altoslib: Make AltosPreferencesBackend abstract. Add set/put Serializable

[fw/altos] / altosuilib / AltosUIPreferencesBackend.java

diff --git a/altosuilib/AltosUIPreferencesBackend.java b/altosuilib/AltosUIPreferencesBackend.java
index 9d3f15a20081ee0277740b690c867e9d7bde30a5..d232edf7a373bd496b83467c75dd96f96c15fd57 100644 (file)
--- a/altosuilib/AltosUIPreferencesBackend.java
+++ b/altosuilib/AltosUIPreferencesBackend.java
@@ -22,7 +22,7 @@ import java.util.prefs.*;
 import org.altusmetrum.altoslib_10.*;
 import javax.swing.filechooser.FileSystemView;
 
-public class AltosUIPreferencesBackend implements AltosPreferencesBackend {
+public class AltosUIPreferencesBackend extends AltosPreferencesBackend {
 
        private Preferences _preferences = null;