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Java JCheckBox Event Handeling

Ive been looking around for the best solution for this, ive noticed there is loads of different ways to handle what i want to do, but I would like some advise.

You can use ItemListener , ChangeState ActionListener etc.

From what I have seen I think the best practice code would be ActionListener and getState check. Can anyone confirm?

As you can see my current code handling the check box is somewhat shocking (im learning lol ) Im looking to add a few more checkboxes (once I can get one working)so either of combination of each box can be selected. It would then add the relevant string to the searchParam ie "FileType:pdf" , (multiple boxes selected) "FileType:doc,pdf,txt" etc.

I really would be greatful if someone could give me an example with my code. Im not sure if or even how to use any of the ItemListener etc as ive got an extends Actionlistener on the JFrame. Does this effect it at all?

Thanks in advance for any help.

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


class Main extends JFrame implements ActionListener
{
	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;
	
	public String[] FileType ={"Pdf" , "Doc" , "txt" , "xls"};
	
	JPanel pnl ;
	JTextField txt1 ;
	JButton btn1 ;
	JTextArea txtArea ;
	JCheckBox chkpdf = new JCheckBox(FileType[0],true);
	JCheckBox chkdoc = new JCheckBox(FileType[1]);
	JCheckBox chktxt = new JCheckBox(FileType[2]);
	JCheckBox chkxls = new JCheckBox(FileType[3]);
	public Search SearchObject = new Search();
	public String pdf = "FileType:pdf";
	public Main()
		{
		super("Swing Window");
		pnl = new JPanel();
        JPanel pnl1 = new JPanel();
        pnl1.setLayout(new FlowLayout());
        JPanel pnl2 = new JPanel();
        txt1 = new JTextField(20);

        btn1 = new JButton("Search");
        txtArea = new JTextArea(20,30);
        txtArea.setLineWrap(true);

        Container container = this.getContentPane();
        container.setLayout(new BorderLayout());



        pnl.setLayout(new BorderLayout());
        pnl2.add(chkpdf);
		pnl1.add(btn1);
		pnl1.add(txt1);
        pnl.add(pnl1,BorderLayout.NORTH);
		pnl2.add(new JScrollPane(txtArea));
        pnl.add(pnl2, BorderLayout.CENTER);
		btn1.addActionListener(this);
		chkpdf.addActionListener(this);
		
        container.add(pnl);
        setSize(500, 500);
		setDefaultCloseOperation(EXIT_ON_CLOSE);
        setVisible(true);
		}
	
	
	
	public void actionPerformed(ActionEvent event) {
		
		if (event.getSource().equals(btn1)){
			String searchParam = txt1.getText().trim();
		    
		if (searchParam.length() < 1) {
		    String txtCheck = "Enter Query String";
			txtArea.setText(txtCheck);
			return;
		    }
		if (event.getSource().equals(btn1));
				try {
					SearchObject.searchGoog(searchParam);
					txtArea.setText(SearchObject.getLine());
					
					} 
				catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
					}	
		if (event.getSource().equals(btn1) && (chkpdf.isSelected()));{
		 			
		 		try {
		 			SearchObject.searchGoog(searchParam + pdf);
		 			txtArea.setText(SearchObject.getLine());
		 			return;
		 			} 
		    	catch (Exception ex) {
		    			ex.printStackTrace();}}
		    			 
			    }
	}
	

	public static void main (String[] args)
	{
	new Main();
	}
}

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import java.io.*;
import java.net.*;


public class Search {
public String line;
    
    public void searchGoog(String searchString) throws IOException {
        
	URL url = new URL("https://ajax.googleapis.com/ajax/services/search/web?v=1.0&q=" + searchString);
	URLConnection connection = url.openConnection();
        
	StringBuilder builder = new StringBuilder();
	BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
        String buff = null;
	while((buff = reader.readLine()) != null) {
	builder.append(buff);
        
	}
	
System.out.println(builder.toString());
        line = builder.toString();

    }
 public String getLine() {
        return line;
    
    }

    public void setLine(String line) {
        this.line = line; 
    }    
}