Comparator

Person Class
=========
package Cls;

public class Person {

    public String name;
    public int height;
    public int weight;

    public Person(String name, int height, int weight) {
        this.name = name;
        this.height = height;
        this.weight = weight;
    }

    public String getName() {
        return name;
    }

    public int getHeight() {
        return height;
    }

    public int getWeight() {
        return weight;
    }

    @Override
    public String toString() {
        return "Person{" +
                "name='" + name + '\'' +
                ", height=" + height +
                ", weight=" + weight +
                '}';
    }
}

=======
package Cls;

import java.util.Comparator;

public class ComparePersonByName implements Comparator<Person>{

    @Override
    public int compare(Person p1, Person p2) {

        return p1.getName().compareTo(p2.getName());
    }
}

========
package Cls;

import java.util.Comparator;

public class ComparePersonByHeight implements Comparator<Person> {

    @Override
    public int compare(Person p1, Person p2) {


        if(p1.getHeight() < p2.getHeight()){
            return -1;
        }else if(p1.getHeight() > p2.getHeight()){
            return 1;
        }else{
            return 0;
        }
    }
}

========

package Cls;

import java.util.Comparator;

public class ComparePersonByWeight implements Comparator<Person> {

    @Override
    public int compare(Person p1, Person p2) {
        if(p1.getWeight() < p2.getWeight()){
            return -1;
        }else if(p1.getWeight() > p2.getWeight()){
            return 1;
        }else{
            return 0;
        }

    }



}
========

package Tester;

import Cls.ComparePersonByHeight;
import Cls.ComparePersonByName;
import Cls.ComparePersonByWeight;
import Cls.Person;

import java.util.LinkedHashSet;
import java.util.Set;
import java.util.TreeSet;

public class tester {
    public static void main(String[] args) {

        Person p1 = new Person("Mike", 173, 70);
        Person p2 = new Person("Omri", 170, 50);
        Person p3 = new Person("Aya", 165, 75);
        Person p4 = new Person("David", 169, 60);
        Person p5 = new Person("Max", 180, 80);

        Set<Person> persons = new LinkedHashSet<Person>();


        persons.add(p1);
        persons.add(p2);
        persons.add(p3);
        persons.add(p4);
        persons.add(p5);


        Set[] sortedPersons = new Set[3];
        sortedPersons[0] = new TreeSet<Person>(new ComparePersonByName());
        sortedPersons[1] = new TreeSet<Person>(new ComparePersonByHeight());
        sortedPersons[2] = new TreeSet<Person>(new ComparePersonByWeight());

        for (int i=0; i<sortedPersons.length; i++){

            sortedPersons[i].add(p1);
            sortedPersons[i].add(p2);
            sortedPersons[i].add(p3);
            sortedPersons[i].add(p4);
            sortedPersons[i].add(p5);

        }

        System.out.println("sorted by name: " + sortedPersons[0]);
        System.out.println("sorted by height: " + sortedPersons[1]);
        System.out.println("sorted by weight: " + sortedPersons[2]);


    }
}