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;
}
}
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);
}
and I need to sort this arrayList using the fruit name of each object in the list
how??
This question is related to
java
sorting
collections
arraylist
Use a Comparator like this:
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);
}
});
Now your fruits list is sorted based on fruitName.
Try BeanComparator from Apache Commons.
import org.apache.commons.beanutils.BeanComparator;
BeanComparator fieldComparator = new BeanComparator("fruitName");
Collections.sort(fruits, fieldComparator);
Implement Comparable interface to Fruit.
public class Fruit implements Comparable<Fruit> {
It implements the method
@Override
public int compareTo(Fruit fruit) {
//write code here for compare name
}
Then do call sort method
Collections.sort(fruitList);
Source: Stackoverflow.com