Running errors ins MyMusic.java program

[Joniela Geldenhuys]

Hey guys I really need your help! i've been struggling for a week now! I must create a program where I can enter all my favorite music and I must be able to sort the data by genre, artist, greatest hit or record label! my program exit but when I must insert a new artist it does not display on the program and my program does not want to sort! can somebody please tell me what I'm doing wrong! I'm a distance learner and I'm really struggling with this I don't know what to do!!!

 import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.text.*;

public class MyMusic extends JFrame implements ActionListener
{
	//Construct components
	JLabel sortPrompt = new JLabel("Sort by:");
	JComboBox fieldCombo = new JComboBox();
	JTextPane textPane = new JTextPane();

	//initialize data in the arrays
	String artist[] = {"Prime Circle", "Onbeskaamd", "Kurt Darren"};
	String genre[] = {"Rock", "Gospel", "Afrikaans pop"};
	String greatest[] = {"Out of this place", "Onbeskaamd", "Kaptein"};
	String recordLabel[] = {"EMI Music SA", "Maranatha Recording", "SELECT MUSIC"};

	//Construct an instance of MyMusic
	public MyMusic()
	{
		super("Favorite Music");
	}

	//Create the menu system
	public JMenuBar createMenuBar()
	{
		//create an instance of the menu bar
		JMenuBar mnuBar = new JMenuBar();
		setJMenuBar(mnuBar);

		//construct and populate the File menu
		JMenu mnuFile = new JMenu("File", true);
		mnuFile.setMnemonic(KeyEvent.VK_F);
		mnuFile.setDisplayedMnemonicIndex(0);
		mnuBar.add(mnuFile);

		JMenuItem mnuFileExit = new JMenuItem("Exit");
		mnuFileExit.setMnemonic(KeyEvent.VK_X);
		mnuFileExit.setDisplayedMnemonicIndex(1);
		mnuFile.add(mnuFileExit);
		mnuFileExit.setActionCommand("Exit");
		mnuFileExit.addActionListener(this);

		//construct and populate the Edit Menu
		JMenu mnuEdit = new JMenu("Edit", true);
		mnuEdit.setMnemonic(KeyEvent.VK_E);
		mnuEdit.setDisplayedMnemonicIndex(0);
		mnuBar.add(mnuEdit);

		JMenuItem mnuEditInsert = new JMenuItem("Insert New Artist");
		mnuEditInsert.setMnemonic(KeyEvent.VK_I);
		mnuEditInsert.setDisplayedMnemonicIndex(0);
		mnuEdit.add(mnuEditInsert);
		mnuEditInsert.setActionCommand("Insert");
		mnuEditInsert.addActionListener(this);

		JMenu mnuSort = new JMenu("Sort", true);
		mnuSort.setMnemonic(KeyEvent.VK_S);
		mnuSort.setDisplayedMnemonicIndex(0);
		mnuBar.add(mnuSort);

		JMenuItem mnuSortArtist = new JMenuItem("Sort by Artist");
		mnuSortArtist.setMnemonic(KeyEvent.VK_A);
		mnuSortArtist.setDisplayedMnemonicIndex(0);
		mnuSort.add(mnuSortArtist);
		mnuSortArtist.setActionCommand("SortArtist");
		mnuSortArtist.addActionListener(this);

		JMenuItem mnuSortGenre = new JMenuItem("Sort by Genre");
		mnuSortGenre.setMnemonic(KeyEvent.VK_G);
		mnuSortGenre.setDisplayedMnemonicIndex(1);
		mnuSort.add(mnuSortGenre);
		mnuSortGenre.setActionCommand("SortGenre");
		mnuSortGenre.addActionListener(this);

		JMenuItem mnuSortGreatest = new JMenuItem("Sort by Greatest Hit");
		mnuSortGreatest.setMnemonic(KeyEvent.VK_H);
		mnuSortGreatest.setDisplayedMnemonicIndex(2);
		mnuSort.add(mnuSortGreatest);
		mnuSortGreatest.setActionCommand("SortGreatest");
		mnuSortGreatest.addActionListener(this);

		JMenuItem mnuSortLabel = new JMenuItem("Sort by Record Label");
		mnuSortLabel.setMnemonic(KeyEvent.VK_L);
		mnuSortLabel.setDisplayedMnemonicIndex(3);
		mnuSort.add(mnuSortLabel);
		mnuSortLabel.setActionCommand("SortLabel");
		mnuSortLabel.addActionListener(this);

		return mnuBar;
	}//end public JMenuBar createMenuBar()

	//create the content pane
	public Container createContentPane()
	{
		//create the JTextPane and center panel
		JPanel centerPanel = new JPanel();
		setTabsAndStyles(textPane);
		textPane = addTextToTextPane();
		JScrollPane scrollPane = new JScrollPane(textPane);

		scrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);

		scrollPane.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
		scrollPane.setPreferredSize(new Dimension(900, 200));
		centerPanel.add(scrollPane);

		//create Container and set attributes
		Container c = getContentPane();
		c.setLayout(new BorderLayout(10, 10));
		c.add(centerPanel, BorderLayout.CENTER);

		return c;

	}//end public container createContentPane()

	//method to create tab stops and set font styles
	protected void setTabsAndStyles(JTextPane textPane)
	{
		//create Tab stops
		TabStop[] tabs = new TabStop[4];
		tabs[0] = new TabStop(210, TabStop.ALIGN_LEFT, TabStop.LEAD_NONE);
		tabs[1] = new TabStop(410, TabStop.ALIGN_LEFT, TabStop.LEAD_NONE);
		tabs[2] = new TabStop(450, TabStop.ALIGN_LEFT, TabStop.LEAD_NONE);
		tabs[3] = new TabStop(715, TabStop.ALIGN_LEFT, TabStop.LEAD_NONE);

		TabSet tabset = new TabSet(tabs);

		//set Tab Style
		StyleContext tabStyle = StyleContext.getDefaultStyleContext();
		AttributeSet aset = tabStyle.addAttribute(SimpleAttributeSet.EMPTY, StyleConstants.TabSet, tabset);
		textPane.setParagraphAttributes(aset, false);
		textPane.setEditable(false);

		//set Font Style
		Style fontStyle =
		StyleContext.getDefaultStyleContext().getStyle(StyleContext.DEFAULT_STYLE);

		Style regular = textPane.addStyle("regular", fontStyle);
		StyleConstants.setFontFamily(fontStyle, "Courier new");

		Style s = textPane.addStyle("Italic", regular);
		StyleConstants.setItalic(s, true);

		s = textPane.addStyle("bold", regular);
		StyleConstants.setBold(s, true);

		s = textPane.addStyle("large", regular);
		StyleConstants.setFontSize(s, 16);
	}//end protected void setTabsAnsStyles(JTextPane textPane)

	//method to add new text to the JTextPane
	public JTextPane addTextToTextPane()
	{
		Document doc = textPane.getDocument();
		try
		{
			//clear previous text
			doc.remove(0, doc.getLength());

			//insert title
			doc.insertString(0,"ARTIST\tGENRE\tGREATEST HIT\tRECORD LABEL\n", textPane.getStyle("large"));

			//insert detail
			for (int j = 0; j<artist.length; j++)
			{
				doc.insertString(doc.getLength(), artist[j] + "\t", textPane.getStyle("bold"));
				doc.insertString(doc.getLength(), genre[j] + "\t", textPane.getStyle("regular"));
				doc.insertString(doc.getLength(), greatest[j] + "\t", textPane.getStyle("regular"));
				doc.insertString(doc.getLength(), recordLabel[j] + "\t", textPane.getStyle("regular"));
			}
		}//end try
		catch (BadLocationException ble)
		{
			System.err.println("Couldn't insert text");
		}
		return textPane;
	}

	//event to process user clicks
	public void actionPerformed(ActionEvent e)
	{
		String arg = e.getActionCommand();

		//user clicks Exit on the File Menu
		if(arg.equals("Exit"))
		System.exit(0);

		//user clicks Insert New Artist on the Edit Menu
		if(arg.equals("Insert"))
		{
			//accept new data
			String newArtist = JOptionPane.showInputDialog(null, "Please enter new Artist's name");
			String newGenre = JOptionPane.showInputDialog(null, "Please enter the new genre");
			String newGreatest = JOptionPane.showInputDialog(null, "Please enter" + newArtist + "s greatest hit");
			String newRecordLabel = JOptionPane.showInputDialog(null, "Please enter" + newArtist + "s record label");

			//enlarge arrays
			artist = enlargeArray(artist);
			genre = enlargeArray(genre);
			greatest = enlargeArray(greatest);
			recordLabel = enlargeArray(recordLabel);

			//add new data to arrays
			artist[artist.length-1] = newArtist;
			genre[genre.length-1] = newGenre;
			greatest[greatest.length-1] = newGreatest;
			recordLabel[recordLabel.length-1] = newRecordLabel;

			//call sort method
			sort(artist);
		}

		if(arg.equals("Sort Artist"))
		{
			sort(artist);
		}
		if(arg.equals("Sort Genre"))
		{
			sort(genre);
		}
		if(arg.equals("Sort Greatest"))
		{
			sort(greatest);
		}
		if(arg.equals("Sort Label"))
		{
			sort(recordLabel);
		}

	}//end public void actionPerformed(AcetionEvent e)

	//method to enlarge an array by 1
	public String[] enlargeArray(String[] currentArray)
	{
		String[] newArray = new String[currentArray.length + 1];
		for (int i=0; i<currentArray.length; i++)
		newArray[i] = currentArray[i];
		return newArray;
	}//end public String[] enlargeArray(String[]currentArray)

	//method to sort arrays
	public void sort(String tempArray[])
	{
		//loop to control number of passes
		for(int pass = 1; pass<tempArray.length; pass++)
		{
			for(int element = 0; element<tempArray.length-1; element++)
			{
				if (tempArray[element].compareTo(tempArray[element + 1])>0)
				{
					swap(artist, element, element + 1);
					swap(genre, element, element + 1);
					swap(greatest, element, element + 1);
					swap(recordLabel, element, element + 1);
				}
			}
		}
	}

	//method to swap to elements of an array
	public void swap(String swapArray[], int first, int second)
	{
		String hold; //temporary holding area for swap
		hold = swapArray[first];
		swapArray[first] = swapArray[second];
		swapArray[second] = hold;
	}//end public void swap(String swapArray[], int first, int second)

	//main method executes at run time
	public static void main(String args[])
	{
		JFrame.setDefaultLookAndFeelDecorated(false);
		MyMusic f = new MyMusic();
		f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		f.setJMenuBar(f.createMenuBar());
		f.setContentPane(f.createContentPane());
		f.setSize(900, 375);
		f.setVisible(true);
	}//end public static void main(String args[])
}

[Campbell Ritchie]

You are going about it the wrong way. Get it working at the command-line, then add a GUI later.