CODEWITHSUNDEEP
javagenerics
Macmanmatty
Macmanmatty

Reputation: 23

Defining Java Generic Type at Class Declaration

I Have 

public class SongListView<T>  extends ListView<T>

How Can I specify that the Generic Type T is to be a Song Object and no other object?

Upvotes: 0

Views: 61

Answers (1)

kozmo
kozmo

Reputation: 4471

public class SongListView extends ListView<Song> {...}

you can add to ListView only Song-instance (can not add heirs of Song.class)

ListView<Song> songListView = new SongListView();

also you can not assign SongListView to generic reference of other heirs of of Song.class

class LongSong extends Song {...}
ListView<LongSong> songListView = new SongListView(); //Incompatible types.

Upvotes: 1

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