Conventions used

There are a number of text conventions used throughout this book.

Code in text: Indicates code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles. Here is an example: “A parameterized SQL query is created using PreparedStatement, where ? is a placeholder for the user input.”

A block of code is set as follows:

String userInput = getUserInput();
String sqlQuery = "SELECT * FROM users WHERE username = ?";
PreparedStatement preparedStatement = connection.prepareStatement(sqlQuery);
preparedStatement.setString(1, userInput);
ResultSet resultSet = preparedStatement.executeQuery();

Any command-line input or output is written as follows:

They're not equal
They're equal

Bold: Indicates a new term, an important word, or words that you see onscreen. For instance, words in menus or dialog boxes appear in bold. Here is an example: “We can see a START node, from which starts an edge that goes into a conditional node.”

Tips or important notes

Appear like this.