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How will you sort objects by Natural order in a Java List?

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Pragya Keshap answered on February 4, 2023 Popularity 2/10 Helpfulness 1/10

answer How will you sort objects by Natural order in a Java List?

How will you sort objects by Natural order in a Java List?

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We can use Collections.sort method to sort the elements of a List in

natural order. To use this method, we have to make sure that element

objects implement compareTo() method.

We can also use a Comparator to define the natural ordering for

elements of a List. Then we can use this Custom Comparator in sort

method of Collections class

public class JavaSortListObject {

	public static void main(String[] args) {
		List<Data> dl = new ArrayList<>();
		dl.add(new Data(2));
		dl.add(new Data(3));
		dl.add(new Data(1));
		System.out.println("Original List::"+dl);
		Collections.sort(dl);
		System.out.println("Naturally Sorted List::"+dl);

	}

}

class Data implements Comparable<Data> {

	private int id;

	public Data(int i) {
		this.id = i;
	}

	@Override
	public int compareTo(Data d) {
		return this.id - d.getId();
	}

	public int getId() {
		return id;
	}

	@Override
	public String toString() {
		return "Data{"+this.id+"}";
	}
}

https://www.digitalocean.com/community/tutorials/java-sort-list

Popularity 2/10 Helpfulness 1/10 Language java

Source: Grepper

Tags: java

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Contributed on Feb 04 2023

Pragya Keshap

0 Answers Avg Quality 2/10

How will you sort objects by Natural order in a Java List?

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