笔记备份：2025-08-20 22:07:36

.obsidian/plugins/keep-the-rhythm/data.json

@@ -529,11 +529,11 @@
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.obsidian/plugins/novel-word-count/data.json

@@ -463,20 +463,20 @@
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A1-Work/语言/Java/基础学习.md

@@ -479,6 +479,8 @@ public class Test {
 ### 通配符类型
 长这样：`<? extends Object>`，和 `<T extends Object>` 很像，还有一个 `<? super Object>`。`extends` 表示该类的子类，`super` 表示该类的父类。
 
+直观的讲，带有父类型限定的通配符可以向泛型对象写入，带有子类型限定的通配符可以从泛型对象读取。
+
 ## JDK 特性
 
 ### JDK7