自定义readLine

class MyBufferedReader
{
	private FileReader fileReader;
	public MyBufferedReader(FileReader fileReader)
	{
		this.fileReader = fileReader;
	}

	public String myReadLine()
	{
		try
		{
			StringBuffer sb =new StringBuffer();
			int ch = 0;
			while((ch = fileReader.read()) != -1)
			{
				if(ch == '\r')
					continue;
				if(ch == '\n')
					return sb.toString();
				else
					sb.append((char)ch);
			}
			if(sb.length() != 0)
			{
				return sb.toString();
			}
			return null;
		}
		catch (IOException ex)
		{
			ex.getMessage();
		}
	}

	public void myClose()
	{
		try
		{
			fileReader.close();
		}
		catch (IOException ex)
		{
			ex.getMessage();
		}
	}
}