import java.awt.FlowLayout;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;

import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JTextField;

public class Gui extends JFrame
{
    private JCheckBox desktopbutton;
    private JCheckBox documentsbutton;
    private JCheckBox downloadsbutton;
    private JTextField button;
    private String filepath = "C:\\Users\\" + System.getProperty("user.name");

    public Gui()
    {
        super("File opener");
        setLayout(new FlowLayout());

        String buttontext = "Please select where your file is located.";

        button = new JTextField(buttontext, buttontext.length());
        button.setEditable(false);

        desktopbutton = new JCheckBox("Desktop");
        documentsbutton = new JCheckBox("Documents");
        downloadsbutton = new JCheckBox("Downloads");
        add(desktopbutton);
        add(documentsbutton);
        add(downloadsbutton);

        Handler handler = new Handler();

        desktopbutton.addItemListener(handler);
        documentsbutton.addItemListener(handler);
        downloadsbutton.addItemListener(handler);

        System.out.println(filepath);
    }
    private class Handler implements ItemListener
    {
        public void itemStateChanged(ItemEvent e)
        {
if(desktopbutton.isSelected())
    if(!filepath.contains("\\Desktop")&&!filepath.contains("\\Documents")&&!filepath.contains("\\Downloads"))
        filepath += "\\Desktop";

else if(documentsbutton.isSelected())
    if(!filepath.contains("\\Desktop")&&!filepath.contains("\\Documents")&&!filepath.contains("\\Downloads"))
        filepath += "\\Documents";

else if(downloadsbutton.isSelected())
    if(!filepath.contains("\\Desktop")&&!filepath.contains("\\Documents")&&!filepath.contains("\\Downloads"))
            filepath += "\\Downloads";
*** IGNORETHIS! *** System.out.println(filepath);
        }
    }
}