Java Implements interface

Question

this is my attempt at implementing an interface.

im getting the following error

javac MyCollection.java
./au/edu/uow/Collection/DVDAlbum.java:6: cannot find symbol
symbol: class Album
public class DVDAlbum implements Album{

this is the super class

package au.edu.uow.Collection;
public interface Album {
 String getMediaType();
 String getTitle();
 String getGenre();
}

And this is the sub class

public class DVDAlbum implements Album{
 private String Title;
 private String Genre;
 private String Director;
 private String Plot;
 private String MediaType;
 public DVDAlbum(String TempTitle, String TempGenre, String TempDirector, String TempPlot){
 Title = TempTitle;
 Genre = TempGenre;
 Director = TempDirector;
 Plot = TempPlot;
 }
 String getMediaType(){
 return MediaType;
 }
 String getTitle(){
 return Title;
 }
 String getGenre(){
 return Genre;
 }
}

http://www.javabeginner.com/learn-java/java-abstract-class-and-interface This was the reference i used but its not working for me.

• Vala: Are you importing the interface?
• toniedzwiedz: They're probably in separate packages so you have to use import au.edu.uow.Collection.Album; in the file containing DVDAlbum. BTW, package names should be written in lowercase.
• Mohammod Hossain: check your main class MyCollection

Answer 1

If you aren't in the same package where the interface is declared, you need to import it:

import au.edu.uow.Collection.Album;

Or use the complete qualified name:

public class DVDAlbum implements au.edu.uow.Collection.Album{ }

Answer 2

Add following

import au.edu.uow.Collection.Album;
public class DVDAlbum implements Album{
 //....
}

and

import au.edu.uow.Collection.DVDAlbum;
import au.edu.uow.Collection.Album;
public class MyCollection {
 //....
}

Answer 3

check your interface package is correctly imported.

• Daniel Del Core: if the interface is called Album.java would the import statement be Import Album.java ??
• Heisenbug: Album.java is the file name, not the interface name. You can't use dots in Java class names.

Answer 4

The error message

./au/edu/uow/Collection/DVDAlbum.java:6: cannot find symbol

means, that DVDAlbum and Album are intended to be in the same package and therefore no import is necessary.

BUT: The DVDAlbum is NOT in the right package because the package line is missing. So just copy the package line from Album into DVDAlbum .