Compare two integers print value ascending or descending order

Compare two integers print value ascending or descending order

Below demo will show you how to compare two integers print value ascending or descending order . We will use Comparator interface to compare value and Collections class sort method to print value:

package com.javahonk.algorithms;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;

public class SortingTest implements Comparator<Integer> {

	static Boolean ascending = false;	

	public static void main(String[] args) {

	List<Integer> list = new ArrayList<Integer>();
	list.add(1);
	list.add(5);
	list.add(3);
	list.add(4);
	list.add(2);

	System.out.println("Unsorted list: " + list);
	// Sort list in descending order
	Collections.sort(list, new SortingTest());

	System.out.println("\nSorted list descending order: " + list);

	//Sort list in ascending order:
	SortingTest.ascending = true;
	Collections.sort(list, new SortingTest());
	System.out.println("\nSorted list ascending order: " + list);
	}

	@Override
	public int compare(Integer o1, Integer o2) {
		if (ascending) {
			return o1.intValue() - o2.intValue();
		} else {
			return o2.intValue() - o1.intValue();
		}

	}

}

 

Output:

Compare two integers print value ascending or descending order

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