology

Sep 20, 2019 · Fundamentals

In‑Depth Analysis of Java ArrayList Implementation

This article provides a comprehensive overview and source‑code dissection of Java's ArrayList, covering its inheritance hierarchy, fields, constructors, addition, removal, modification, traversal, serialization, sorting, array conversion, thread‑safety considerations, and practical usage tips.

ArrayListCollectionsData Structures

0 likes · 16 min read

In‑Depth Analysis of Java ArrayList Implementation

Full-Stack Internet Architecture

Sep 2, 2019 · Fundamentals

Introduction to Java 8 Stream API: Creation, Intermediate and Terminal Operations

This article introduces Java 8’s Stream API, explaining its purpose, key characteristics, how to create streams from collections or directly, and demonstrating common intermediate operations such as filter, map, limit, sorted, distinct, as well as terminal operations like forEach, count, and collect, with code examples.

CollectionsFunctional ProgrammingIntermediate Operations

0 likes · 9 min read

Introduction to Java 8 Stream API: Creation, Intermediate and Terminal Operations

Java Backend Technology

Jun 11, 2019 · Backend Development

Why Overriding equals Without hashCode Breaks Java Collections

This article explains the contract of equals and hashCode in Java, shows what goes wrong when only equals is overridden, provides a vivid house‑ownership analogy, and offers practical guidelines and code examples for correctly overriding both methods.

Backend DevelopmentCollectionsJava

0 likes · 5 min read

Why Overriding equals Without hashCode Breaks Java Collections

Java Backend Technology

Jun 10, 2019 · Backend Development

Why Arrays.asList Can Trap You: Common Mistakes and How to Avoid Them

This article explains why using Java's Arrays.asList can lead to unexpected behavior, illustrates three typical pitfalls with primitive arrays, mutable lists, and unsupported modifications, and provides detailed analysis, source code insights, and practical alternatives for safely converting arrays to collections.

Arrays.asListBackend DevelopmentCollections

0 likes · 6 min read

Why Arrays.asList Can Trap You: Common Mistakes and How to Avoid Them

Programmer DD

May 27, 2019 · Backend Development

Top 10 Java Mistakes Every Developer Should Avoid

This article lists and explains ten of the most common errors Java developers make—from misusing Arrays.asList and raw types to incorrect loop deletions, mutable versus immutable objects, and constructor pitfalls—providing correct code examples and best‑practice recommendations.

ArrayListCollectionsbest-practices

0 likes · 11 min read

Top 10 Java Mistakes Every Developer Should Avoid

Java Captain

Mar 16, 2019 · Fundamentals

Common Java Containers and Their Differences

This article explains the most frequently used Java containers, clarifies the distinctions between Collection and Collections, compares List, Set, and Map, and details the implementation principles and usage differences of HashMap, HashSet, ArrayList, LinkedList, and related collection classes.

ArrayListCollectionsHashMap

0 likes · 9 min read

Common Java Containers and Their Differences

Big Data Technology & Architecture

Mar 15, 2019 · Fundamentals

Scala Series Article Collection – Curated List of Tutorials

This resource provides a curated collection of links to a series of Scala tutorial articles covering installation, basic syntax, data types, variables, access modifiers, operators, control structures, functions, collections, traits, pattern matching, and more, offering a comprehensive learning path for developers.

CollectionsFundamentalsScala

0 likes · 3 min read

Scala Series Article Collection – Curated List of Tutorials

Big Data Technology & Architecture

Mar 12, 2019 · Fundamentals

Overview of Scala Collections: Mutable and Immutable Types with Examples

This article introduces Scala's collection library, explaining the distinction between mutable and immutable collections and detailing common types such as List, Set, Map, Tuple, Option, and Iterator, accompanied by example code for each.

CollectionsImmutableList

0 likes · 3 min read

Overview of Scala Collections: Mutable and Immutable Types with Examples

Java Captain

Mar 1, 2019 · Fundamentals

Introduction and Source Code Analysis of Java ArrayList

This article introduces Java's ArrayList as a dynamic array implementation, explains its non‑thread‑safe nature, details its constructors, capacity‑growth strategy, key methods such as ensureCapacity, add, remove, toArray, and examines the underlying source code including array copying utilities.

ArrayListCollectionsDataStructure

0 likes · 13 min read

Introduction and Source Code Analysis of Java ArrayList

Big Data Technology & Architecture

Feb 15, 2019 · Backend Development

Understanding CopyOnWriteArrayList: Introduction, Principles, API, and Source‑Code Analysis

This article introduces Java's CopyOnWriteArrayList, explains its dynamic‑array and thread‑safety mechanisms, lists the most important methods, provides detailed source‑code walkthroughs for constructors, add, get, remove and iterator implementations, and demonstrates its behavior with a multithreaded example compared to ArrayList.

CollectionsCopyOnWriteArrayListJava

0 likes · 14 min read

Understanding CopyOnWriteArrayList: Introduction, Principles, API, and Source‑Code Analysis

Big Data Technology & Architecture

Feb 15, 2019 · Backend Development

CopyOnWriteArraySet in Java: Introduction, Principles, API, and Example

This article introduces Java's CopyOnWriteArraySet, explains its thread‑safe design and underlying data structure, lists its core methods, and provides a complete example comparing its behavior with HashSet under concurrent modifications, illustrating when to use this collection.

CollectionsCopyOnWriteArraySetJava

0 likes · 8 min read

CopyOnWriteArraySet in Java: Introduction, Principles, API, and Example

Big Data Technology & Architecture

Feb 14, 2019 · Fundamentals

In‑Depth Analysis of Java HashMap Implementation and Usage

This article provides a comprehensive overview of Java's HashMap, covering its purpose as a key‑value store, the evolution of its internal data structures from JDK 1.7 to JDK 1.8, detailed explanations of core methods such as hash, put, get, resize, and practical example code illustrating common operations.

CollectionsData StructureHashMap

0 likes · 18 min read

In‑Depth Analysis of Java HashMap Implementation and Usage

Big Data Technology & Architecture

Feb 14, 2019 · Fundamentals

Understanding Java LinkedList: Definition, Implementation, and Core Operations

This article provides a comprehensive overview of Java's LinkedList class, covering its definition, internal node structure, constructors, element addition and removal methods, traversal techniques, iterator behavior, and concurrency considerations, all illustrated with complete source code examples.

CollectionsData StructuresIterator

0 likes · 14 min read

Understanding Java LinkedList: Definition, Implementation, and Core Operations

Big Data Technology & Architecture

Feb 14, 2019 · Backend Development

Deep Dive into Java ArrayList: Implementation, Core Methods, and Usage Patterns

This article provides a comprehensive overview of Java's ArrayList, covering its internal structure, key fields, constructors, core operations such as adding, removing, and searching elements, traversal techniques, fail‑fast behavior, and a comparison with Vector, all illustrated with original source code snippets.

ArrayListCollectionsData Structures

0 likes · 18 min read

Deep Dive into Java ArrayList: Implementation, Core Methods, and Usage Patterns

Java Captain

Jan 14, 2019 · Fundamentals

Understanding Java HashMap: Principles, Operations, and Interview Insights

This article explains the fundamentals of Java's HashMap, covering its internal structure, hash computation, insertion and retrieval processes, collision handling, resizing, thread‑safety concerns, differences with Hashtable, and practical interview questions with code examples.

CollectionsHashMapJava

0 likes · 17 min read

Understanding Java HashMap: Principles, Operations, and Interview Insights

Programmer DD

Dec 11, 2018 · Backend Development

Unlock Java 11: Powerful New Features You Need to Know

This article introduces Java 11's most useful enhancements—including the var keyword, new String utilities, collection factory methods, Stream API additions, InputStream.transferTo, and the revamped HttpClient—showing how each feature simplifies code and improves productivity for modern Java developers.

CollectionsHttpClientInputStream

0 likes · 7 min read

Unlock Java 11: Powerful New Features You Need to Know

High Availability Architecture

Sep 28, 2018 · Fundamentals

New Features in Java 9–11: Local Variable Type Inference, HTTP Client, Collections, Streams, Optionals, and More

This article introduces the major Java 9‑11 language and API enhancements—including var type inference, the standardized HttpClient, immutable collection factories, new Stream methods, Optionals improvements, and additional VM features—providing concise code examples for engineers and architects.

CollectionsHTTP ClientJava

0 likes · 6 min read

New Features in Java 9–11: Local Variable Type Inference, HTTP Client, Collections, Streams, Optionals, and More

Test Development Learning Exchange

Aug 28, 2018 · Fundamentals

Understanding Python frozenset: Immutable Sets and Their Operations

This article explains Python's frozenset type, detailing its immutable nature, creation syntax, differences from mutable sets, supported operations, membership testing, and practical code examples illustrating set algebra and method usage.

CollectionsData StructuresImmutable

0 likes · 9 min read

Understanding Python frozenset: Immutable Sets and Their Operations

ITFLY8 Architecture Home

Aug 11, 2018 · Fundamentals

Explore Java Core Concepts: JVM GC, Concurrency, and Collection Diagrams

This article presents a collection of visual diagrams that map key Java fundamentals, including a JVM garbage‑collection overview, Java concurrency structures, comprehensive collection maps, and detailed class diagrams for List, Map, and Set, offering developers clear reference graphics for understanding core Java APIs.

Class DiagramCollectionsJVM

0 likes · 1 min read

Explore Java Core Concepts: JVM GC, Concurrency, and Collection Diagrams

Architecture Digest

Aug 10, 2018 · Backend Development

Essential Skills for a Java Developer with Three Years of Experience

This article outlines the key Java knowledge areas—including syntax, collections, frameworks, databases, web concepts, data structures, JVM internals, design patterns, multithreading, and JDK source code—that a developer with three years of experience should master to excel in interviews and increase earning potential.

CollectionsJVMJava

0 likes · 11 min read

Essential Skills for a Java Developer with Three Years of Experience

Java Captain

Jul 18, 2018 · Fundamentals

Understanding Java Collections: LinkedList, ArrayList, Stack, Queue, HashMap, and LinkedHashMap with Animations and Code Examples

This article systematically explains common Java collection classes—including LinkedList, ArrayList, Stack, Queue, HashMap, and LinkedHashMap—highlighting their internal structures, key operations, performance characteristics, and JDK 8 differences, and it provides animated illustrations and full code snippets for each concept.

ArrayListCollectionsData Structures

0 likes · 9 min read

Understanding Java Collections: LinkedList, ArrayList, Stack, Queue, HashMap, and LinkedHashMap with Animations and Code Examples

Full-Stack Internet Architecture

Jul 16, 2018 · Fundamentals

Overview of the Java Collections Framework and Its Core Data Structures

This article provides a comprehensive overview of the Java Collections Framework, detailing its core interfaces, common implementations such as List, Set, Queue, and Map, their underlying data structures, performance characteristics, and usage examples including legacy classes and specialized collections like PriorityQueue and LinkedHashMap.

ArrayListCollectionsData Structures

0 likes · 8 min read

Overview of the Java Collections Framework and Its Core Data Structures

Java Captain

Jun 22, 2018 · Fundamentals

Understanding HashMap Internals and Building a Miniature HashMap in Java

This article explains the core design of Java's HashMap—including its hash function, array storage, and linked‑list collision handling—and walks through creating a simplified MiniHashMap implementation with interfaces, constructors, put/get methods, resizing, and testing.

CollectionsData StructuresHashMap

0 likes · 5 min read

Understanding HashMap Internals and Building a Miniature HashMap in Java

Java Captain

May 29, 2018 · Fundamentals

Understanding Java Generics: Concepts, Usage, and Practical Examples

This article explains the importance of Java generics, demonstrates common pitfalls with raw collections, shows how generics provide compile‑time type safety, and covers generic classes, interfaces, wildcards, methods, bounds, and array usage with clear code examples.

CollectionsJavaProgramming Fundamentals

0 likes · 21 min read

Understanding Java Generics: Concepts, Usage, and Practical Examples

Java Backend Technology

May 19, 2018 · Backend Development

How to Ace Junior and Senior Java Backend Interviews: A Practical Guide

This guide outlines a comprehensive, step‑by‑step strategy for preparing Java backend interview candidates—covering architecture, databases, core Java, multithreading, JVM, and practical tips to demonstrate senior‑level expertise.

CollectionsJVMSQL

0 likes · 12 min read

How to Ace Junior and Senior Java Backend Interviews: A Practical Guide

Java Captain

May 16, 2018 · Fundamentals

Comprehensive Java Interview Guide: OOP, Concurrency, Collections, JVM, and More

This article provides a thorough overview of core Java concepts frequently asked in interviews, covering object‑oriented fundamentals, polymorphism, interfaces vs abstract classes, data types, memory management, concurrency mechanisms, collections, JVM internals, and best‑practice coding examples.

CollectionsFundamentalsJVM

0 likes · 47 min read

Comprehensive Java Interview Guide: OOP, Concurrency, Collections, JVM, and More

Java Captain

Apr 21, 2018 · Fundamentals

Deep Dive into Java HashMap: Source Code Analysis and Design Concepts

This article provides a comprehensive analysis of Java's HashMap implementation, covering its class signature, inheritance hierarchy, hash function design, core operations such as get, put, and remove, internal data structures, resizing logic, iterator behavior, and serialization details, all illustrated with original source code snippets.

CollectionsData StructuresHashMap

0 likes · 24 min read

Deep Dive into Java HashMap: Source Code Analysis and Design Concepts

Java Captain

Apr 20, 2018 · Fundamentals

Overview of Java Collections Framework

This article provides a high‑level overview of Java’s Collections Framework, explaining its core design principles, the top‑level Collection and Map interfaces, their sub‑interfaces such as List, Set, Queue, and Map, and the typical implementation naming conventions, helping developers understand and analyze collection classes.

CollectionsData StructuresJava

0 likes · 7 min read

Java Captain

Apr 13, 2018 · Fundamentals

Java ArrayList Overview and Source Code Walkthrough

This article provides an overview of Java's ArrayList class, explaining its dynamic array implementation, thread-safety considerations, key interfaces, constructors, capacity management, core methods, and internal mechanisms such as ensureCapacity, trimToSize, and serialization, accompanied by detailed source code excerpts and practical insights.

ArrayListCollectionsData Structures

0 likes · 13 min read

Java ArrayList Overview and Source Code Walkthrough

Java Captain

Apr 8, 2018 · Fundamentals

Java Fundamentals: OOP Principles, Collections, IO Streams, Socket Programming, Databases, and JSP Overview

This comprehensive guide introduces Java fundamentals, covering object‑oriented concepts, the collections framework, various I/O streams, socket communication, relational database basics with SQL examples, and an overview of JSP, its objects, directives, and web application lifecycle.

CollectionsFundamentalsIO

0 likes · 14 min read

Java Fundamentals: OOP Principles, Collections, IO Streams, Socket Programming, Databases, and JSP Overview

MaGe Linux Operations

Feb 2, 2018 · Fundamentals

Master Pythonic Loops: Elegant Techniques for Cleaner Code

The article presents Raymond Hettinger's PyCon 2013 notes on writing Pythonic code, covering loops, collections, dictionary handling, performance tips, context managers, and best practices, with examples and improved alternatives to help developers write clear, efficient, and idiomatic Python.

CollectionsLoopsPython

0 likes · 15 min read

Master Pythonic Loops: Elegant Techniques for Cleaner Code

Java Captain

Jan 27, 2018 · Fundamentals

Key Java Interview Questions and Answers (2017 Edition)

This article compiles essential Java interview questions covering topics such as switch statements, equality operators, object methods, reference types, hashCode, string handling, overriding, abstract classes, XML parsing, thread control, memory layout, polymorphism, garbage collection, and collections, providing concise explanations to help job seekers prepare effectively.

CollectionsFundamentalsGarbage Collection

0 likes · 16 min read

Key Java Interview Questions and Answers (2017 Edition)

Java Captain

Dec 28, 2017 · Fundamentals

Java Programming Essentials: Implementing equals, hashCode, compareTo, clone, and Common Idioms

This article presents a collection of essential Java programming practices, covering how to correctly implement equals, hashCode, compareTo, clone, use StringBuilder, generate random numbers, manage threads, handle I/O with try‑finally, perform defensive checks, and manipulate arrays and primitive packing.

Collectionsbest practicesclone

0 likes · 14 min read

Java Programming Essentials: Implementing equals, hashCode, compareTo, clone, and Common Idioms

Hujiang Technology

Aug 7, 2017 · Fundamentals

Kotlin Generics, Collections, and Operators – Chapter 6

This article explains Kotlin's generic type system, collection interfaces, variance with in/out keywords, collection initialization methods, and the extensive set of operators, providing code examples and implementation details to help developers master Kotlin's core language features.

CollectionsKotlinMobile Development

0 likes · 8 min read

Kotlin Generics, Collections, and Operators – Chapter 6

Architecture Digest

Jul 9, 2017 · Fundamentals

Overview of the Java Collections Framework and Its Core Interfaces

This article provides a comprehensive overview of Java's Collections Framework, explaining the purpose and hierarchy of core interfaces such as Collection, Iterable, Iterator, List, Set, Queue, and Map, along with their key methods and typical implementations.

CollectionsIteratorList

0 likes · 28 min read

Overview of the Java Collections Framework and Its Core Interfaces

360 Quality & Efficiency

Mar 3, 2017 · Backend Development

Using Postman for API Testing: Installation, Requests, Collections, Variables, Scripts, and Test Cases

This guide introduces Postman as a Chrome extension for API testing, covering installation, request composition, collections, environment and global variables, pre‑request and test scripts with code examples, and best practices for automating and validating HTTP responses.

API testingCollectionsPostman

0 likes · 7 min read

Using Postman for API Testing: Installation, Requests, Collections, Variables, Scripts, and Test Cases

ITPUB

May 26, 2016 · Databases

Understanding PL/SQL Collections: Index‑by Tables, Nested Tables, and VARRAYs

This article explains Oracle PL/SQL collection types—index‑by tables, nested tables, and VARRAYs—detailing their definitions, initialization rules, element access, practical code examples, and the built‑in methods available for manipulating these collections.

CollectionsIndex-by TableNested Table

0 likes · 7 min read

Understanding PL/SQL Collections: Index‑by Tables, Nested Tables, and VARRAYs

Qunar Tech Salon

Feb 1, 2016 · Backend Development

Spring Dependency Injection: Injecting Collections, Arrays, Maps, Properties, Bean References and Advanced Configurations

This article explains how Spring's XML configuration can inject simple values, collections, arrays, maps, Properties, bean references, internal beans, null values, and object‑graph navigation, and it provides concise syntax examples and test code for each case.

BeansCollectionsDependency Injection

0 likes · 20 min read

Spring Dependency Injection: Injecting Collections, Arrays, Maps, Properties, Bean References and Advanced Configurations

ITPUB

Nov 12, 2015 · Fundamentals

Essential Differences and Usage Tips for Java Collections

This article explains why Map does not extend Collection, compares HashMap with Hashtable, clarifies Comparable versus Comparator, shows how to sort object lists, distinguishes fail‑fast from fail‑safe iterators, and outlines key differences among Set, List, ArrayList, Vector, and related Java collection classes.

ArrayListCollectionsHashMap

0 likes · 7 min read

Essential Differences and Usage Tips for Java Collections

Qunar Tech Salon

Jun 3, 2015 · Fundamentals

Understanding HashMap ConcurrentModificationException and Using ConcurrentHashMap in Java

This article explains why iterating and removing entries from a HashMap throws ConcurrentModificationException, describes the internal iterator mechanism, and provides correct solutions using an Iterator or replacing HashMap with ConcurrentHashMap, including detailed explanations of ConcurrentHashMap's structure and its get, put, remove, size, and iteration implementations.

CollectionsConcurrentModificationExceptionData Structures

0 likes · 11 min read

Understanding HashMap ConcurrentModificationException and Using ConcurrentHashMap in Java

Qunar Tech Salon

Feb 12, 2015 · Fundamentals

Understanding Java Generics: Motivation, Structure, and Usage

This article provides a comprehensive overview of Java generics, explaining their motivation, syntax, type‑safety benefits, class and method declarations, wildcard usage, and best‑practice principles such as PECS, while illustrating concepts with clear code examples.

CollectionsJavaPECS

0 likes · 12 min read

Understanding Java Generics: Motivation, Structure, and Usage

Qunar Tech Salon

Nov 30, 2014 · Backend Development

Using Guava Functional Programming in Java: Functions, Predicates, and Best Practices

This article explains how to use Guava’s functional programming features in Java, covering Functions and Predicates, providing code examples, discussing potential pitfalls such as overly verbose anonymous classes, and offering guidance on when to prefer functional versus imperative approaches.

Backend DevelopmentCollectionsFunctional Programming

0 likes · 10 min read

Using Guava Functional Programming in Java: Functions, Predicates, and Best Practices

Qunar Tech Salon

Nov 26, 2014 · Fundamentals

Powerful Collection Utility Classes: Guava Tools Not Covered by java.util.Collections

This article explains Guava's extensive collection utility classes that complement or replace java.util.Collections, covering static factory methods, Iterable utilities, and specialized tools for Lists, Sets, Maps, Multisets, Multimaps, and Tables, with code examples illustrating their usage and advantages.

CollectionsGuavaJava

0 likes · 27 min read

Powerful Collection Utility Classes: Guava Tools Not Covered by java.util.Collections