如何在 Java 中对 ArrayList 进行排序 [英] How to sort an ArrayList in Java
本文介绍了如何在 Java 中对 ArrayList 进行排序的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
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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