Why this object with strong reference will be recycled

Question

When I was learning about threadlocal, I was puzzled by its weak reference recycling mechanism, so I have the following test code：

public static void main(String[] args) {
        Car car = new Car(22000, "sliver");
        Entry entry = new Entry(car, new Object());
        int i = 0;

        while (true) {
            if (entry.get() != null) {
                i++;
                System.out.println("Object is alive for " + i + " loops - " + entry);
            } else {
                // Object is alive for 61441 loops - Entry@490d6c15
                // null,java.lang.Object@7d4793a8
                // Object has been collected.
                System.out.println(entry.get() + "," + entry.getValue());
                System.out.println("Object has been collected.");
                break;
            }
        }
    }

class Car {
    private double price;
    private String colour;

    public Car(double price, String colour) {
        this.price = price;
        this.colour = colour;
    }

    public double getPrice() {
        return price;
    }

    public void setPrice(double price) {
        this.price = price;
    }

    public String getColour() {
        return colour;
    }

    public void setColour(String colour) {
        this.colour = colour;
    }
}

class Entry extends WeakReference<Car> {
    Object value;

    Entry(Car k, Object v) {
        super(k);
        value = v;
    }

    public Object getValue() {
        return value;
    }
}

In my computer, it will execute to the else branch after 6W cycles

My question is:

Why entry.get() is return null, there is also a strong reference in front: Car car = new Car(22000, "sliver");