listeners

[Victoria Preston]

I am having trouble attaching listeners to my gui. Here is my my code for the gui

public class ParserGUI extends JFrame
{
public ParserGUI()
{
super("Lisp Function");
setBounds(XOFFSET,YOFFSET,XWIDTH,YHEIGHT);
setDefaultCloseOperation(EXIT_ON_CLOSE);

input = new JTextField(20);
in = new JLabel("input");
output = new JTextField(10);
out = new JLabel("output");

text = new JPanel();
text.add(in);
text.add(input);
text2 = new JPanel();
text2.add(out);
text2.add(output);

calc = new JButton("Calculate");
button = new JPanel();
button.add(calc);

Container content = getContentPane();
content.add(text, BorderLayout.NORTH);
content.add(button, BorderLayout.CENTER);
content.add(text2, BorderLayout.SOUTH);
}
private class ButtonListener implements ActionListener
{
 
public void actionPerformed(ActionEvent arg0)
{
Scanner sc = new Scanner(System.in).useDelimiter("\\.*");
Parser p = new Parser();

        try {
p.parseExpr(sc);
} catch (Throwable e) {
e.printStackTrace();
}
// TODO Auto-generated method stub

}


}

private JTextField input;
private JTextField output;
private JLabel in;
private JLabel out;
private JPanel text;
private JPanel text2;
private JButton calc;
private JPanel button;
private static final int XOFFSET = 100;
private static final int YOFFSET = 100;
private static final int XWIDTH = 350;
private static final int YHEIGHT = 150;
 
}
    

If you run the program you see I have two text field. one for input and one for the output. I am suppose to take the text in the input field and calc using my calculation class.

Can anyone help. I know I did not explain it well. Just tell me what you need to know

[Michael Dunn]

calc.addActionListener(new ButtonListener());

but this part doesn't look right
Scanner sc = new Scanner(System.in).useDelimiter("\\.*");
...
p.parseExpr(sc);

as you are reading from and outputting to the textfields, perhaps it should be
output.setText(p.parseExpr(input.getText());

assuming p.parseExpr(..) returns a String,and you would need suitable error
handling for an empty input

[Victoria Preston]

thanks I have it working now... you were right.