Applet calculatrice (premiere applet)

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Description

ceci est ma première applet (comme quand j'ai commencé delphi, je me suis décidé pour une calculatrice, lol), alors soyez indulgents et ne me lapidez pas trop ;-)
je pense que le code est assez clair malgré l'absence de commentaires, toutefois j'aimerais savoir si je n'ai pas fait trop d'erreurs et aussi comment assigner un raccourci aux boutons (par exemple, si j'appuie sur la touche "1" du pavé numérique, que l'applet considère que j'ai cliqué sur son bouton "1", etc...)
en fonction des remarques/critiques et aides, je reposterais cette applet (avec moults commentaires), car vu que c'est avec elle (enfin, j'ai beaucoup lu quelques sites et mis en application dans ce projet) que j'ai appris ce que je sais en java, en particulier sur le placement des composants, je pense que ça pourra resservir à d'autres ;-)
merci d'avance de votre aide !!

Source / Exemple : 


import java.awt.*;
import java.awt.event.*;
public final class Calc extends java.applet.Applet implements ActionListener
{ public final Color clBackGround = new Color(213, 204, 187);
  public final Color clForeGround = new Color(0, 0, 0);
  public final Color clOperations = new Color(128, 255, 0);
  public final Color clCancel = new Color(255, 128, 0);
  public final Color clDone = new Color(255, 200, 0);
  public final Color clNbs = new Color(213, 204, 187);
  public static void main(String[] args)
  { System.out.println("Ceci est une applet Java, et non une application Java.");
    System.out.println("Elle doit donc être exécutée par l'intermédiaire de votre navigateur internet.");
  }
  private int Op = -1;
  private String Nb1 = "0";
  private String Nb2 = "0";
  private Label CalcResult = new Label("0", Label.RIGHT);
  private Button ButtonDivide = new Button("/");
  private Button ButtonMultiply = new Button("*");
  private Button ButtonAdd = new Button("+");
  private Button ButtonMinus = new Button("-");
  private Button Button7 = new Button("7");
  private Button Button8 = new Button("8");
  private Button Button9 = new Button("9");
  private Button ButtonCancel = new Button("C");
  private Button Button4 = new Button("4");
  private Button Button5 = new Button("5");
  private Button Button6 = new Button("6");
  private Button Button1 = new Button("1");
  private Button Button2 = new Button("2");
  private Button Button3 = new Button("3");
  private Button ButtonEquals = new Button("=");
  private Button Button0 = new Button("0");
  private Button ButtonPoint = new Button(".");
  public void init()
  { setBackground(clForeGround);
    setForeground(clForeGround);
    setLayout(new GridBagLayout());
    CalcResult.setBackground(clBackGround);
    CalcResult.setForeground(clForeGround);
    setFont(new Font("Courier", Font.PLAIN, 17));
    GridBagConstraints calcConstraints = new GridBagConstraints();
    Insets calcInsets = new Insets(4, 4, 4, 4);
    calcConstraints.gridx = 0;
    calcConstraints.gridy = 0;
    calcConstraints.gridwidth = 4;
    calcConstraints.gridheight = 1;
    calcConstraints.weightx = 100;
    calcConstraints.weighty = 100;
    calcConstraints.fill = GridBagConstraints.HORIZONTAL;
    calcConstraints.anchor = GridBagConstraints.CENTER;
    calcConstraints.insets = calcInsets;
    calcConstraints.ipadx = 0;
    calcConstraints.ipady = 0;
    add(CalcResult, calcConstraints);
    calcConstraints.gridx = 0;
    calcConstraints.gridy = 1;
    calcConstraints.gridwidth = 1;
    calcConstraints.gridheight = 1;
    calcConstraints.weightx = 100;
    calcConstraints.weighty = 100;
    calcConstraints.fill = GridBagConstraints.BOTH;
    calcConstraints.anchor = GridBagConstraints.CENTER;
    calcConstraints.insets = calcInsets;
    calcConstraints.ipadx = 0;
    calcConstraints.ipady = 0;
    ButtonDivide.setBackground(clOperations);
    ButtonDivide.setForeground(clForeGround);
    ButtonDivide.setActionCommand("DIV");
    ButtonDivide.addActionListener(this);
    add(ButtonDivide, calcConstraints);
    calcConstraints.gridx = 1;
    calcConstraints.gridy = 1;
    calcConstraints.gridwidth = 1;
    calcConstraints.gridheight = 1;
    calcConstraints.weightx = 100;
    calcConstraints.weighty = 100;
    calcConstraints.fill = GridBagConstraints.BOTH;
    calcConstraints.anchor = GridBagConstraints.CENTER;
    calcConstraints.insets = calcInsets;
    calcConstraints.ipadx = 0;
    calcConstraints.ipady = 0;
    ButtonMultiply.setBackground(clOperations);
    ButtonMultiply.setForeground(clForeGround);
    ButtonMultiply.setActionCommand("MUL");
    ButtonMultiply.addActionListener(this);
    add(ButtonMultiply, calcConstraints);
    calcConstraints.gridx = 2;
    calcConstraints.gridy = 1;
    calcConstraints.gridwidth = 1;
    calcConstraints.gridheight = 1;
    calcConstraints.weightx = 100;
    calcConstraints.weighty = 100;
    calcConstraints.fill = GridBagConstraints.BOTH;
    calcConstraints.anchor = GridBagConstraints.CENTER;
    calcConstraints.insets = calcInsets;
    calcConstraints.ipadx = 0;
    calcConstraints.ipady = 0;
    ButtonAdd.setBackground(clOperations);
    ButtonAdd.setForeground(clForeGround);
    ButtonAdd.setActionCommand("ADD");
    ButtonAdd.addActionListener(this);
    add(ButtonAdd, calcConstraints);
    calcConstraints.gridx = 3;
    calcConstraints.gridy = 1;
    calcConstraints.gridwidth = 1;
    calcConstraints.gridheight = 1;
    calcConstraints.weightx = 100;
    calcConstraints.weighty = 100;
    calcConstraints.fill = GridBagConstraints.BOTH;
    calcConstraints.anchor = GridBagConstraints.CENTER;
    calcConstraints.insets = calcInsets;
    calcConstraints.ipadx = 0;
    calcConstraints.ipady = 0;
    ButtonMinus.setBackground(clOperations);
    ButtonMinus.setForeground(clForeGround);
    ButtonMinus.setActionCommand("SUB");
    ButtonMinus.addActionListener(this);
    add(ButtonMinus, calcConstraints);
    calcConstraints.gridx = 0;
    calcConstraints.gridy = 2;
    calcConstraints.gridwidth = 1;
    calcConstraints.gridheight = 1;
    calcConstraints.weightx = 100;
    calcConstraints.weighty = 100;
    calcConstraints.fill = GridBagConstraints.BOTH;
    calcConstraints.anchor = GridBagConstraints.CENTER;
    calcConstraints.insets = calcInsets;
    calcConstraints.ipadx = 0;
    calcConstraints.ipady = 0;
    Button7.setBackground(clNbs);
    Button7.setForeground(clForeGround);
    Button7.setActionCommand("7");
    Button7.addActionListener(this);
    add(Button7, calcConstraints);
    calcConstraints.gridx = 1;
    calcConstraints.gridy = 2;
    calcConstraints.gridwidth = 1;
    calcConstraints.gridheight = 1;
    calcConstraints.weightx = 100;
    calcConstraints.weighty = 100;
    calcConstraints.fill = GridBagConstraints.BOTH;
    calcConstraints.anchor = GridBagConstraints.CENTER;
    calcConstraints.insets = calcInsets;
    calcConstraints.ipadx = 0;
    calcConstraints.ipady = 0;
    Button8.setBackground(clNbs);
    Button8.setForeground(clForeGround);
    Button8.setActionCommand("8");
    Button8.addActionListener(this);
    add(Button8, calcConstraints);
    calcConstraints.gridx = 2;
    calcConstraints.gridy = 2;
    calcConstraints.gridwidth = 1;
    calcConstraints.gridheight = 1;
    calcConstraints.weightx = 100;
    calcConstraints.weighty = 100;
    calcConstraints.fill = GridBagConstraints.BOTH;
    calcConstraints.anchor = GridBagConstraints.CENTER;
    calcConstraints.insets = calcInsets;
    calcConstraints.ipadx = 0;
    calcConstraints.ipady = 0;
    Button9.setBackground(clNbs);
    Button9.setForeground(clForeGround);
    Button9.setActionCommand("9");
    Button9.addActionListener(this);
    add(Button9, calcConstraints);
    calcConstraints.gridx = 3;
    calcConstraints.gridy = 2;
    calcConstraints.gridwidth = 1;
    calcConstraints.gridheight = 2;
    calcConstraints.weightx = 100;
    calcConstraints.weighty = 100;
    calcConstraints.fill = GridBagConstraints.BOTH;
    calcConstraints.anchor = GridBagConstraints.CENTER;
    calcConstraints.insets = calcInsets;
    calcConstraints.ipadx = 0;
    calcConstraints.ipady = 0;
    ButtonCancel.setBackground(clCancel);
    ButtonCancel.setForeground(clForeGround);
    ButtonCancel.setActionCommand("RAZ");
    ButtonCancel.addActionListener(this);
    add(ButtonCancel, calcConstraints);
    calcConstraints.gridx = 0;
    calcConstraints.gridy = 3;
    calcConstraints.gridwidth = 1;
    calcConstraints.gridheight = 1;
    calcConstraints.weightx = 100;
    calcConstraints.weighty = 100;
    calcConstraints.fill = GridBagConstraints.BOTH;
    calcConstraints.anchor = GridBagConstraints.CENTER;
    calcConstraints.insets = calcInsets;
    calcConstraints.ipadx = 0;
    calcConstraints.ipady = 0;
    Button4.setBackground(clNbs);
    Button4.setForeground(clForeGround);
    Button4.setActionCommand("4");
    Button4.addActionListener(this);
    add(Button4, calcConstraints);
    calcConstraints.gridx = 1;
    calcConstraints.gridy = 3;
    calcConstraints.gridwidth = 1;
    calcConstraints.gridheight = 1;
    calcConstraints.weightx = 100;
    calcConstraints.weighty = 100;
    calcConstraints.fill = GridBagConstraints.BOTH;
    calcConstraints.anchor = GridBagConstraints.CENTER;
    calcConstraints.insets = calcInsets;
    calcConstraints.ipadx = 0;
    calcConstraints.ipady = 0;
    Button5.setBackground(clNbs);
    Button5.setForeground(clForeGround);
    Button5.setActionCommand("5");
    Button5.addActionListener(this);
    add(Button5, calcConstraints);
    calcConstraints.gridx = 2;
    calcConstraints.gridy = 3;
    calcConstraints.gridwidth = 1;
    calcConstraints.gridheight = 1;
    calcConstraints.weightx = 100;
    calcConstraints.weighty = 100;
    calcConstraints.fill = GridBagConstraints.BOTH;
    calcConstraints.anchor = GridBagConstraints.CENTER;
    calcConstraints.insets = calcInsets;
    calcConstraints.ipadx = 0;
    calcConstraints.ipady = 0;
    Button6.setBackground(clNbs);
    Button6.setForeground(clForeGround);
    Button6.setActionCommand("6");
    Button6.addActionListener(this);
    add(Button6, calcConstraints);
    calcConstraints.gridx = 0;
    calcConstraints.gridy = 4;
    calcConstraints.gridwidth = 1;
    calcConstraints.gridheight = 1;
    calcConstraints.weightx = 100;
    calcConstraints.weighty = 100;
    calcConstraints.fill = GridBagConstraints.BOTH;
    calcConstraints.anchor = GridBagConstraints.CENTER;
    calcConstraints.insets = calcInsets;
    calcConstraints.ipadx = 0;
    calcConstraints.ipady = 0;
    Button1.setBackground(clNbs);
    Button1.setForeground(clForeGround);
    Button1.setActionCommand("1");
    Button1.addActionListener(this);
    add(Button1, calcConstraints);
    calcConstraints.gridx = 1;
    calcConstraints.gridy = 4;
    calcConstraints.gridwidth = 1;
    calcConstraints.gridheight = 1;
    calcConstraints.weightx = 100;
    calcConstraints.weighty = 100;
    calcConstraints.fill = GridBagConstraints.BOTH;
    calcConstraints.anchor = GridBagConstraints.CENTER;
    calcConstraints.insets = calcInsets;
    calcConstraints.ipadx = 0;
    calcConstraints.ipady = 0;
    Button2.setBackground(clNbs);
    Button2.setForeground(clForeGround);
    Button2.setActionCommand("2");
    Button2.addActionListener(this);
    add(Button2, calcConstraints);
    calcConstraints.gridx = 2;
    calcConstraints.gridy = 4;
    calcConstraints.gridwidth = 1;
    calcConstraints.gridheight = 1;
    calcConstraints.weightx = 100;
    calcConstraints.weighty = 100;
    calcConstraints.fill = GridBagConstraints.BOTH;
    calcConstraints.anchor = GridBagConstraints.CENTER;
    calcConstraints.insets = calcInsets;
    calcConstraints.ipadx = 0;
    calcConstraints.ipady = 0;
    Button3.setBackground(clNbs);
    Button3.setForeground(clForeGround);
    Button3.setActionCommand("3");
    Button3.addActionListener(this);
    add(Button3, calcConstraints);
    calcConstraints.gridx = 3;
    calcConstraints.gridy = 4;
    calcConstraints.gridwidth = 1;
    calcConstraints.gridheight = 2;
    calcConstraints.weightx = 100;
    calcConstraints.weighty = 100;
    calcConstraints.fill = GridBagConstraints.BOTH;
    calcConstraints.anchor = GridBagConstraints.CENTER;
    calcConstraints.insets = calcInsets;
    calcConstraints.ipadx = 0;
    calcConstraints.ipady = 0;
    ButtonEquals.setBackground(clDone);
    ButtonEquals.setForeground(clForeGround);
    ButtonEquals.setActionCommand("DONE");
    ButtonEquals.addActionListener(this);
    add(ButtonEquals, calcConstraints);
    calcConstraints.gridx = 0;
    calcConstraints.gridy = 5;
    calcConstraints.gridwidth = 2;
    calcConstraints.gridheight = 1;
    calcConstraints.weightx = 100;
    calcConstraints.weighty = 100;
    calcConstraints.fill = GridBagConstraints.BOTH;
    calcConstraints.anchor = GridBagConstraints.CENTER;
    calcConstraints.insets = calcInsets;
    calcConstraints.ipadx = 0;
    calcConstraints.ipady = 0;
    Button0.setBackground(clNbs);
    Button0.setForeground(clForeGround);
    Button0.setActionCommand("0");
    Button0.addActionListener(this);
    add(Button0, calcConstraints);
    calcConstraints.gridx = 2;
    calcConstraints.gridy = 5;
    calcConstraints.gridwidth = 1;
    calcConstraints.gridheight = 1;
    calcConstraints.weightx = 100;
    calcConstraints.weighty = 100;
    calcConstraints.fill = GridBagConstraints.BOTH;
    calcConstraints.anchor = GridBagConstraints.CENTER;
    calcConstraints.insets = calcInsets;
    calcConstraints.ipadx = 0;
    calcConstraints.ipady = 0;
    ButtonPoint.setBackground(clNbs);
    ButtonPoint.setForeground(clForeGround);
    ButtonPoint.setActionCommand("POINT");
    ButtonPoint.addActionListener(this);
    add(ButtonPoint, calcConstraints);
  }
  public void start()
  { requestFocus();
  }
  private void dispResult(String s)
  { if (s.charAt(0) == '0') s = s.substring(1, s.length());
    if (s.charAt(0) == '.') s = "0" + s;
    CalcResult.setText(s);
  }
  private void doRAZ()
  { CalcResult.setText("0");
    Nb1 = "0";
    Nb2 = "0";
    Op = -1;
  }
  private void addChar(char digit)
  { if (Op > 0)
    { if (Nb2.charAt(0) == '0') Nb2 = "" + digit; else Nb2 = Nb2 + digit;
      dispResult(Nb2);
    }
    else
    { if (Op == 0) doRAZ();
      if (Nb1.charAt(0) == '0') Nb1 = "" + digit; else Nb1 = Nb1 + digit;
      dispResult(Nb1);
    }
  }
  private float getNb(String s)
  { return (new Float(s)).floatValue();
  }
  private void doOperation()
  { float Nb = 0;
    switch (Op)
    { case  1 : Nb = (getNb(Nb1) / getNb(Nb2)); break;
      case  2 : Nb = (getNb(Nb1) * getNb(Nb2)); break;
      case  3 : Nb = (getNb(Nb1) + getNb(Nb2)); break;
      case  4 : Nb = (getNb(Nb1) - getNb(Nb2)); break;
      default : return;
    }
    Op = 0;
    Nb2 = "0";
    Nb1 = Float.toString(Nb);
    dispResult(Nb1);
  }
  public void actionPerformed(ActionEvent e)
  { String theAction = e.getActionCommand();
    if (theAction.equals("POINT"))
    { if ((CalcResult.getText()).indexOf('.') < 0) addChar('.');
    }
    if (theAction.equals("0"))
    { addChar('0');
    }
    if (theAction.equals("1"))
    { addChar('1');
    }
    if (theAction.equals("2"))
    { addChar('2');
    }
    if (theAction.equals("3"))
    { addChar('3');
    }
    if (theAction.equals("4"))
    { addChar('4');
    }
    if (theAction.equals("5"))
    { addChar('5');
    }
    if (theAction.equals("6"))
    { addChar('6');
    }
    if (theAction.equals("7"))
    { addChar('7');
    }
    if (theAction.equals("8"))
    { addChar('8');
    }
    if (theAction.equals("9"))
    { addChar('9');
    }
    if (theAction.equals("DIV"))
    { if (Op > 0) doOperation();
      CalcResult.setText("0");
      Nb2 = "0";
      Op = 1;
    }
    if (theAction.equals("MUL"))
    { if (Op > 0) doOperation();
      CalcResult.setText("0");
      Nb2 = "0";
      Op = 2;
    }
    if (theAction.equals("ADD"))
    { if (Op > 0) doOperation();
      CalcResult.setText("0");
      Nb2 = "0";
      Op = 3;
    }
    if (theAction.equals("SUB"))
    { if (Op > 0) doOperation();
      CalcResult.setText("0");
      Nb2 = "0";
      Op = 4;
    }
    if (theAction.equals("RAZ"))
    { doRAZ();
    }
    if (theAction.equals("DONE"))
    { if (Op > 0) doOperation();
    }
  }
}

Conclusion :


pas de bugs connus, hormis des erreurs de précisions dues aux float...
j'attend vos remarques ;-)
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