A Log singleton in java

I needed a simple logger in java. I wrote a quick singleton. I sort of want to keep this around if I ever need to use it again, so I thought I would post it here.

Note: Feel free to complain about this singleton using my own code style and not the java code style. :-)

package ClinicSoft.Singletons;

import java.io.File;
import java.io.FileWriter;

public class Log
{
	public static Log Instance = new Log();

	private String _FileName;
	private String _Extension = ".log";
	private int _LogId = -1;

	private Log()
	{
		SetFileName("ClinicSoft");
	}

	public String GetFileName()
	{
		if (_LogId > -1)
			return _FileName + "." + _LogId + _Extension;
		else
			return _FileName + _Extension;
	}

	// The root file name, without the extension
	public void SetFileName(String inFileName)
	{
		_FileName = inFileName;
		while (FileExists(GetFileName()))
			_LogId++;
	}

	private boolean FileExists(String inFile)
	{
		return new File(inFile).exists();
	}

	public static void WriteLine(String inLogMessage)
	{
		Log.Instance.WriteLog(inLogMessage
				+ System.getProperty("line.separator"));
	}

	public void WriteLog(String inLogMessage)
	{
		try
		{
			// Create file
			FileWriter file = new FileWriter(GetFileName(), true);
			file.write(inLogMessage);

			// Close the output stream
			file.close();
		}
		catch (Exception e)
		{
			// Catch exception if any
			System.err.println("Error: " + e.getMessage());
		}
	}
}

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