Top Highlights

• Apex is statically typed, which means you must specify the data type for a variable before using it. Apex is also described as being strongly typed; however, it does include methods that return a value as an alternate data type and supports casting. While some other languages might be more flexible, these rules do ensure accurate interpretation by ...
• same concept to keep track of errors, the number of batches, or anything else we need to log in our finish() method.
• these packages have been configured to be accessible by their installers, then you can access them by prefixing the class names with a unique namespace prefix. The namespace prefix allows you to distinguish between two classes with the same name: one that you installed via a package and one that you created yourself in your org's default namespace.
• Apex code is not compiled into Java; it's actually stored as a series of instructions in metadata.
• This code demonstrates how to create and work with all three types of collections. For a complete list of methods unique to each type of collection, refer to Force.com Apex Code Developer's Guide located at http://developer.salesforce.com