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public class BasicInteger
{
   private int value;
   public BasicInteger (int v)
   {
      setValue (v);
   }
   protected void setValue (int v)
   {
      value = v;
   }
   public String toString()
   {
      return String.valueOf (value);
   }
}
public class EnhancedInteger extends BasicInteger
{
   public EnhancedInteger (int v)
   {
      super (v);
   }
   public void change (BasicInteger bi)
   {
      super.setValue (bi.value);
   }
}
public class Test
{
   public static void main (String[] args)
   {
      EnhancedInteger a = new EnhancedInteger (12);
      BasicInteger b = new BasicInteger (8);
      a.add (b);
      System.out.println ("Valeur : " + a);
   }
}

Main.java:1: error: class BasicInteger is public, should be declared in a file named BasicInteger.java
public class BasicInteger
       ^
Main.java:17: error: class EnhancedInteger is public, should be declared in a file named EnhancedInteger.java
public class EnhancedInteger extends BasicInteger
       ^
Main.java:28: error: class Test is public, should be declared in a file named Test.java
public class Test
       ^
Main.java:25: error: value has private access in BasicInteger
      super.setValue (bi.value);
                        ^
Main.java:34: error: cannot find symbol
      a.add (b);
       ^
  symbol:   method add(BasicInteger)
  location: variable a of type EnhancedInteger
5 errors

Standard output is empty