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Jtk, the Java ToolKit 0.04


the Java API for C++, the unification of Gtk and Qt, Gnome and KDE
Last modified : 1999-06-14
Created : 1999-04-30
Author : Guillaume Desnoix ©1999
This document is the translation of this one. Send me email if you find any mistakes.
French

News


14-jun-99: New mailing-list dedicated to Jtk.
11-jun-99: Adding FileInputStream, FlowLayout, Menus.
8-jun-99: Adding support for Gnome, BorderLayout.
1-mai-99: Beginning of the project. Release 0.01.

Presentation

Jtk is a new project whose the objective is to realize a C++ library with the following fuctionalities:

It is destinated to developpers who want to write a new graphical application in C++ or to translate an existing Java one into C++. At the end, Jtk wants to be the equivalent of classes.zip/rt.jar. The translation is obtained by Alma.

A prototype was realized in two days to verify if, at least, it's possible to do such a thing. The first results are encouraging (see the example).

The tools used for this prototype are : GTK 1.2, QT 2.0, GCC 2.7.2.3, Debian GNU/Linux. The memory management is done by the BDW Garbage Collector. The initial Java code was furnished by GNU Classpath or hand-written.

Open positions

To conceive and build Jtk is a long work, that I can't (and don't want) to do it alone. It's why I'm offering you to participate. The more important needs are:

So, don't hesitate to email me, we will organize together this project, which just began yesterday !

Example


Référence (Java)

Version GTK (C++)
Version QT (C++)

Version Gnome (C++)
Version KDE (C++)

The C++ code was obtained by translation, using Alma:

#include "jtk_impl.hpp"
#include "essai.hpp"

static java_lang_Class Essai_class("Essai");

java_lang_Class* Essai::getClass()
{
  return &Essai_class;
}

void Essai::actionPerformed(java_awt_event_ActionEvent* e)
{
  if(e->getSource()==bt1)
    tf1->setText(bt1->getText());

  if(e->getSource()==bt2)
    tf1->setText(bt2->getText());
}

void* Essai::main()
{
  Essai* l=new Essai();
  return l->run();
}

void* Essai::run()
{
  com_sun_java_swing_ImageIcon* ii1=new com_sun_java_swing_ImageIcon("doom.xpm");
  java_awt_Font*  ft1=new java_awt_Font("SansSerif",0,18);

  bt1=new com_sun_java_swing_JButton("Hello",ii1);
  bt2=new com_sun_java_swing_JButton("World");
  lb1=new com_sun_java_swing_JLabel("Guillaume",ii1);
  tf1=new com_sun_java_swing_JTextField(10);

  lb1->setBackground(new java_awt_Color(255l,192l,128l));
  lb1->setForeground(new java_awt_Color(255l,0l,0l));

  bt1->setBackground(new java_awt_Color(255l,255l,128l));
  bt1->setForeground(new java_awt_Color(0l,0l,255l));

  bt2->setBackground(new java_awt_Color(128l,128l,255l));
  bt2->setForeground(new java_awt_Color(255l,255l,0l));
  bt2->setFont(ft1);

  bt1->addActionListener(this);
  bt2->addActionListener(this);

  com_sun_java_swing_JFrame*  f=new com_sun_java_swing_JFrame();
  f->add(bt1);
  f->add(bt2);
  f->add(lb1);
  f->add(tf1);

  f->setSize(400,100);
  f->show();

  return null;
}

License

The distributions 0.01 to 0.04 are available under GPL2 (GNU General Public License release 2). You can read it there.

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