The difference between comparable and comparator....

Compare

package com.westudio.java;


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

class HDTV implements Comparable<HDTV> {

    private int size;
    private String brand;

    public HDTV(int size, String brand) {
        this.size = size;
        this.brand = brand;
    }

    int getSize() {
        return size;
    }

    void setSize(int size) {
        this.size = size;
    }

    String getBrand() {
        return brand;
    }

    void setBrand(String brand) {
        this.brand = brand;
    }

    @Override
    public int compareTo(HDTV o) {
        if (this.size > o.size) {
            return 1;
        } else if (this.size < o.size) {
            return -1;
        }

        return 0;
    }
}

class Computer {
    private int price;
    private String brand;

    public Computer(int price, String brand) {
        this.price = price;
        this.brand = brand;
    }

    int getPrice() {
        return price;
    }

    void setPrice(int price) {
        this.price = price;
    }

    String getBrand() {
        return brand;
    }

    void setBrand(String brand) {
        this.brand = brand;
    }
}

class PriceComparator implements Comparator<Computer> {

    @Override
    public int compare(Computer c1, Computer c2) {
        int priceOne = c1.getPrice();
        int priceTwo = c2.getPrice();

        if (priceOne > priceTwo) {
            return 1;
        } else if (priceOne < priceTwo) {
            return -1;
        }

        return 0;
    }
}

public class Compare {

    public static void main(String[] args) {
        HDTV tvOne = new HDTV(55, "Samsung");
        HDTV tvTwo = new HDTV(58, "Sony");

        if (tvOne.compareTo(tvTwo) > 0) {
            System.out.println("Samsung is better");
        } else {
            System.out.println("Sony is better");
        }

        Computer c1 = new Computer(6000, "Sony");
        Computer c2 = new Computer(7000, "Lenovo");
        Computer c3 = new Computer(8000, "Apple");

        ArrayList<Computer> list = new ArrayList<Computer>();
        list.add(c1);
        list.add(c2);
        list.add(c3);

        Collections.sort(list, new PriceComparator());

        for (Computer c : list) {
            System.out.println(c.getBrand());
        }
    }
}