Declaring as List not ArrayList (03f46a18) · Commits · examples / Head First Java 3rd Edition

src/main/java/Jukebox1.java

+5 −3

Changes for src/main/java/Jukebox1.java: 5 added lines, 3 removed lines.
Original line number	Diff line number	Diff line
		import java.util.*;
		import java.util.ArrayList;
		import java.util.Collections;
		import java.util.List;

		public class Jukebox1 {

		// QU: Should this be a List or ArrayList? Have we covered this?
		ArrayList<String> songList = new ArrayList<>();
		List<String> songList = new ArrayList<>();

		public static void main(String[] args) {
		new Jukebox1().go();
		@@ -23,7 +25,7 @@ public class Jukebox1 {
		// I/O code that the other programmer will provide later

		class Songs {
		public ArrayList<String> getSongs() {
		public List<String> getSongs() {
		ArrayList<String> songDB = new ArrayList<>();
		songDB.add("somersault");
		songDB.add("cassidy");

+2 −2

Changes for src/main/java/Jukebox2.java: 2 added lines, 2 removed lines.
Original line number	Diff line number	Diff line
		import java.util.ArrayList;
		import java.util.Collections;
		import java.util.List;

		public class Jukebox2 {

		@@ -9,7 +9,7 @@ public class Jukebox2 {

		public void go() {
		Songs s = new Songs();
		ArrayList<String> songList = s.getSongs();
		List<String> songList = s.getSongs();
		System.out.println(songList);
		Collections.sort(songList);
		System.out.println("\n" + songList);

+2 −3

Changes for src/main/java/Jukebox3.java: 2 added lines, 3 removed lines.
Original line number	Diff line number	Diff line
		import java.util.*;
		import java.util.List;

		public class Jukebox3 {

		ArrayList<SongV2> mySongs;
		List<SongV2> mySongs;
		MockSongV2File mockFile = new MockSongV2File();

		public static void main(String[] args) {
		new Jukebox3().go();
		}

		public void go() {
		mySongs = mockFile.getSongsV2();
		System.out.println(mySongs);

+2 −2

Changes for src/main/java/Jukebox3Works.java: 2 added lines, 2 removed lines.
Original line number	Diff line number	Diff line
		import java.util.ArrayList;
		import java.util.Collections;
		import java.util.List;

		public class Jukebox3Works {

		ArrayList<SongV3> mySongs;
		List<SongV3> mySongs;
		MockSongV2File mockFile = new MockSongV2File();

		public static void main(String[] args) {

+2 −2

Changes for src/main/java/Jukebox4.java: 2 added lines, 2 removed lines.
Original line number	Diff line number	Diff line
		import java.util.ArrayList;
		import java.util.Collections;
		import java.util.List;

		public class Jukebox4 {

		ArrayList<SongV3> mySongs;
		List<SongV3> mySongs;
		MockSongV2File mockFile = new MockSongV2File();

		public static void main(String[] args) {