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Update memory-area.md
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@ -131,7 +131,7 @@ Java 堆是垃圾收集器管理的主要区域，因此也被称作 **GC 堆（
MaxTenuringThreshold of 20 is invalid; must be between 0 and 15
```
**为什么年龄只能是 0-15? **
**为什么年龄只能是 0-15?**
因为记录年龄的区域在对象头中，这个区域的大小通常是 4 位。这 4 位可以表示的最大二进制数字是 1111，即十进制的 15。因此，对象的年龄被限制为 0 到 15。