Question

*Use Java to create this program*

For this assignment, you will be building a Favorite Songs application. The application should have a list with the items displayed, a textbox for adding new items to the list, and four buttons: Add, Remove, Load, and Save. The Add button takes the contents of the text field (textbox) and adds the item in it to the list. Your code must trim the whitespace in front of or at the end of the input in the text field. Infix whitespace is okay (e.g., “happy birthday” – the trim method will not remove the space between the words “happy” and “birthday”.) Also, the text in the textbox should be converted to a lowercase representation (e.g., “Awake and Alive” is converted to “awake and alive”). The Remove button removes a selected item from the list. The list should allow the user to select more than one item at a time. If no items are selected when the user clicks this remove button, then the application should pop up a message box saying, “Please select an item to delete!” The Load button loads the previously saved song list into the list widget on your interface. The Save button saves a copy of the song list to a file, named songs.txt. If the list.txt file doesn’t exist, this operation creates it. If it does exist, it will simply overwrite it. You should produce a user-friendly interface of your own design.

Answer 1

COMMENT IF YOU HAVE DOUBTS AND LIKE THE ANSWER.

//-------- SongManager.java ---------

import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.MatteBorder;
import javax.swing.border.TitledBorder;

import java.io.*;
import java.util.*;;

public class SongManager extends JFrame implements ActionListener {

   JPanel leftPanel;
   JPanel rightPanel;
   JButton add, remove, load, save;
   JTextField songName;
   JList<String> songsList;

   SongManager() {
       setLayout(null);
       setSize(850, 500);
       add = new JButton("Add Song");
       add.setBounds(50, 100, 120, 30);
       remove = new JButton("Remove Song");
       remove.setBounds(180, 100, 120, 30);

       load = new JButton("Load Songs");
       load.setBounds(50, 150, 120, 30);

       save = new JButton("Save Songs");
       save.setBounds(180, 150, 120, 30);

       JLabel label = new JLabel("Enter Song Name: ");
       label.setBounds(20, 40, 130, 30);

       songName = new JTextField(20);
       songName.setBounds(170, 40, 200, 30);

       leftPanel = new JPanel(null);
       leftPanel.setBorder(new TitledBorder("Song Management"));
       leftPanel.setBounds(10, 10, 400, 300);
       leftPanel.add(label);
       leftPanel.add(songName);
       leftPanel.add(add);
       leftPanel.add(remove);
       leftPanel.add(load);
       leftPanel.add(save);

       rightPanel = new JPanel();
       rightPanel.setBorder(new TitledBorder("Songs List"));

       songsList = new JList<String>(new DefaultListModel<String>());

       songsList.setBounds(430, 10, 350, 400);
       songsList.setFixedCellWidth(320);

       rightPanel.add(songsList);
       rightPanel.setBounds(430, 10, 350, 400);
       add(leftPanel);
       add(rightPanel);
       add.addActionListener(this);
       remove.addActionListener(this);
       load.addActionListener(this);
       save.addActionListener(this);
   }

   public void actionPerformed(ActionEvent ae) {
       if (ae.getSource() == add) {
           String song = songName.getText().trim().toLowerCase();
           if (song.equals("")) {
               JOptionPane.showMessageDialog(this, "Warning enter some text in input box and then click Add",
                       "Warning", JOptionPane.WARNING_MESSAGE);
               return;
           }
           ((DefaultListModel) songsList.getModel()).addElement(song);
           songName.setText("");
       } else if (ae.getSource() == remove) {
           DefaultListModel dlm = (DefaultListModel) songsList.getModel();
           int count = songsList.getSelectedIndices().length;
           if(count == 0)
           {
               JOptionPane.showMessageDialog(this, "Please select an item to delete!", "Warning",
                       JOptionPane.WARNING_MESSAGE);
               return;
           }
           for (int i = 0; i < count; i++) {
               dlm.removeElementAt(songsList.getSelectedIndex());
           }
       } else if (ae.getSource() == load) {
           List<String> songs = loadSongs("songs.txt");
           if (songs.isEmpty()) {
               JOptionPane.showMessageDialog(this, "No songs in the file songs.txt", "Information",
                       JOptionPane.INFORMATION_MESSAGE);
               return;
           }

           else
           {
               JOptionPane.showMessageDialog(this, "Loaded " +songs.size() +" songs from songs.txt", "Success",
                       JOptionPane.INFORMATION_MESSAGE);
           }
           for (String song : songs) {
               if (!song.equals("")) {
                   ((DefaultListModel) songsList.getModel()).addElement(song);
               }
           }
       } else if (ae.getSource() == save) {
           saveSongsList("songs.txt");
       }

   }

   public void saveSongsList(String fileName) {
       try {
          
           BufferedWriter bw = new BufferedWriter(new FileWriter(new File(fileName)));
           for (int i = 0; i < songsList.getModel().getSize(); i++) {
               bw.write(songsList.getModel().getElementAt(i) + "\n");
           }
           bw.close();
           JOptionPane.showMessageDialog(this, "Added " + songsList.getModel().getSize() +" songs in songs.txt", "Success",
                   JOptionPane.INFORMATION_MESSAGE);
       } catch (Exception e) {
           JOptionPane.showMessageDialog(this, "Error occured while loading songs in file: " + fileName, "Error",
                   JOptionPane.ERROR_MESSAGE);
       }

   }

   public List<String> loadSongs(String fileName) {
       List<String> list = new ArrayList<>();
       try {

           BufferedReader br = new BufferedReader(new FileReader(new File(fileName)));
           String line = br.readLine();
           int i = 0;
           while (line != null) {
               line = line.trim().toLowerCase();
               list.add(line);
               line = br.readLine();
               i++;
           }
           br.close();

       } catch (Exception e) {
           JOptionPane.showMessageDialog(this, "Error occured while loading songs in file: " + fileName, "Error",
                   JOptionPane.ERROR_MESSAGE);
       }
       return list;
   }

   public static void main(String[] args) {
       SongManager manager = new SongManager();
       manager.setTitle("Song Manger");
       manager.setVisible(true);
       manager.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   }

}