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Start your free trialBrian Bartholomew
1,741 PointsList.sort() does not exist in Java 7, what other methods could be used?
I am learning java for work. We have legacy software and use Java 7. List.sort() was introduced in Java 8. Hence, my compiling error:
Error:(81, 10) java: cannot find symbol
symbol: method sort(<anonymous java.util.Comparator<com.teamtreehouse.model.Song>>)
location: variable songs of type java.util.List<com.teamtreehouse.model.Song>
I was thinking that refactoring the List
to be a Tree
of some sort would help the alphabetizing.
Is there a simpler way?
2 Answers
Juan Chavez
2,995 PointsI fixed this using
List<Song> songs = byArtist().get(artistName);
Collections.sort(songs,new Comparator<Song>() {
@Override
public int compare(Song song1, Song song2) {
if (song1.equals(song2)) {
return 0;
}
return song1.mTitle.compareTo(song2.mTitle);
}
});
instead of
songs.sort(new Comparator<Song>() {
@Override
public int compare(Song song1, Song song2) {
if (song1.equals(song2)) {
return 0;
}
return song1.mTitle.compareTo(song2.mTitle);
}
});
jesdavpet
21,489 PointsFor earlier versions of Java I think you can use Collections in the java.util package instead.
Collections.sort( myComparableList );
http://docs.oracle.com/javase/7/docs/api/java/util/Collections.html