Can cyclic dependencies lead to memory leaks in a program?

Yes, cyclic dependencies can lead to memory leaks, especially in languages with automatic memory management, such as Java.

In Java, the garbage collector uses algorithms based on object reachability. If a group of objects references each other (creating a cycle), but are unreachable from root objects (such as from the stack or static variables), the garbage collector can clean them up.

However, if cyclic dependencies are accompanied by external resources or if references are held in static collections or caches, objects may remain in memory longer than necessary, effectively causing a memory leak.

Example:

class Node {
    Node next;
}

Node a = new Node();
Node b = new Node();
a.next = b;
b.next = a; // cyclic reference

// If 'a' and 'b' are no longer used and are not accessible from other parts of the program,
// the garbage collector can clean them up.
// But if they are stored in a static collection, the cycle will keep them in memory.

Thus, cyclic dependencies themselves do not always cause leaks, but combined with improper reference management, they can prevent objects from being freed.