[Ch10b] Moving what was Jukebox5 into Jukebox4, and bringing it inline with what went before

package ch10b;

import java.util.ArrayList;

import java.util.Collections;

import java.util.Comparator;

import java.util.List;

public class Jukebox5 {

  List<SongV3> songList = new ArrayList<>();

  MockSongV3File mockFile = new MockSongV3File();

import java.util.*;

public class Jukebox4 {

  public static void main(String[] args) {

    new Jukebox5().go();

    new Jukebox4().go();

  }

  public void go() {

    songList = mockFile.getSongsV3();

    List<SongV3> songList = MockSongs.getSongsV3();

    System.out.println(songList);

    Collections.sort(songList);

    System.out.println(songList);

    ArtistCompare artistCompare = new ArtistCompare();

    songList.sort(artistCompare);

    System.out.println(songList);