Java8使用方法引用按2个字段排序

I have below class :

我有以下课程:

public class Item {
    String name;
    double price;
    // Getters & Setters
}

I can compare using lambda like this:

我可以像这样使用lambda进行比较:

Collections.sort(items, (Item o1, Item o2) -> {
            int result = Double.valueOf(o2.getPrice()).compareTo(o1.getPrice());
            if (result == 0) {
                return o1.getName().compareTo(o2.getName());
            }
            return result;
        });

I want to use method reference for comparing elements but I want to compare by name fist and then using price. How can I achieve this?

我想使用方法参考来比较元素,但我想通过名称比较然后使用价格进行比较。我怎样才能做到这一点?

Also is there a simplified way of using lambda here?

还有一种在这里使用lambda的简化方法吗?

1 个解决方案

#1

You can use the Comparator::comparing and Comparator::comparingDouble method to easily create a compartor on the fly:

您可以使用Comparator :: comparison和Comparator :: comparisonDouble方法轻松创建动态隔离专区:

List<Item> items = ...;
items.sort(Comparator.comparing(Item::getName).thenComparingDouble(Item::getPrice));