How can I put the file contents in to a JList

Question

How can I put the contents of the examplefile.dat into the Jlist examplefile.dat

evan:joe:lance:steve

the names separated by colon would be converted to array and put it in the JList or JComboBox

here's my code to Load and print the file

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.*;
import java.util.Scanner;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.*;

public class FileScanner {

    /**
     * @param args the command line arguments
     * @throws FileNotFoundException
     * @throws IOException  
     */
    public static void main(String[] args) throws FileNotFoundException, IOException {
        JPanel panel = new JPanel();
        JFrame frame = new JFrame();
        final JTextField input0 = new javax.swing.JTextField(20);
        JButton load = new javax.swing.JButton("Load");
        frame.add(panel);
        frame.setSize(240,200);
        panel.add(input0);
        panel.add(load);


        frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        frame.setVisible(true);
        load.addActionListener(new ActionListener() {
                            @Override
                            public void actionPerformed(ActionEvent e) {
                                 FileReader fin = null;
                                 String filename = input0.getText();
                            try {
                                 fin = new FileReader(filename);
                                } catch (FileNotFoundException ex) {
                                   Logger.getLogger(FileScanner.class.getName()).log(Level.SEVERE, null, ex);
                                }
                                 Scanner src = new Scanner(fin);
                                 src.useDelimiter(":");
                                 while (src.hasNext()) {
                                 String lol = src.nextLine();
                                 System.out.println(lol); 
                                }
                                } 
                                });


        }
}

Ok this is my Code..

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.util.Scanner;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.DefaultListModel;
import javax.swing.DefaultListSelectionModel;
import javax.swing.ListSelectionModel;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

/**
 *
 * @author Jfetizanan
 */
public class IOtestForm extends javax.swing.JFrame {

    /**
     * Creates new form IOtest
     */
    public IOtestForm() {
        initComponents();
    }

    /**
     * This method is called from within the constructor to initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is always
     * regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">
    private void initComponents() {

        jScrollPane1 = new javax.swing.JScrollPane();
        list = new javax.swing.JList();
        input0 = new javax.swing.JTextField();
        load = new javax.swing.JButton();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        jScrollPane1.setViewportView(list);
        DefaultListSelectionModel m = new DefaultListSelectionModel();
        m.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
        m.setLeadAnchorNotificationEnabled(false);
        list.setSelectionModel(m);
        list.addListSelectionListener(new ListSelectionListener() {
            @Override
        public void valueChanged(ListSelectionEvent e) {
        int selected[] = list.getSelectedIndices();
        for (int i = 0; i < selected.length; i++) {
        String element = (String) list.getModel().getElementAt(selected[i]);
        input0.setText(element);
        }}});

        load.setText("Load");
        load.addActionListener(new ActionListener() {
                            @Override
            @SuppressWarnings("unchecked")
                            public void actionPerformed(ActionEvent e) {
                                 FileReader fin = null;
                            try {
                                 fin = new FileReader("data.dat");
                                } catch (FileNotFoundException ex) {
                                   Logger.getLogger(IOtestForm.class.getName()).log(Level.SEVERE, null, ex);
                                }
                                 Scanner src = new Scanner(fin);
                                 src.useDelimiter("\n");
                                DefaultListModel model = new DefaultListModel();
                                while (src.hasNext()) {
                                String lol = src.nextLine();
                                model.addElement(lol);
                                }
                                list.setModel(model);
                                } 
                                });

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 380, Short.MAX_VALUE)
                    .addComponent(input0)
                    .addComponent(load, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
                .addContainerGap())
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addGap(13, 13, 13)
                .addComponent(load)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                .addComponent(input0, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(94, Short.MAX_VALUE))
        );

        pack();
    }// </editor-fold>

    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {

        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(IOtestForm.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }

        java.awt.EventQueue.invokeLater(new Runnable() {

            @Override
            public void run() {
                new IOtestForm().setVisible(true);
            }
        });
    }
    // Variables declaration - do not modify
    private javax.swing.JTextField input0;
    private javax.swing.JScrollPane jScrollPane1;
    private javax.swing.JList list;
    private javax.swing.JButton load;
    // End of variables declaration
}

@MadProgrammer look at the new code I post.. what It does is it load the file and show everything inside it in a JList and when I click it.. It shows the line in a textarea.. But I want the Jlist to display only the number in the list and when I click it. It displays the rest of the Characters in the rest of the string in the line

this must be the content of the data.dat

1 lol

2 lol

3 lol

4 lol

*don't mind the space between the lines

Answer 1

JList list = new JList(); // You need to create the JList first
JScrollPane scrollPane = new JScrollPane(list);
// Add the scrollpane to the UI

...

// At some time in the future, load the results...
DefaultListModel model = new DefaultListModel();
while (src.hasNext()) {
    String lol = src.nextLine();
    model.addElement(lol);
}
list.setModel(model);

Perhaps you'd like to take a read of

• How to use Lists
• How to use Combo Boxes

For some more useful information