Package Inside Package Java

Question

I've been given the instructions: Write an interface called Playable, with a method void play();. Let this interface be placed in a package called music.Write a class called Veena which implements Playable interface. Let this class be placed in a package music.string.

I have created the interface and packaged it below:

package music; interface Playable { public void play(); }

I then created the next class below:

package music.string; import music.Playable; public class Veena implements Playable { public void play() { System.out.println("Veena plays"); } }

I've played around with this and so far, I either don't get to name the package it's in to "music.string" or I receive an error since Playable is not public and cannot be used outside the interface. How would I import and implement Playable in my class Veena while also packaging Veena in "music.string"?

"Playable is not public and cannot be used outside the interface" - the compiler is telling you what's wrong. Read up about Java access modifiers: docs.oracle.com/javase/tutorial/java/javaOO/accesscontrol.html — David Lavender
– David Lavender, Commented Jan 25, 2018 at 16:09

davidxxx · Accepted Answer · 2018-01-25 16:07:48Z

1

Make the interface public :

public interface Playable { void play(); }

A package-private class/interface may only be referenced by classes/interfaces belonging to the exact same package.

answered Jan 25, 2018 at 16:07

davidxxx

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3 Comments

JMV12 Over a year ago

Oh wow... I kept making that change and wondering why it wasn't working. It just occurred to me that I have to recompile Playable.java before compiling Veena.java. I'm so sorry for the stupid question.

davidxxx Over a year ago

Don't be sorry and thanks for the feedback :) But I don't really understand that it may work. Are you sure that you use the default access modifier for Playable and that Playable and Veena are in two distinct packages ? The compile could not success in these conditions.

JGlass Over a year ago

Also, depending on your IDE, if one project is set as a dependency of the other and auto build is selected, it will automatically build both prior to running.

Kushagra Misra · Accepted Answer · 2018-01-25 16:14:43Z

you cannot access interface from different package in case it is not defined public. If you want to keep your interface default you have to move your classes to same package, but as you have an requirement to keep your interface in separate package(which is a good design also) make your interface public.

package music; public interface Playable { void play(); }

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