如何在 Java 中对 ArrayList 进行排序 [英] How to sort an ArrayList in Java

问题描述

我有一个名为 Fruit 的类.我正在创建这个类的列表并在列表中添加每个水果.我想根据水果名称的顺序对这个列表进行排序.

I have a class named Fruit. I am creating a list of this class and adding each fruit in the list. I want to sort this list based on the order of fruit name.

public class Fruit{

    private String fruitName;
    private String fruitDesc;
    private int quantity;

    public String getFruitName() {
        return fruitName;
    }
    public void setFruitName(String fruitName) {
        this.fruitName = fruitName;
    }
    public String getFruitDesc() {
        return fruitDesc;
    }
    public void setFruitDesc(String fruitDesc) {
        this.fruitDesc = fruitDesc;
    }
    public int getQuantity() {
        return quantity;
    }
    public void setQuantity(int quantity) {
        this.quantity = quantity;
    }
}

我正在使用 for 循环创建它的列表

and I am creating its list using for loop

List<Fruit>  fruits= new ArrayList<Fruit>();

Fruit fruit;
for(int i=0;i<100;i++)
{
   fruit = new fruit();
   fruit.setname(...);
   fruits.add(fruit);
}

我需要使用列表中每个对象的水果名称对这个 arrayList 进行排序

and I need to sort this arrayList using the fruit name of each object in the list

怎么样??

推荐答案

像这样使用 Comparator:

List<Fruit> fruits= new ArrayList<Fruit>();

Fruit fruit;
for(int i = 0; i < 100; i++)
{
  fruit = new Fruit();
  fruit.setname(...);
  fruits.add(fruit);
}

// Sorting
Collections.sort(fruits, new Comparator<Fruit>() {
        @Override
        public int compare(Fruit fruit2, Fruit fruit1)
        {

            return  fruit1.fruitName.compareTo(fruit2.fruitName);
        }
    });

现在您的水果列表是根据 fruitName 排序的.

Now your fruits list is sorted based on fruitName.

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