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Snailclimb avatar Snailclimb commented on June 1, 2024

直接内存最后一段：堆外内存就是把内存对象分配在堆（新生代+老年代+永久代）以外的内存，这些内存直接受操作系统管理（而不是虚拟机），这样做的结果就是能够在一定程度上减少垃圾回收对应用程序造成的影响。 这里“对象分配在堆（新生代+老年代+永久代）”，其中永久代并不是堆内存的一部分，根据《深入理解Java虚拟机（第3版）》中的描述，“HotSpot本质上这两者并不是等价的，因为仅仅是当时的HotSpot虚拟机设 计团队选择把收集器的分代设计扩展至方法区，或者说使用永久代来实现方法区而已，这样使得 HotSpot的垃圾收集器能够像管理Java堆一样管理这部分内存，省去专门为方法区编写内存管理代码的 工作。”。我理解，堆应该是新生代+老年代，而不应该是新生代+老年代+永久代

感谢指出，这里忘记同步修改了。

from javaguide.

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