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issue552https://github.com/Snailclimb/JavaGuide/issues/552
Default Java 8 max heap sizehttps://stackoverflow.com/questions/28272923/default-xmxsize-in-java-8-max-heap-size
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JVM 常量池中存储的是对象还是引用呢？ - RednaxelaFX - 知乎https://www.zhihu.com/question/57109429/answer/151717241
《深入理解 Java 虚拟机（第 3 版）》样例代码&勘误https://github.com/fenixsoft/jvm_book
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https://github.com/StarJava999/JavaGuide/blob/main/docs/java/jvm/memory-area.md#参考
https://docs.oracle.com/javase/specs/jvms/se8/html/jvms-2.htmlhttps://docs.oracle.com/javase/specs/jvms/se8/html/jvms-2.html
https://chenxitag.com/archives/368https://chenxitag.com/archives/368
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https://www.zhihu.com/question/57109429/answer/151717241https://www.zhihu.com/question/57109429/answer/151717241
http://www.pointsoftware.ch/en/under-the-hood-runtime-data-areas-javas-memory-model/http://www.pointsoftware.ch/en/under-the-hood-runtime-data-areas-javas-memory-model/
https://dzone.com/articles/jvm-permgen-%E2%80%93-where-art-thouhttps://dzone.com/articles/jvm-permgen-%E2%80%93-where-art-thou
https://stackoverflow.com/questions/9095748/method-area-and-permgenhttps://stackoverflow.com/questions/9095748/method-area-and-permgen
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