'What is the memory usage of a reference to another object in java?

If for example, I had a linked list of nodes. Each having a field referencing the next node. How much memory does this reference (not the next object) take?

E.g if I have:

Class Node
nextNode node;

public Node(node nextNode){
this.nextNode = nextNode;
}

Does the nextNode field take any memory? If I read correctly, the reference takes 4 bytes, but I'm unsure as I find conflicting information. Thanks!

javamemorymemory-managementreference


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