Counter in GUI

[danbnl]

I'm making an airline program that keeps track of passengers, and I was wanting to keep a counter on the GUI so is there a way I do this?
Maybe with a JTextArea?
I'm very new to java BTW

thanks.

[Khalid Ali]

I think there is a JLabel as well use that..and repaint it every time counter changes.

[danbnl]

Can I do something like this? I just want to counter to add one when clicked.

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class lab extends JApplet implements ActionListener
{
private static int count=0;


public void init()
{

Container container=getContentPane();
container.setLayout(new FlowLayout());
JButton button=new JButton("Add");
JLabel label=new JLabel("Passenger count");
//has to have the "" to work
JTextField field=new JTextField(count+"",4);


container.add(new JScrollPane(button));
container.add(new JScrollPane(label));
container.add(new JScrollPane(field));

setSize(350,100);
setVisible(true);

button.addActionListener(this);

}//end main


public void actionPerformed(ActionEvent event)
{
count++;
Container.getContentPane().repaint();
}
}

[Khalid Ali]

don't have to repaint the whole of the container(too much work?)
I think just repainting the label or textfield or text area will do.

[danbnl]

Ok, so I just make field static and then do I use field.repaint() like this?


public void actionPerformed(ActionEvent event)
{
count++;
field.repaint();
}

[Khalid Ali]

instead of making counter static,
get the existing value from the field,
convert it to an integer
and add one to it
and then set the new value and finally repaint

[danbnl]

Ok I did what you said and now I have this

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class lab extends JApplet implements ActionListener
{
private static int count=0;
private static int number=0;
private static JTextField field;

public void init()
{

Container container=getContentPane();
container.setLayout(new FlowLayout());
JButton button=new JButton("Add");
JLabel label=new JLabel("Passenger count");
field=new JTextField("0",4);
String num=field.getText();
number=Integer.parseInt(num);

//has to have the "" to work


container.add(new JScrollPane(button));
container.add(new JScrollPane(label));
container.add(new JScrollPane(field));

setSize(350,100);
setVisible(true);
button.addActionListener(this);

}//end init


public void actionPerformed(ActionEvent event)
{
number++;
field.repaint();
}


}//end class

but something isn't right, what am I doing wrong?

[Khalid Ali]

There is still allot thats missing...anyways..here is the working solution

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class lab extends JApplet implements ActionListener
{
private JTextField field;

public void init()
{

Container container=getContentPane();
container.setLayout(new FlowLayout());
JButton button=new JButton("Add");
button.setName("Add");
JLabel label=new JLabel("Passenger count");
field=new JTextField("0",4);

container.add(new JScrollPane(button));
container.add(new JScrollPane(label));
container.add(new JScrollPane(field));

setSize(350,100);
setVisible(true);
button.addActionListener(this);

}//end init


public void actionPerformed(ActionEvent event){
if(event.getSource() instanceof JButton){
  JButton button = (JButton)event.getSource();
  if(button!=null && button.getName().equals("Add")){
    String num=field.getText();
    int number=Integer.parseInt(num);
    number = number + 1;
    field.setText(String.valueOf(number));
    field.repaint();
  }
}

}

public static void main(String[] args){
  lab applet = new lab();
  Frame frame;
      frame = new Frame();
      frame.setTitle("Applet Frame");
      frame.add(applet, BorderLayout.CENTER);
      applet.init();
      applet.start();
      frame.setSize(400,320);
      Dimension d = Toolkit.getDefaultToolkit().getScreenSize();
      frame.setLocation((d.width - frame.getSize().width) / 2, (d.height - frame.getSize().height) / 2);
      frame.setVisible(true);

}
}//end class 

This will do....

[danbnl]

Thanks a lot!