Question

I have developed a program that is counting the number of lines in a file that is shown below

Scanner in=new Scanner(System.in);
    System.out.println("Enter the Drive name like C,D,E etc");
    String drive=in.next();
    System.out.println("Enter the main folder name");
    String main_folder=in.next();
    File directory=new File(drive+":"+"//"+main_folder+"//");

Map<String, Integer> result = new HashMap<String, Integer>();
    //File directory = new File("C:/Test/");
    File[] files = directory.listFiles();
    for (File file : files) {
        if (file.isFile()) {
            Scanner scanner = new Scanner(new FileReader(file));
            int lineCount = 0;
            try {
                for (lineCount = 0; scanner.nextLine() != null; lineCount++);
            } catch (NoSuchElementException e) {
                result.put(file.getName(), lineCount);
            } }}        

    for( Map.Entry<String, Integer> entry:result.entrySet()){
          System.out.println(entry.getKey()+" ==> "+entry.getValue());
        }

but I was trying to add a swing interface JFilechooser , I want that user should select the particular folder and all the files inside that folder to be get selected and rest above as my code works as it is , Please advise

Please advise for desiging the jfile chooser so that I can integrate my above code.

I have design one more solution that is

package aa;

import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.FileDialog;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStreamReader;

import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JTextField;

public class FileBrowse extends JFrame {

private JButton browseSwing = new JButton("Choose File");
private JTextField textField = new JTextField(30);
private JButton approve = new JButton("Ok");


public FileBrowse() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setSize(600,80);
setResizable(false);

browseSwing.addActionListener(new ActionListener() {
    public void actionPerformed(ActionEvent arg0) {
        if (arg0.getSource()==browseSwing)
        onBrowseSwing();
        }});


Container container = getContentPane();
container.setLayout(new FlowLayout());
container.add(browseSwing);
container.add(textField);
container.add(approve);

//pack();
}

protected void onBrowseSwing() {
JFileChooser fileChooser = new JFileChooser();
int result = fileChooser.showDialog(this, "Open/Save");
if (result == JFileChooser.APPROVE_OPTION) {
File file = fileChooser.getSelectedFile();
textField.setText(file.toString());
String x = file.toString();
fileRead(x);
}
}

public void fileRead(String input){
    try{
        // Open the file that is the first
        // command line parameter
        FileInputStream fstream = new FileInputStream(input);
        // Get the object of DataInputStream
        DataInputStream in = new DataInputStream(fstream);
            BufferedReader br = new BufferedReader(new InputStreamReader(in));
        String strLine;
        int count = 0;
        int count2 = 0;
        //Read File Line By Line
        while((strLine = br.readLine())!= null ){
            if (strLine.trim().length() != 0){
                count++;
            }else{
                count2++;
            }
        }
        System.out.println("-------Lines Of COdes-------");
        System.out.println("number of lines:" + count);
        System.out.println("number of blank lines:" + count2);
        //Close the input stream
        in.close();
        }catch (Exception e){//Catch exception if any
          System.err.println("Error: " + e.getMessage());
        }


}


public static void main(String[] args) {
new FileBrowse().setVisible(true);

}
}

but it chooses the individual files I want that all the files to be get selected inside that folder Test

Answer 1

You could use this code (adapted from here):

    JFileChooser chooser = new JFileChooser();
    chooser.setCurrentDirectory(new java.io.File("."));
    chooser.setDialogTitle("choosertitle");
    chooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
    chooser.setAcceptAllFileFilterUsed(false);

    if (chooser.showOpenDialog(null) == JFileChooser.APPROVE_OPTION)
    {

        Map<String, Integer> result = new HashMap<String, Integer>();
        File directory = new File(choosers.getSelectedFile().getAbsolutePath()); //This is where you need to change.
        File[] files = directory.listFiles();
        for (File file : files)
        {
            if (file.isFile())
            {
                Scanner scanner = new Scanner(new FileReader(file));
                int lineCount = 0;
                try
                {
                    for (lineCount = 0; scanner.nextLine() != null; lineCount++)
                        ;
                } catch (NoSuchElementException e)
                {
                    result.put(file.getName(), lineCount);
                }
            }
        }

        for (Map.Entry<String, Integer> entry : result.entrySet())
        {
            System.out.println(entry.getKey() + " ==> " + entry.getValue());
        }
    }

This code should replace this section:

Scanner in=new Scanner(System.in);
System.out.println("Enter the Drive name like C,D,E etc");
String drive=in.next();
System.out.println("Enter the main folder name");
String main_folder=in.next();
File directory=new File(drive+":"+"//"+main_folder+"//");

Also, just a recommendation, when working with consoles and system paths, you should ideally use File.seperator. This will automatically provide you with the respective system’s path separation character.

As per your edit, in your case you are using the fileChooser.getSelectedFile();. This will only get you the file that the user has selected, as per its name. What you should use is the fileChooser.getSelectedFile().getAbsolutePath() and iterate over the files which are within that same directory (as shown above).

EDIT 2: I use this code to display 2 buttons with their respective event handlers:

public static void main(String args[]) {
        JFrame frame = new JFrame("Button Sample");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        JButton btnExit= new JButton("EXIT");    

        ActionListener actionListenerExitButton = new ActionListener() {
          @Override
          public void actionPerformed(ActionEvent actionEvent) {
            System.out.println("Exit Button Was Clicked");
          }
        };
        btnExit.addActionListener(actionListenerExitButton);

        JButton btnEnter = new JButton("ENTER");
        ActionListener actionListenerEnterButton = new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent actionEvent) {
                System.out.println("Enter Button Was Clicked");
            }
        };
        btnEnter.addActionListener(actionListenerEnterButton);

        Container contentPane = frame.getContentPane();
        contentPane.add(btnExit, BorderLayout.SOUTH);
        contentPane.add(btnEnter, BorderLayout.NORTH);
        frame.setSize(300, 100);
        frame.setVisible(true);
      }

All that you need to do now is to plug in the code I have provided earlier in the appropriate event handler.