关于优先队列的疑惑

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#1 Created at ... [Delete] [Delete and Lock User]

我把Bob改为A3后

q.offer(new User("Bob", "A3"));
        q.offer(new User("Alice", "A2"));
        q.offer(new User("Boss", "V1"));

输出是

Boss/V1
Alice/A2
Bob/A3
null

我感觉现在这个优先队列已经丧失了队列先进先出的特性了，纯粹变成了靠compare的结果来判断输出先后顺序的集合了，这样的话还能算队列吗

#2 Created at ... [Delete] [Delete and Lock User]

蠢了，当我没问

#3 Created at ... [Delete] [Delete and Lock User]

我没看懂啊，解释一下，我感觉是按照比较结果出的值啊