https://axerzone.cn/categories/%E8%AE%BE%E8%AE%A1%E6%A8%A1%E5%BC%8F/Recent content in 设计模式 on Weiming's BlogHugo -- gohugo.iozh-cn© 2026 WeimingWed, 15 May 2024 00:00:00 +0000https://axerzone.cn/posts/design-pattern-strategy/Wed, 15 May 2024 00:00:00 +0000https://axerzone.cn/posts/design-pattern-strategy/<h1 class="relative group">策略模式干掉 if-else，代码瞬间清爽 <div id="策略模式干掉-if-else代码瞬间清爽" class="anchor"></div> <span class="absolute top-0 w-6 transition-opacity opacity-0 -start-6 not-prose group-hover:opacity-100 select-none"> <a class="text-primary-300 dark:text-neutral-700 !no-underline" href="#%e7%ad%96%e7%95%a5%e6%a8%a1%e5%bc%8f%e5%b9%b2%e6%8e%89-if-else%e4%bb%a3%e7%a0%81%e7%9e%ac%e9%97%b4%e6%b8%85%e7%88%bd" aria-label="锚点">#</a> </span> </h1> <h2 class="relative group">if-else 地狱 <div id="if-else-地狱" class="anchor"></div> <span class="absolute top-0 w-6 transition-opacity opacity-0 -start-6 not-prose group-hover:opacity-100 select-none"> <a class="text-primary-300 dark:text-neutral-700 !no-underline" href="#if-else-%e5%9c%b0%e7%8b%b1" aria-label="锚点">#</a> </span> </h2> <p>你写过这种代码吗：</p>https://axerzone.cn/posts/singleton-patterns/Sat, 10 Dec 2022 00:00:00 +0000https://axerzone.cn/posts/singleton-patterns/<h1 class="relative group">单例模式的几种写法，你用哪种？ <div id="单例模式的几种写法你用哪种" class="anchor"></div> <span class="absolute top-0 w-6 transition-opacity opacity-0 -start-6 not-prose group-hover:opacity-100 select-none"> <a class="text-primary-300 dark:text-neutral-700 !no-underline" href="#%e5%8d%95%e4%be%8b%e6%a8%a1%e5%bc%8f%e7%9a%84%e5%87%a0%e7%a7%8d%e5%86%99%e6%b3%95%e4%bd%a0%e7%94%a8%e5%93%aa%e7%a7%8d" aria-label="锚点">#</a> </span> </h1> <h2 class="relative group">为什么需要单例 <div id="为什么需要单例" class="anchor"></div> <span class="absolute top-0 w-6 transition-opacity opacity-0 -start-6 not-prose group-hover:opacity-100 select-none"> <a class="text-primary-300 dark:text-neutral-700 !no-underline" href="#%e4%b8%ba%e4%bb%80%e4%b9%88%e9%9c%80%e8%a6%81%e5%8d%95%e4%be%8b" aria-label="锚点">#</a> </span> </h2> <p>单例模式大概是最简单也最常被问到的设计模式了。面试必问，但你真的理解每种写法的区别吗？</p> <p>先说为什么需要单例。有些对象全局只需要一个就够了，比如线程池、数据库连接池、配置管理器。你不希望到处 new，浪费资源不说，状态不一致更头疼。</p>