Programming-Idioms

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[Java] Property name is p. +DocURL

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Idiom #28 Sort by a property

Sort elements of array-like collection items in ascending order of x.p, where p is a field of the type Item of the objects in items.

Sort elements of array-like collection items in ascending order of x.p, where p is a field of the type Item of the objects in items.

import java.util.Collections;
import java.util.Comparator;

import java.util.Collections;
import java.util.Comparator;

Collections.sort(items, new Comparator<Item>(){
	public int compare(Item a, Item b){
		return a.birth - b.birth;
	}
});

Collections.sort(items, new Comparator<Item>(){
	@Override
	public int compare(Item a, Item b){
		return a.p - b.p;
	}
});

items is a List<Item>.
Use an anonymous class which implements Comparator<Item>

items is a List<Item>.
Use an anonymous class which implements Comparator<Item>.

https://docs.oracle.com/javase/8/docs/api/java/util/Comparator.html

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