Does apex use a hash structure?

Unlike Java, Apex developers do not need to reference the algorithm that is used to implement a set in their declarations (for example, HashSet or TreeSet ). Apex uses a hash structure for all sets. A set is an unordered collection—you can’t access a set element at a specific index. You can only iterate over set elements.

What are automatic properties in apex?

From the Apex Documentation on Automatic Properties. Properties do not require additional code in their get or set accessor code blocks. Instead, you can leave get and set accessor code blocks empty to define an automatic property. Automatic properties allow you to write more compact code that is easier to debug and maintain.

How to make variables read-only in Apex code?

You can make variables read-only by not including set;, and you can make them write-only by not including get;. Inside Apex Code, you can also use these to control readability and writeability. public static Integer counter { get { if (counter == null) counter = 0; counter++; return counter; } private set; }

How to control readability and writeability in Apex code?

Inside Apex Code, you can also use these to control readability and writeability. public static Integer counter { get { if (counter == null) counter = 0; counter++; return counter; } private set; } This counter increases by 1 each time it's used, but can't be set outside of the class that contains it.