public class MyException extends Exception
{
    private static final long serialVersionUID = 1L;
    private Type type;

    public MyException( Type type )
    {
        super();
        this.type = type;
    }
    public MyException( Throwable t, Type type )
    {
        super( t );
        this.type = type;
    }
    public String toString() {
        return super.toString() + "<" + getErrorType().getErrorCode() + ">";
    }

    public Type getErrorType()
    {
        return type;
    }

    public enum Type
    {
        // 系統錯誤
        SYSTEM_ERROR( "99999" ),

        // 用戶認證錯誤
        USER_AUTH( "03003" );

        private String errorCode;
        Type( String errorCode )
        {
            this.errorCode = errorCode;
        }
        public String getErrorCode()
        {
            return this.errorCode;
        }
    }
}