I'm not technical. Can I work with iDev?

Absolutely. Most of our clients are non-technical. Just tell us what you want the end result to look like — we handle all the technical details.

How much does it cost to hire iDev?

We quote individually based on project scope and complexity. Initial consultation is completely free — we give you a clear quote after understanding your needs. No fit, no charge.

How big is the iDev team?

A few core members, each capable of delivering full-stack independently. We flexibly assign people based on project scale and can run multiple projects simultaneously.

What happens after project delivery?

We provide complete code and documentation at handover. For ongoing feature development or maintenance, we offer monthly or per-project arrangements. Most clients choose long-term collaboration.

What if I'm not satisfied with the project midway?

We confirm with you at every stage before moving forward. If the direction is off, we adjust immediately. If it truly can't continue, completed work is settled normally and all code is yours.

我完全不懂技术，能合作吗？

当然可以。我们的大部分客户都不是技术背景。你只需要告诉我们你想要什么效果，技术实现的事情完全由我们来处理。

费用大概是多少？

根据项目复杂度和功能范围单独报价。初次沟通完全免费，我们会在了解需求后给出明确报价，合适再开始，不合适不收费。

团队有几个人？

核心团队几个人，都是能独立交付的全栈开发者。根据项目规模灵活安排人手，可以同时推进多个项目，不用等排期。

项目做完以后怎么维护？

交付时会提供完整的代码和文档。后续如果需要功能迭代或维护，可以按月或按次合作。大部分客户选择了长期合作。

做到一半不满意怎么办？

每个阶段交付前都会和你确认。如果方向不对，我们及时调整。如果实在无法继续，已完成的部分正常结算，代码归你。

JDK 21 到 JDK 25：Java 最新特性一文全览

JDK 21 to JDK 25: A Complete Overview of Java's Latest Features

| iDev Team | 2026-07-25T09:00:00

从 JDK 21 的虚拟线程正式发布到 JDK 25 的值类型预览，Java 在过去两年进化飞速。本文梳理每个版本的核心特性，帮你快速跟上节奏。

From JDK 21's official virtual threads to JDK 25's value types preview, Java has evolved rapidly over the past two years. This article covers the core features of each version to help you keep up.

JDK 21（2023.09 LTS）虚拟线程（正式版）：轻量级线程，百万并发不是梦Record Patterns：在 switch 和 instanceof 中解构 RecordPattern Matching for switch（正式版）Sequenced Collections：有序集合的统一接口JDK 22（2024.03）Unnamed Variables：var _ = someMethod()Statements before super()：构造函数中 super() 前可执行语句Stream Gatherers（预览）：自定义 Stream 中间操作JDK 23（2024.09）Primitive Types in Patterns（预览）Structured Concurrency（预览）：结构化并发编程模型Scoped Values（预览）：替代 ThreadLocal 的新方案JDK 24（2025.03）Stream Gatherers（正式版）Compact Object Headers（实验）：对象头从 128 位压缩到 64 位Ahead-of-Time Class Loading：提升启动速度JDK 25（2025.09 LTS）Value Types（预览）：轻量级值对象，减少堆分配Stable Values API：延迟初始化的不可变值Structured Concurrency（正式版预期）升级建议对于企业项目，建议从 JDK 17 直接升级到 JDK 21（LTS），然后在 JDK 25 发布后评估再次升级。注意 JDK 21 移除了部分废弃 API，升级前需检查兼容性。

JDK 21 (2023.09 LTS)Virtual Threads (GA): Lightweight threads enabling millions of concurrent tasksRecord Patterns: Deconstruct Records in switch and instanceofPattern Matching for switch (GA)Sequenced Collections: Unified interface for ordered collectionsJDK 22 (2024.03)Unnamed Variables: var _ = someMethod()Statements before super(): Execute statements before super() in constructorsStream Gatherers (Preview): Custom intermediate Stream operationsJDK 23 (2024.09)Primitive Types in Patterns (Preview)Structured Concurrency (Preview): Structured concurrent programming modelScoped Values (Preview): New alternative to ThreadLocalJDK 24 (2025.03)Stream Gatherers (GA)Compact Object Headers (Experimental): Object headers compressed from 128 to 64 bitsAhead-of-Time Class Loading: Improved startup speedJDK 25 (2025.09 LTS)Value Types (Preview): Lightweight value objects reducing heap allocationStable Values API: Lazily initialized immutable valuesStructured Concurrency (GA expected)Upgrade AdviceFor enterprise projects, we recommend upgrading directly from JDK 17 to JDK 21 (LTS), then evaluating a further upgrade after JDK 25 releases. Note that JDK 21 removed some deprecated APIs — check compatibility before upgrading.

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