https://axerzone.cn/tags/%E6%B3%9B%E5%9E%8B/Recent content in 泛型 on Weiming's BlogHugo -- gohugo.iozh-cn© 2026 WeimingSat, 12 Aug 2023 00:00:00 +0000https://axerzone.cn/posts/java-generics/Sat, 12 Aug 2023 00:00:00 +0000https://axerzone.cn/posts/java-generics/<h1 class="relative group">Java 泛型这几个坑你肯定踩过 <div id="java-泛型这几个坑你肯定踩过" 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="#java-%e6%b3%9b%e5%9e%8b%e8%bf%99%e5%87%a0%e4%b8%aa%e5%9d%91%e4%bd%a0%e8%82%af%e5%ae%9a%e8%b8%a9%e8%bf%87" aria-label="锚点">#</a> </span> </h1> <p>Java 泛型这东西，看着简单用着顺手，直到踩坑才发现自己根本没搞懂。上周写作业一个泛型编译错误折腾了我一个多小时，气得把泛型重新学了一遍。</p> <h2 class="relative group">类型擦除到底擦了啥 <div id="类型擦除到底擦了啥" 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%b1%bb%e5%9e%8b%e6%93%a6%e9%99%a4%e5%88%b0%e5%ba%95%e6%93%a6%e4%ba%86%e5%95%a5" aria-label="锚点">#</a> </span> </h2> <p>Java 的泛型是假泛型。编译之后泛型信息就没了，全变成 Object（或上界类型），这叫类型擦除。</p>