Collection 타입의 소트

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

public class Movie implements Comparable<Movie>
{
 public Movie(String t, String d, Integer r){
  title = t;
  director = d;
  rating = r;
 }

 public int compareTo(Movie m){
  return title.compareTo(m.getTitle());
 }

 public String getTitle(){
  return title;
 }
 public String getDirector(){
  return director;
 }
 public Integer getRating(){
  return rating;
 }

 private String title;
 private String director;
 private Integer rating;
}
class MovieSortTest
{
 public static void main(String[] args){
  ArrayList<Movie> arr = new ArrayList<Movie>();
  arr.add( new Movie("atitle", "cdirector1", new Integer("3")));
  arr.add( new Movie("ztitle", "adirector2", new Integer("2")));
  arr.add( new Movie("ytitle", "bdirector3", new Integer("1")));
  for(Movie m : arr){
   System.out.println("initial value \t\t" + m.getTitle());
  }

  Collections.sort(arr);

  for(Movie a : arr){
   System.out.println( "sorted by compareTo - Title : " + a.getTitle());
  }

  MovieTitleCompare mtitleComp = new MovieTitleCompare();
  Collections.sort(arr, mtitleComp);

  for(Movie a : arr){
   System.out.println( "sorted by compare-Title : " + a.getTitle() + "\t\t" + a.getDirector() + ":" + a.getRating());
  }

  MovieDirectorCompare direcComp = new MovieDirectorCompare();
  Collections.sort(arr, direcComp);
  for(Movie a : arr){
   System.out.println( "sorted by compare - Director : " + a.getDirector()+ "\t\t" + a.getTitle() + ":" + a.getRating());
  }

  MovieRatingCompare rateComp = new MovieRatingCompare();
  Collections.sort(arr, rateComp);
  for(Movie a : arr){
   System.out.println( "sorted by compare - Rating : " + a.getRating()+ "\t\t" +  a.getTitle() + ":" + a.getDirector());
  }

 }

}

class MovieTitleCompare implements Comparator<Movie>
{
 public int compare(Movie m1, Movie m2){
  return m1.getTitle().compareTo(m2.getTitle());
 }
}

class MovieDirectorCompare implements Comparator<Movie>
{
 public int compare(Movie m1, Movie m2){
  return m1.getDirector().compareTo(m2.getDirector());
 }
}

class MovieRatingCompare implements Comparator<Movie>
{
 public int compare(Movie m1, Movie m2){
  return m1.getRating().compareTo(m2.getRating());
 }
}