Java 8 Example - Sort without Lambda

Example to compare the Developer objects using their age. Normally, you use Collections.sort and pass an anonymous Comparator class like this :

package com.javaschool.java8;

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

public class TestSorting {

 public static void main(String[] args) {

  List listDevs = getDevelopers();

  System.out.println("Before Sort");
  for (Developer developer : listDevs) {
   System.out.println(developer);
  }

  //sort by age
  Collections.sort(listDevs, new Comparator() {
   @Override
   public int compare(Developer o1, Developer o2) {
    return o1.getAge() - o2.getAge();
   }
  });

  System.out.println("After Sort");
  for (Developer developer : listDevs) {
   System.out.println(developer);
  }

 }

 private static List getDevelopers() {

  List result = new ArrayList();

  result.add(new Developer("java", new BigDecimal("70000"), 33));
  result.add(new Developer("school", new BigDecimal("80000"), 20));
  result.add(new Developer("java8", new BigDecimal("100000"), 10));
  result.add(new Developer("blog", new BigDecimal("170000"), 55));

  return result;

 }

}

Output:

Before Sort
Developer [name=java, salary=70000, age=33]
Developer [name=school, salary=80000, age=20]
Developer [name=java8, salary=100000, age=10]
Developer [name=blog, salary=170000, age=55]

After Sort
Developer [name=java, salary=100000, age=10]
Developer [name=school, salary=80000, age=20]
Developer [name=java8, salary=70000, age=33]
Developer [name=blog, salary=170000, age=55]