Ascii Converter mit Swing

[katchy]

Hallöchen
ich soll mit Java Swing einen Ascii Converter bauen.
Von char in Ascii kann ich konvertieren, aber es funktioniert nicht andersherum.
Vielleicht kann mir jemand einen Tipp geben:/

public class Ex1_2 {

   
    public static void main(String[] args)
    {
    SwingApp app = new SwingApp(350, 250);      // set app window size
    app.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
}

class SwingApp extends JFrame implements ActionListener
{
    private JButton characterButton, asciiButton;
    private JLabel c, a, yellow1, orange2, yellow2, orange1;
    private JTextField character, ascii;
    private final DrawPanel panel;          // class variable
   
    public SwingApp(int width, int height)      // class constructor
    {
        super();                    // call to super class constructor
        Container pane = super.getContentPane();    // create layout, set colors
        panel = new DrawPanel();            // add GUI components
        panel.setBackground(Color.green);
            // add other GUI components to the panel
       
        orange1 = new JLabel("Char<-> ASCII converter", JLabel.CENTER);
        orange1.setForeground(Color.blue);
        orange1.setBackground(Color.orange);
        orange1.setOpaque(true);
      
        c = new JLabel(" ");
        c.setForeground(Color.black);
        c.setBackground(Color.green);
        c.setOpaque(true);
       
        a = new JLabel(" ");
        a.setForeground(Color.black);
        a.setBackground(Color.green);
        a.setOpaque(true);
       
        yellow1 = new JLabel();
        yellow1.setBackground(Color.yellow);
        yellow1.setOpaque(true);
       
        yellow2 = new JLabel();
        yellow2.setBackground(Color.yellow);
        yellow2.setOpaque(true);
       
        character = new JTextField(" ");
       
        ascii = new JTextField(" ");
       
        orange2 = new JLabel();
        orange2.setBackground(Color.orange);
        orange2.setOpaque(true);
       
        characterButton = new JButton("Character");
        characterButton.setForeground(Color.black);
        characterButton.setBackground(Color.green);
        characterButton.setOpaque(true);
       
        asciiButton = new JButton("Ascii");
        asciiButton.setForeground(Color.black);
        asciiButton.setBackground(Color.green);
        asciiButton.setOpaque(true);
       
        pane.setLayout(null);
       
        orange1.setBounds(0, 0, 350,20);
        c.setBounds(0,20,175,250);
        a.setBounds(175,20,175,250);
        yellow1.setBounds(0,100,170,80);
        yellow2.setBounds(185,100,170,80);
        character.setBounds(70,105,20,25);
        ascii.setBounds(240,105,45,25);
        orange2.setBounds(0,182,350,20);
        characterButton.setBounds(0,20,175,75);
        asciiButton.setBounds(175,20,175,75);
       
        pane.add(orange1);
        pane.add(character);
        pane.add(ascii);
        pane.add(yellow1);
        pane.add(yellow2); 
        pane.add(orange2);
        pane.add(c);
        pane.add(a);
        pane.add(characterButton);
        pane.add(asciiButton);
        pane.add(panel);
       
        characterButton.addActionListener(this);
        asciiButton.addActionListener(this);
       

        pane.add(panel);                            // add panel to the main app container
        Toolkit toolkit = Toolkit.getDefaultToolkit();  // optionally position JFrame
        Dimension screenSize = toolkit.getScreenSize(); // in the middle of the screen
        super.setLocation((screenSize.width - width)/2, (screenSize.height - height)/2);   
        super.setTitle("charakter <-> ASCII converter");            // set desired window title
        super.setSize(width, height);           // set desired window size
        super.setVisible(true);                     // make the app window visible
        }

    private void jButton2ActionPerformed(java.awt.event.ActionEvent evt){
        String char1;
        int ascii1 = 0;
        boolean isAChar = true;
       
        try{
            char1 = character.getText();
           
            for (int j=0; j<=1; j++)
            {
            char c2 = char1.charAt(j);
            ascii1 = (int) c2;
            }
            ascii.setText(String.valueOf(ascii1));
            orange2.setText("conversion completed");
            orange2.setForeground(Color.WHITE);
            isAChar=true;
        }catch (IndexOutOfBoundsException e){
            orange2.setText("Not a Character");
            isAChar=false;
        }
       
    }
   
    private void jButton2ActionPerformedAscii(java.awt.event.ActionEvent evt){
       String newAscii;
       char aChar = 0;
      
      try{
         
          newAscii = ascii.getText();
     
          for(int i = 0; i<=1; i++){
              int ascii2= Integer.parseInt(newAscii);
              char c2 = (char) ascii2;
              aChar = c2;
          }
           character.setText(String.valueOf(aChar));
           orange2.setText("conversion completed");
           orange2.setForeground(Color.WHITE);
      }catch(NumberFormatException e){
          orange2.setText("Not a Number");
          orange2.setForeground(Color.WHITE);
      }
     }

    @Override
    public void actionPerformed(ActionEvent e) {
       if(e.getSource() == characterButton){
           jButton2ActionPerformed(e);
          
       }
       if(e.getSource() == asciiButton){
           jButton2ActionPerformedAscii(e);
       }
      
    }

    class DrawPanel extends JPanel              // main window panel
    {
        @Override
        public void paintComponent(Graphics g)
        {
        super.paintComponent(g);            // must be the 1st line
        // add here other code for drawing on panel

   }
}
}

Die Methide jButton2ActionPerformedAscii soll eig von Ascii in char zurückgeben

Liebe Grüße
Katharina

 

[krgewb]

Das liegt an dem Leerzeichen in folgender Zeile:

ascii = new JTextField(" ");

 

[katchy]

ooooh danke den Fehler hätte ich alleine wohl nie entdeckt^^

 

[katchy]

Wie kann ich am besten überprüfen ob nur ein char eingegeben wurde?

 

[krgewb]

character = new JTextField(" ");

Du solltest dort auch erst das Leerzeichen entfernen. Alternativ kann auch trim() angewandt werden.

Mit

character.getText().length;

kannst du die Länge abfragen.