Java SE (Java Platform, Standard Edition)

I've been looking all over the forums trying to find a UI key reference (with a list of keys to use with UIManager.put(Object key, Object value)).

All I could find was a java program someone wrote to display all keys in a GUI Window...but It doesn't work with my JRE/JDK (1.6). I noticed that one of the errors was that whomever had written the program had used the variable name enum, which is now a keyword and cannot be used as a variable name. So I changed it, and tried to run it, and I get the following error:

Exception in thread "main" java.lang.ClassCastException: java.lang.StringBuffer cannot be cast to java.lang.Comparable
	at java.util.TreeMap.put(Unknown Source)
	at ShowUIDefaults.getTabbedPane(ShowUIDefaults.java:80)
	at ShowUIDefaults.<init>(ShowUIDefaults.java:23)
	at ShowUIDefaults.main(ShowUIDefaults.java:230)

I have no idea as to how to fix the code so it will run with java SE 1.6.

Can anyone help me out?

here is the code for the program I found:

import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;
import javax.swing.plaf.*;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.TableCellRenderer;
 
public class ShowUIDefaults extends JFrame implements ActionListener {
	JFrame frame;
	JTabbedPane tabbedPane;
	JButton metal;
	JButton windows;
	JButton motif;
	SampleRenderer sampleRenderer;
 
	public ShowUIDefaults(String title) {
		super(title);
		frame = this;
 
		getContentPane().setLayout(new BorderLayout());
		tabbedPane = getTabbedPane();
		getContentPane().add(tabbedPane);
 
		JPanel buttons = new JPanel();
		buttons.setLayout(new GridLayout(1, 3));
		getContentPane().add(buttons, BorderLayout.SOUTH);
 
		metal = new JButton("Metal");
		metal.addActionListener(this);
		buttons.add(metal);
 
		windows = new JButton("Windows");
		windows.addActionListener(this);
		buttons.add(windows);
 
		motif = new JButton("Motif");
		motif.addActionListener(this);
		buttons.add(motif);
	}
 
	public void actionPerformed(ActionEvent e) {
		String laf = "";
		Object o = e.getSource();
 
		if (o == metal) {
			laf = "javax.swing.plaf.metal.MetalLookAndFeel";
		}
		else if (o == windows) {
			laf = "com.sun.java.swing.plaf.windows.WindowsLookAndFeel";
		}
		else if (o == motif) {
			laf = "com.sun.java.swing.plaf.motif.MotifLookAndFeel";
		}
 
		try {
			UIManager.setLookAndFeel(laf);
		}
		catch (Exception e2) {
			System.out.println(e2);
		}
 
		getContentPane().remove(tabbedPane);
		tabbedPane = getTabbedPane();
		getContentPane().add(tabbedPane);
		SwingUtilities.updateComponentTreeUI(frame);
		frame.pack();
	}
 
	private JTabbedPane getTabbedPane() {
		Map components = new TreeMap();
 
		UIDefaults defaults = UIManager.getDefaults();
 
		//  Build of Map of attributes for each component
 
		for (Enumeration enum = defaults.keys(); enum.hasMoreElements();) {
			Object key = enum.nextElement();
			Object value = defaults.get(key);
 
			Map componentMap = getComponentMap(components, key.toString());
 
			if (componentMap != null) {
				componentMap.put(key, value);
			}
		}
 
		JTabbedPane pane = new JTabbedPane(SwingConstants.BOTTOM);
		pane.setPreferredSize(new Dimension(800, 400));
		addComponentTabs(pane, components);
 
		return pane;
	}
 
	private Map getComponentMap(Map components, String key) {
		if (key.startsWith("class") | key.startsWith("javax")) {
			return null;
		}
 
		//  Component name is found before the first "."
 
		String componentName;
 
		int pos = key.indexOf(".");
 
		if (pos == -1) {
			if (key.endsWith("UI")) {
				componentName = key.substring(0, key.length() - 2);
			}
			else {
				componentName = "System Colors";
			}
		}
		else {
			componentName = key.substring(0, pos);
		}
 
		//  Get the Map for this particular component
 
		Object componentMap = components.get(componentName);
 
		if (componentMap == null) {
			componentMap = new TreeMap();
			components.put(componentName, componentMap);
		}
 
		return (Map) componentMap;
	}
 
	private void addComponentTabs(JTabbedPane pane, Map components) {
		sampleRenderer = new SampleRenderer();
 
		String[] colName = {"Key", "Value", "Sample"};
		Set c = components.keySet();
 
		for (Iterator ci = c.iterator(); ci.hasNext();) {
			String component = (String) ci.next();
			Map attributes = (Map) components.get(component);
 
			Object[][] rowData = new Object[attributes.size()][3];
			int n = 0;
 
			Set a = attributes.keySet();
 
			for (Iterator ai = a.iterator(); ai.hasNext(); n++) {
				String attribute = (String) ai.next();
				rowData[n][0] = attribute;
				Object o = attributes.get(attribute);
 
				if (o != null) {
					rowData[n][1] = o.toString();
					rowData[n][2] = "";
 
					if (o instanceof Font) {
						rowData[n][2] = (Font) o;
					}
 
					if (o instanceof Color) {
						rowData[n][2] = (Color) o;
					}
 
					if (o instanceof IconUIResource) {
						rowData[n][2] = (Icon) o;
					}
				}
				else {
					rowData[n][1] = "";
					rowData[n][2] = "";
				}
 
			}
 
			MyTableModel myModel = new MyTableModel(rowData, colName);
			JTable table = new JTable(myModel);
			table.setDefaultRenderer(sampleRenderer.getClass(), sampleRenderer);
			table.getColumnModel().getColumn(0).setPreferredWidth(250);
			table.getColumnModel().getColumn(1).setPreferredWidth(500);
			table.getColumnModel().getColumn(2).setPreferredWidth(50);
 
			pane.addTab(component, new JScrollPane(table));
		}
	}
 
	class MyTableModel extends AbstractTableModel {
		private String[] columnNames;
		private Object[][] rowData;
 
		public MyTableModel(Object[][] rowData, String[] columnNames) {
			this.rowData = rowData;
			this.columnNames = columnNames;
		}
 
		public int getColumnCount() {
			return columnNames.length;
		}
 
		public int getRowCount() {
			return rowData.length;
		}
 
		public String getColumnName(int col) {
			return columnNames[col];
		}
 
		public Object getValueAt(int row, int col) {
			return rowData[row][col];
		}
 
		public Class getColumnClass(int c) {
			Object o;
 
			if (c == 2) {
				o = sampleRenderer;
			}
			else {
				o = getValueAt(0, c);
			}
 
			return o.getClass();
		}
 
		public void setValueAt(Object value, int row, int col) {
			rowData[row][col] = value;
			fireTableCellUpdated(row, col);
		}
	}
 
	class SampleRenderer extends JLabel implements TableCellRenderer {
		public SampleRenderer() {
			super();
			setHorizontalAlignment(SwingConstants.CENTER);
			setOpaque(true);  //MUST do this for background to show up.
		}
 
		public Component getTableCellRendererComponent(JTable table,
																	  Object sample,
																	  boolean isSelected,
																	  boolean hasFocus,
																	  int row,
																	  int column) {
			setBackground(null);
			setIcon(null);
			setText("");
 
			if (sample instanceof Color) {
				setBackground((Color) sample);
			}
 
			if (sample instanceof Font) {
				setText("Sample");
				setFont((Font) sample);
			}
 
			if (sample instanceof Icon) {
				setIcon((Icon) sample);
			}
 
			return this;
		}
	}
 
	public static void main(String[] args) {
		//  Set the Look and Feel
 
		try {
			UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
		}
		catch (Exception e) {
		}
 
//    UIManager.put("TabbedPane.selected", new Color( 255, 0, 0) );
//    UIManager.put("ScrollBar.width", new Integer(24) );
 
		// The attributes of each component will be shown on a separate tab
 
		JFrame f = new ShowUIDefaults("UI Defaults");
		f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		f.pack();
		f.setVisible(true);
	}
 
}