java – 引用数组索引是否会产生内存泄漏？

以下是代码段.

//Can you spot the "memory leak"?
public class Stack {
    private Object[] elements;
    private int size = 0;
    private static final int DEFAULT_INITIAL_CAPACITY = 16;

    public Stack() {
        elements = new Object[DEFAULT_INITIAL_CAPACITY];
    }

    public void push(Object e) {
        ensureCapacity();
        elements[size++] = e;
    }

    public Object pop() {
        if (size == 0)
            throw new EmptyStackException();
        return elements[--size];
    }

    /**
     * Ensure space for at least one more element,roughly doubling the capacity
     * each time the array needs to grow.
     */
    private void ensureCapacity() {
        if (elements.length == size)
            elements = Arrays.copyOf(elements,2 * size + 1);
    }
}

根据这个项目,内存泄漏是因为在弹出之后,数组索引没有被引用为NULL,如下所示：

public Object pop() {
    if (size == 0)
        throw new EmptyStackException();
    Object result = elements[--size];
    elements[size] = null; // Eliminate obsolete reference
    return result;
}

我的理解是假设对于给定的数组,我已经完成了元素[0] = new Object()然后我再次执行这个元素[0] = new Object()然后我的第一个对象将有资格进行垃圾收集,因为0th我的数组的索引不再指向它.

我的理解不正确吗？如果它是正确的,那么它如何在Effective Java中显示为内存泄漏.