如何排序在Java中的ArrayList [英] How to sort an ArrayList in Java

问题描述

我有一个名为水果类我创建这个类的列表和我想基于名字的顺序

i have a class named Fruit i creating a list of this class and add each fruit in each objects i want to sort this list based on the order of 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;
    }
}

和我使用循环创建其列表

and i create 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);
}

和我需要在列表中的每个客体使用的水果名称排序此ArrayList

and i need to sort this arraylist using the fruit name in each objet in the list

如何??

推荐答案

使用比较是这样的：

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);
        }
    });

现在您的水果列表排序依据 fruitName 。

Now your fruits list is sorted based on fruitName.

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