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Java内存回收.md 如何判断一个常量是废弃常量描述不正确 #952

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wardseptember opened this issue Oct 12, 2020 · 0 comments
Open

Java内存回收.md 如何判断一个常量是废弃常量描述不正确 #952

wardseptember opened this issue Oct 12, 2020 · 0 comments

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@wardseptember
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@wardseptember wardseptember commented Oct 12, 2020

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运行时常量池主要回收的是废弃的常量。那么，我们如何判断一个常量是废弃常量呢？

假如在常量池中存在字符串 "abc"，如果当前没有任何 String 对象引用该字符串常量的话，就说明常量 "abc" 就是废弃常量，如果这时发生内存回收的话而且有必要的话，"abc" 就会被系统清理出常量池。

字符串常量池已经在堆中开辟一块空间存储了，运行时常量池里面没有字符串常量了。回收方法区更谈不上回收字符串常量池了，这里是有点小问题的。
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