java - GC后，对象在内存中的地址变了，为什么对象引用仍然有效？

Question

Java objects are created in Heap and Heap is divided into three parts or generations for sake of garbage collection in Java, these are called as Young generation, Tenured or Old Generation and Perm Area of heap. New Generation is further divided into three parts known as Eden space, Survivor 1 and Survivor 2 space. When an object first created in heap its gets created in new generation inside Eden space and after subsequent Minor Garbage collection if object survives its gets moved to survivor 1 and then Survivor 2 before Major Garbage collection moved that object to Old or tenured generation.

阅读更多:http://javarevisited.blogspot.com/2011/04/garbage-collection-in-java.html#ixzz2MeKK2gBA

所以我的问题是，在这些移动操作之后，内存中的地址应该更改，为什么对象引用仍然有效？

Answer 1

如果 GC 决定移动一个对象，它有责任更新对该对象的所有引用。

这对 Java 程序员来说是透明的:他们可以将引用视为抽象句柄，而不用担心 JVM 如何管理对象存储。