search
HomeJavajavaTutorialExploring the essence of Java Iterator and Iterable: revealing the underlying principles of Java collection traversal

Java Iterator 和 Iterable 的本质探索:揭秘 Java 集合遍历的底层原理

php editor Xigua Java Iterator and Iterable's essence exploration topic will deeply analyze the underlying principles of Java collection traversal. Through the discussion of Iterator and Iterable, the core mechanism of collection traversal in Java is revealed, helping readers gain a deeper understanding of the design and implementation of the Java collection framework.

List<String> names = new ArrayList<>();
names.add("Alice");
names.add("Bob");
names.add("Carol");

// 获取 Iterator 实例
Iterator<String> iterator = names.iterator();

// 遍历集合元素
while (iterator.hasNext()) {
String name = iterator.next();
System.out.println(name);
}

The Iterable interface is the sister interface of Iterator. It defines the iterator() method, which is used to return an Iterator instance of the collection. The Iterable interface is more convenient to use than Iterator. When using Iterable to traverse a collection, you can directly use the for-each statement without explicitly obtaining an Iterator instance.

for (String name : names) {
System.out.println(name);
}

The underlying implementation of Iterator and Iterable depends on the specific implementation of the collection type. For example, for ArrayList, its Iterator instance is actually a pointer pointing to the element in the collection. Each time the next() method is called, the pointer will be moved to The next element. For LinkedList, its Iterator instance is actually a linked list node, and each call to the next() method will move to the next linked list node.

Understanding the underlying principles of Iterator and Iterable helps us better understand how the Java collection framework works and write more efficient and robust code. This article's in-depth exploration of Iterator and Iterable can help Java programmers improve their understanding of the Java collection framework and write more elegant and efficient code.

The above is the detailed content of Exploring the essence of Java Iterator and Iterable: revealing the underlying principles of Java collection traversal. For more information, please follow other related articles on the PHP Chinese website!

Statement
This article is reproduced at:编程网. If there is any infringement, please contact admin@php.cn delete
Top 4 JavaScript Frameworks in 2025: React, Angular, Vue, SvelteTop 4 JavaScript Frameworks in 2025: React, Angular, Vue, SvelteMar 07, 2025 pm 06:09 PM

This article analyzes the top four JavaScript frameworks (React, Angular, Vue, Svelte) in 2025, comparing their performance, scalability, and future prospects. While all remain dominant due to strong communities and ecosystems, their relative popul

Spring Boot SnakeYAML 2.0 CVE-2022-1471 Issue FixedSpring Boot SnakeYAML 2.0 CVE-2022-1471 Issue FixedMar 07, 2025 pm 05:52 PM

This article addresses the CVE-2022-1471 vulnerability in SnakeYAML, a critical flaw allowing remote code execution. It details how upgrading Spring Boot applications to SnakeYAML 1.33 or later mitigates this risk, emphasizing that dependency updat

How do I implement multi-level caching in Java applications using libraries like Caffeine or Guava Cache?How do I implement multi-level caching in Java applications using libraries like Caffeine or Guava Cache?Mar 17, 2025 pm 05:44 PM

The article discusses implementing multi-level caching in Java using Caffeine and Guava Cache to enhance application performance. It covers setup, integration, and performance benefits, along with configuration and eviction policy management best pra

How does Java's classloading mechanism work, including different classloaders and their delegation models?How does Java's classloading mechanism work, including different classloaders and their delegation models?Mar 17, 2025 pm 05:35 PM

Java's classloading involves loading, linking, and initializing classes using a hierarchical system with Bootstrap, Extension, and Application classloaders. The parent delegation model ensures core classes are loaded first, affecting custom class loa

Iceberg: The Future of Data Lake TablesIceberg: The Future of Data Lake TablesMar 07, 2025 pm 06:31 PM

Iceberg, an open table format for large analytical datasets, improves data lake performance and scalability. It addresses limitations of Parquet/ORC through internal metadata management, enabling efficient schema evolution, time travel, concurrent w

Node.js 20: Key Performance Boosts and New FeaturesNode.js 20: Key Performance Boosts and New FeaturesMar 07, 2025 pm 06:12 PM

Node.js 20 significantly enhances performance via V8 engine improvements, notably faster garbage collection and I/O. New features include better WebAssembly support and refined debugging tools, boosting developer productivity and application speed.

How to Share Data Between Steps in CucumberHow to Share Data Between Steps in CucumberMar 07, 2025 pm 05:55 PM

This article explores methods for sharing data between Cucumber steps, comparing scenario context, global variables, argument passing, and data structures. It emphasizes best practices for maintainability, including concise context use, descriptive

How can I implement functional programming techniques in Java?How can I implement functional programming techniques in Java?Mar 11, 2025 pm 05:51 PM

This article explores integrating functional programming into Java using lambda expressions, Streams API, method references, and Optional. It highlights benefits like improved code readability and maintainability through conciseness and immutability

See all articles

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

AI Hentai Generator

AI Hentai Generator

Generate AI Hentai for free.

Hot Article

Repo: How To Revive Teammates
1 months agoBy尊渡假赌尊渡假赌尊渡假赌
R.E.P.O. Energy Crystals Explained and What They Do (Yellow Crystal)
2 weeks agoBy尊渡假赌尊渡假赌尊渡假赌
Hello Kitty Island Adventure: How To Get Giant Seeds
1 months agoBy尊渡假赌尊渡假赌尊渡假赌

Hot Tools

Safe Exam Browser

Safe Exam Browser

Safe Exam Browser is a secure browser environment for taking online exams securely. This software turns any computer into a secure workstation. It controls access to any utility and prevents students from using unauthorized resources.

PhpStorm Mac version

PhpStorm Mac version

The latest (2018.2.1) professional PHP integrated development tool

MinGW - Minimalist GNU for Windows

MinGW - Minimalist GNU for Windows

This project is in the process of being migrated to osdn.net/projects/mingw, you can continue to follow us there. MinGW: A native Windows port of the GNU Compiler Collection (GCC), freely distributable import libraries and header files for building native Windows applications; includes extensions to the MSVC runtime to support C99 functionality. All MinGW software can run on 64-bit Windows platforms.

WebStorm Mac version

WebStorm Mac version

Useful JavaScript development tools

mPDF

mPDF

mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),