package mobile;

    /**
     * @param args the command line arguments
     */

    public static void main(String[] args) {

public class Mobile {
    int volume = 0;
    int ringtone = 0;

void volumeUp (int increment){
    volume = volume + increment;
}
void changeringtone (int newValue){
    ringtone = newValue;
}
void volumeDown (int decrement){
    volume = volume - decrement;
}
void printStates(){
    System.out.println("ringtone:" + ringtone + "volume:" + volume);
}

java.lang.NoClassDefFoundError: mobile/Mobile (wrong name: mobile/mobile)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)
at java.lang.ClassLoader.defineClass(ClassLoader.java:615)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)

public class Mobile {
    //Variables declarations
    //Instance blocks etc.,
     public static void main(String[] args) {

//Your code here
 }

}

public class Me {
  public static void main(String[] args) {
    Mobile myPhone = new Nokia();  // we "buy" a mobile
    myPhone.setVolume(11);         // that's more then 10 ;)
  }
}

public interface Mobile {
  void setVolume(int level);  // as an example
}

public class Nokia implements Mobile {
  // (1) a constructor
  // (2) implementations for all methods defined on Mobile
}