Can the JVM GC move objects in the middle of a reference comparison, causing a comparison to fail even when both sides refer to the same object?

Question

It\'s well known that GCs will sometimes move objects around in memory. And it\'s to my understanding that as long as all references are updated when the object is moved (before

Answer 1

Java object hold a reference to the "object" not to the memory space where the object is stored.

Java do this because it allow the JVM to manage memory usage by its own (e.g. Garbage collector) and to improve global usage without impacting the client program directly.

As instance for improvement, the first X int (I don't remember how much) are always allocated in memory to execute for loop fatser (ex: for (int i =0; i<10; i++))

And as example for object reference, just try to create an and try to print it

int[] i = {1,2,3};
System.out.println(i);

You will see that Java returning a something starting with [I@. It is saying that is point on a "array of int at" and then the reference to the object. Not the memory zone!