Conventions

To help you get the most from the text and keep track of what’s happening, a number of conventions have been used throughout the book.

Examples that you can download and try out for yourself generally appear like this:

Listing: Example Title

  This section provides the code for the example. 

Important 

Boxes like this one hold important, not-to-be forgotten information that is directly relevant to the surrounding text.

Tip 

Tips, hints, tricks, and asides to the current discussion are offset and placed in italics like this.

As for styles in the text:

• Important new terms and important words are shown in italics when they are introduced.

• Keyboard strokes are shown like this: Ctrl+A.

• File names, URLs, and code within the text are shown like this: persistence.properties.

• Code is presented in the following two ways:

    In code examples, new and important code is highlighted with a gray background. 

   The gray highlighting is not used for code that's less important in the pre sent context, or has been shown before.