您应该简单地委托已经提供的枚举compareTo（）方法，并反映声明顺序（基于 ordinal value）：

You should simply delegate to the enum compareTo() method which is already provided and reflects the declaration order (based on the ordinal value):

Collections.sort(list, new Comparator() {
    @Override
    public int compare(A a1, A a2) {
        return a1.getType().compareTo(a2.getType());
    }
});

或者，如果您认为组件类型为您的元素提供自然顺序，您可以使A类本身实现 Comparable ，并将 compareTo 方法委托给 ComponentType 一。

Or, if you think that the component type provides the "natural order" for your elements, you can make the A class itself implement Comparable and also delegate the compareTo method to the ComponentType one.