Are there any links that demonstrate the work of a garbage collector?

Yes, it is possible to create examples demonstrating the impact of the garbage collector.

// Example 1: Creating a large number of objects

public class GarbageCollectionDemo1 {

    public static void main(String[] args) {
        List<DummyObject> objects = new ArrayList<>();
        for (int i = 0; i < 1000000; i++) {
            objects.add(new DummyObject(i)); // Creating many objects
        }
        // At this point, the garbage collector may be invoked to free memory
        // if the objects in the list are no longer used elsewhere.
        // Even if not explicitly called, it will run when needed.

        // Clearing the list potentially frees memory
        objects.clear(); 

        System.gc(); // Explicit request for garbage collection (not guaranteed to execute)
    }

    static class DummyObject {
        private int id;

        public DummyObject(int id) {
            this.id = id;
        }

        @Override
        protected void finalize() throws Throwable {
            // The finalize method is called before garbage collection (not guaranteed and not recommended)
            // System.out.println("Collecting object with id: " + id);
        }
    }
}

// Example 2: Nullifying references

public class GarbageCollectionDemo2 {

    public static void main(String[] args) {
        Object obj = new Object(); // Creating an object
        System.out.println("Object created."); 

        obj = null; // Removing the reference to the object. It is now eligible for garbage collection.
        System.out.println("Reference to object set to null.");

        System.gc(); // Explicit request for garbage collection
    }
}

These examples demonstrate how creating many objects or removing references makes objects available for garbage collection. It is important to understand that calling System.gc() does not guarantee immediate garbage collection; the JVM decides when to run it based on its internal algorithms.