如何对键为模型的哈希图进行排序？

Question

例如，我有Hashmap

Map<EmailCategoryModel, List<EmailBlogDetailsModel>> map;

如何根据键的某些属性对Map进行排序？

Answer 1

使用树形图，这是一个排序的地图，然后使用比较器或类似的接口。代码:

// Use TreeMap like this

TreeMap<EmailCategoryModel, EmailBlogDetailsModel> map = new TreeMap<>(new ComparatorNew());

// And create comparator somewhat like this
class ComparatorNew implements Comparator<EmailCategoryModel> {

    @Override
    public int compare(EmailCategoryModel o1, EmailCategoryModel o2) {
        // Do sorting based on your model attribute here.
        return 0;
    }

}