Slip No 27 Q B

Q.Write a java program to accept directory name in TextField and display list of files and subdirectories in List Control from that directory by clicking on Button.[25 M]

import java.awt.*;
import java.awt.event.*;
import java.io.*;

public class DirectoryListAWT extends Frame implements ActionListener
{
    TextField tf;
    Button btn;
    List lst;
    Label lbl;

    public DirectoryListAWT()
    {
        setLayout(new FlowLayout());

        lbl = new Label("Enter Directory Name:");
        tf = new TextField(30);
        btn = new Button("Show Files");
        lst = new List(15, true);

        add(lbl);
        add(tf);
        add(btn);
        add(lst);

        btn.addActionListener(this);

        setTitle("Directory File List");
        setSize(400,400);
        setVisible(true);

        addWindowListener(new WindowAdapter(){
            public void windowClosing(WindowEvent e){
                System.exit(0);
            }
        });
    }

    public void actionPerformed(ActionEvent e)
    {
        lst.removeAll();

        String dirname = tf.getText();
        File f = new File(dirname);

        if(f.exists() && f.isDirectory())
        {
            String files[] = f.list();

            for(int i=0;i<files.length;i++)
            {
                File temp = new File(dirname + File.separator + files[i]);

                if(temp.isDirectory())
                    lst.add(files[i] + "  <DIR>");
                else
                    lst.add(files[i] + "  <FILE>");
            }
        }
        else
        {
            lst.add("Invalid Directory");
        }
    }

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