File list (Check if you may need any files):
useInterface\Playing\.classpath
............\.......\.project
............\.......\.settings\org.eclipse.jdt.core.prefs
............\.......\bin\Actor.class
............\.......\...\Child.class
............\.......\...\Musician.class
............\.......\...\Playing.class
............\.......\...\UsePlaying.class
............\.......\src\Actor.java
............\.......\...\Child.java
............\.......\...\Musician.java
............\.......\...\Playing.java
............\.......\...\UsePlaying.java
............\.......\.settings
............\.......\bin
............\.......\src
............\Playing
useInterface