Question

Objectives:

• GUI

Tasks:

In Lab 4, you have completed a typical function of music player -- sorting song lists. In this assignment, you are asked to design a graphic user interface (GUI) for this function. To start, create a Java project named CS235A4_YourName. Then, copy the class Singer and class Song from finished Lab 4 and paste into the created project (src folder).

Define another class TestSongGUI to implement a GUI application of sorting songs. Your application must provide the above three ways to sorting songs. Use the completed classes Singer and Song from Lab 4 to support this function. Give users some test data (existing song lists) and allow users to directly see different sorting results by clicking their mouse on GUI components (i.e, button, radio button, menu, etc.). You have freedom (and are encouraged) to design your own GUI by using components and other elements (i.e., layout, color, font, etc.) learned from /not from the lectures. Remember, make sure that your application includes at least the following GUI components:

• Label
• Text Area (for song lists)
• Button (for different sorting options)

----Class Singer---

package songs;

public class Singer {

      

       private String lastName; //singer's last name

       private String firstName; //singer's first name

      

       public Singer(String last, String first)

       {

             lastName = last;

             firstName = first;

       }

       public String getLastName() {

             return lastName;

       }

       public void setLastName(String lastName) {

             this.lastName = lastName;

       }

      

       public String getFirstName() {

             return firstName;

       }

       public void setFirstName(String firstName) {

             this.firstName = firstName;

       }

      

       public String toString()

       {

             return firstName + " " + lastName;

       }

}

---Class Song---

package songs;

import java.util.Comparator;

@SuppressWarnings("rawtypes")

public class Song implements Comparable{

       //instance variables

       private String title;

       private int secLength;

       private Singer artist;

       //constructors

       public Song(String title, int secLength, Singer artist)

       {

             this.title = title;

             this.secLength = secLength;

             this.artist = artist;

       }

       public Song(String title, int secLength, String artistLName, String artistFName)

       {

             this.title = title;

             this.secLength = secLength;

             this.artist = new Singer (artistLName, artistFName);

       }

       //toString method

       public String toString()

       {

             String info = title + " " + artist + " " + secLength + " seconds.";

             return info;

       }

       //Return the first name of the artist who sings this song

       public String getArtistFirstName()

       {

             return artist.getFirstName();

       }

       //Return the last name of the artist who sings this song

       public String getArtistLastName()

       {

             return artist.getLastName();

       }

       //getters and setters

       public String getTitle() {

             return title;

       }

       public void setTitle(String title) {

             this.title = title;

       }

       public int getLength() {

             return secLength;

       }

       public void setLength(int length) {

             this.secLength = length;

       }

       public Singer getArtist() {

             return artist;

       }

       public void setSinger(Singer artist) {

             this.artist = artist;

       }

       @Override

       public int compareTo(Object o) {

             Song s1 = (Song)this;

             Song s2 = (Song)o;

             return s1.getTitle().compareTo(s2.getTitle());

       }

       // This is the comparator for comparing the songs by seclenght

       public static Comparator lengthComparator = new Comparator(){

             @Override

             public int compare(Object arg0, Object arg1) {

                    // taking two songs object

                    Song s1 = (Song)arg0;

                    Song s2 = (Song)arg1;

                    // comparing on the basis of sec length

                    return s2.secLength - s1.secLength;

             }     

       };

       public static Comparator singerTitleComparator = new Comparator() {

             @Override

             public int compare(Object o1, Object o2) {

                    Song s1 = (Song)o1;

                    Song s2 = (Song)o2;

                    int compareVal = s1.getArtistLastName().compareTo(s2.getArtistLastName());

                    if(compareVal!=0) {

                           return compareVal;

                    }else {

                           return s1.getTitle().compareTo(s2.getTitle());

                    }

             }

       };

}

Answer 1

Singer.java

public class Singer {

private String lastName; //singer's last names
private String firstName; //singer's first name

public Singer(String last, String first) {
lastName = last;
firstName = first;
}

public String getLastName() {
return lastName;
}

public void setLastName(String lastName) {
this.lastName = lastName;
}

public String getFirstName() {
return firstName;
}

public void setFirstName(String firstName) {
this.firstName = firstName;
}

public String toString() {
return firstName + " " + lastName;
}
}

Song.java

import java.util.Comparator;

@SuppressWarnings("rawtypes")
public class Song implements Comparable {
//instance variables
private String title;
private int secLength;
private Singer artist;

//constructors
public Song(String title, int secLength, Singer artist) {
this.title = title;
this.secLength = secLength;
this.artist = artist;
}

public Song(String title, int secLength, String artistLName, String artistFName) {
this.title = title;
this.secLength = secLength;
this.artist = new Singer(artistLName, artistFName);
}

//toString method
public String toString() {
String info = title + " " + artist + " " + secLength + " seconds.";
return info;
}

//Return the first name of the artist who sings this song
public String getArtistFirstName() {
return artist.getFirstName();
}

//Return the last name of the artist who sings this song
public String getArtistLastName() {
return artist.getLastName();
}

//getters and setters
public String getTitle() {
return title;
}

public void setTitle(String title) {
this.title = title;
}

public int getLength() {
return secLength;
}

public void setLength(int length) {
this.secLength = length;
}

public Singer getArtist() {
return artist;
}

public void setSinger(Singer artist) {
this.artist = artist;
}

@Override
public int compareTo(Object o) {
Song s1 = (Song) this;
Song s2 = (Song) o;
return s1.getTitle().compareTo(s2.getTitle());
}

// This is the comparator for comparing the songs by seclenght
public static Comparator lengthComparator = new Comparator() {
@Override
public int compare(Object arg0, Object arg1) {
// taking two songs object
Song s1 = (Song) arg0;
Song s2 = (Song) arg1;

// comparing on the basis of sec length
return s2.secLength - s1.secLength;
}
};

public static Comparator singerTitleComparator = new Comparator() {
@Override
public int compare(Object o1, Object o2) {
Song s1 = (Song) o1;
Song s2 = (Song) o2;
int compareVal = s1.getArtistLastName().compareTo(s2.getArtistLastName());
if (compareVal != 0)
{
return compareVal;
}
else
{
return s1.getTitle().compareTo(s2.getTitle());
}
}
};
}

TestSongGUI.java (Main class)

import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.io.FileNotFoundException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Scanner;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.ScrollPaneConstants;

public class TestSongGUI {
  
private static JFrame mainFrame;
private static JPanel mainPanel, inputPanel, buttonPanel, resPanel;
private static JLabel fileNameLabel;
private static JTextField fileNameField;
private static JButton loadDataButton, sortBySongTitleButton, sortBySongLengthButton, sortBySingerTitleButton;
private static JTextArea resArea;
  
private static ArrayList<Song> songs = new ArrayList<>();
  
public static void main(String[] args)
{
mainFrame = new JFrame("Song Sorter");
mainPanel = new JPanel(new FlowLayout(FlowLayout.CENTER));
  
inputPanel = new JPanel(new FlowLayout(FlowLayout.CENTER));
fileNameLabel = new JLabel("Enter file name containing song data: ");
fileNameField = new JTextField(20);
loadDataButton = new JButton("Load Songs");
inputPanel.add(fileNameLabel);
inputPanel.add(fileNameField);
inputPanel.add(loadDataButton);
  
buttonPanel = new JPanel(new FlowLayout(FlowLayout.CENTER));
sortBySongTitleButton = new JButton("Sort by Song Title");
sortBySongLengthButton = new JButton("Sort by Song Length");
sortBySingerTitleButton = new JButton("Sort by Singer Title");
buttonPanel.add(sortBySongTitleButton);
buttonPanel.add(sortBySongLengthButton);
buttonPanel.add(sortBySingerTitleButton);
  
resPanel = new JPanel(new FlowLayout(FlowLayout.CENTER));
resArea = new JTextArea(10, 50);
resArea.setEditable(false);
JScrollPane scrollPane = new JScrollPane(resArea);
scrollPane.setBounds(10,60,780,500);
scrollPane.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
resPanel.add(scrollPane);
  
mainPanel.add(inputPanel);
mainPanel.add(buttonPanel);
mainPanel.add(resPanel);
  
mainFrame.add(mainPanel);
mainFrame.setSize(600, 300);
mainFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
mainFrame.setLocationRelativeTo(null);
mainFrame.setVisible(true);
  
// initially the 3 sorting buttons are disabled
// they will be activate once the loading songs is successful
sortBySongTitleButton.setEnabled(false);
sortBySongLengthButton.setEnabled(false);
sortBySingerTitleButton.setEnabled(false);
  
// action listener for load button
loadDataButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if(fileNameField.getText().equals(""))
{
JOptionPane.showMessageDialog(null, "Please enter the song datafile name!");
return;
}
  
String filename = fileNameField.getText().trim();
songs = loadSongs(filename);
  
// data loaded, the 3 sorting buttons are enabled
// and, the filename field and the load button are disabled
sortBySongTitleButton.setEnabled(true);
sortBySongLengthButton.setEnabled(true);
sortBySingerTitleButton.setEnabled(true);
  
fileNameField.setEditable(false);
loadDataButton.setEnabled(false);
}
});
  
// action listener for the sort by song title button
sortBySongTitleButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if(songs.isEmpty())
{
JOptionPane.showMessageDialog(null, "No songs to sort!");
return;
}
  
ArrayList<Song> temp = songs;
Collections.sort(temp);
  
// clear the text area
resArea.setText("");
  
// display the sorted songs
resArea.append("SORT BY SONG TITLE:\n--------------------------------------\n");
for(Song s : temp)
{
resArea.append(s + "\n");
}
}
});
  
// action listener for sort by song length
sortBySongLengthButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if(songs.isEmpty())
{
JOptionPane.showMessageDialog(null, "No songs to sort!");
return;
}
  
ArrayList<Song> temp = songs;
Collections.sort(temp, Song.lengthComparator);
  
// display the sorted songs
resArea.append("SORT BY SONG LENGTH:\n--------------------------------------\n");
for(Song s : temp)
{
resArea.append(s + "\n");
}
}
});
  
// action listener for sort by singer title
sortBySingerTitleButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if(songs.isEmpty())
{
JOptionPane.showMessageDialog(null, "No songs to sort!");
return;
}
  
ArrayList<Song> temp = songs;
Collections.sort(temp, Song.singerTitleComparator);
  
// display the sorted songs
resArea.append("SORT BY SINGER TITLE:\n--------------------------------------\n");
for(Song s : temp)
{
resArea.append(s + "\n");
}
}
});
}
  
private static ArrayList<Song> loadSongs(String filename)
{
ArrayList<Song> songs = new ArrayList<>();
Scanner fileReader;
  
try
{
fileReader = new Scanner(new File(filename));
while(fileReader.hasNextLine())
{
String line = fileReader.nextLine().trim();
String[] data = line.split(",");
// title, length, artLastName, artFirstName
String title = data[0];
int length = Integer.parseInt(data[1]);
String artistLName = data[2];
String artistFName = data[3];
  
songs.add(new Song(title, length, artistLName, artistFName));
}
fileReader.close();
}catch(FileNotFoundException fnfe){
JOptionPane.showMessageDialog(null, filename + " couldn't be found! Exiting...");
System.exit(0);
}
return songs;
}
}

************************************************************** SCREEENSHOT ***********************************************************

INPUT FILE (songdata.txt) - This file needs to be created before running the code. Also, the fields in the file need to be separated by commas.

GUI OUTPUT