安卓排序数组列表按属性

sorting android java arraylist

2022-08-31 14:37:43

我想按属性排序。这是我的代码...ArrayList

public class FishDB{

    public static Object Fish;
    public ArrayList<Fish> list = new ArrayList<Fish>();

    public class Fish{
        String name;
        int length;
        String LatinName;
        //etc. 

        public Vis (String name) {
            this.name = name;
        }
    }

    public FishDB() {
        Fish fish;

        fish = new Fish("Shark");
        fish.length = 200;
        fish.LatinName = "Carcharodon Carcharias";

        fish = new Fish("Rainbow Trout");
        fish.length = 80;
        fish.LatinName = "Oncorhynchus Mykiss";

        //etc.
        }
    }
}

现在我想在想按属性排序，例如在另一个活动中。但我不知道该怎么做。有人知道怎么做吗？ArrayListlatinname

答案 1

例如，您需要实现一个：Comparator

public class FishNameComparator implements Comparator<Fish>
{
    public int compare(Fish left, Fish right) {
        return left.name.compareTo(right.name);
    }
}

然后像这样排序：

Collections.sort(fishes, new FishNameComparator());

答案 2

您只需通过以下代码即可完成此操作：

Collections.sort(list, new Comparator<Fish>() {
    public int compare(Fish o1, Fish o2) {
        return o1.name.compareTo(o2.name);
    }
});