[Uml-devel] [Bug 53374] Java interface inheritance, abstract classes and generics in code generation

[Harald Wallus]

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http://bugs.kde.org/show_bug.cgi?id=53374     




------- Additional Comments From wallus at results-hannover.de  2003-11-26 13:29 -------
To 1) 
Yes. Java do not need the keyword abstract:

interface Material
{
  int HART      = 0,
      WEICH     = HART + 1,
      FLAUSCHIG = WEICH + 1;
  int berechneGewicht();
}
class Wolle implements Material
{
  public int berechneGewicht() { return 234; }
}
class Synthetik implements Material
{
  public int berechneGewicht() { return 452; }
}
abstract class Stahl implements Material
{
  boolean glänzend;
}
 

Some more special in java:

If java have an abstract class, it can be extends

abstract class Tier
{
  int alter = -1;
  void alterSetzen( int a ) { alter = a; }
  abstract boolean istSäuger();
  abstract void ausgabe();
}
abstract class Säugetier extends Tier
{
  boolean istSäuger() { return true; }
}
class Mensch extends Säugetier
{
  void ausgabe() {
    System.out.println( "Ich bin ein Mensch" );
  }
}
class Delfin extends Säugetier
{
  void ausgabe() {
    System.out.println( "Ich bin ein Delfin" );
  }
}


And Java can be implements and extends:
Which means, you can implement an Interface and extend a abstract class.
This is used e.g. in ejb or ozone (for serializing objects)

package srv;
import ozoneDB.OzoneRemote;
abstract public interface Car implements OzoneRemote {
  public String getCarBez ( );
  public boolean setCarBez ( String CarBez);
  public boolean setCarColor ( String CarColor);
  public String getCarColor ( );
  public boolean setMonthKm ( int Month, int Km);
  public int getMonthKm ( int Month);
}

and (I cut the methodscoding off):

package srv;
import ozoneDB.OzoneObject;
public class CarImpl implements Car extends OzoneObject {
  static public long serialVersionUID = 1L;
  private String m_CarBez;
  private String m_CarColor;
  private int m_MonthKm[];
  public String getCarBez ( ) {
  }
  public boolean setCarBez ( String CarBez) {
  }
  public String getCarColor ( ) {
  }
  public boolean setCarColor ( String CarColor) {
  }
  public boolean setMonthKm ( int Month, int Km) {
  }
  public int getMonthKm ( int Month) {
  }  

May this helps.
Oh, one think:
at the moment (tarball vom 11/23/03) the package and import 
statements are written at the bottom of the source code!