Scala Class Learning

Scala source files can have many classes (class), which are public by default.

In Scala, declaring a field that is not decorated with priavate var Age,scala compiler will automatically help us to produce a private field and 2 public method get and set, which is similar to the simple properties of C #;

Stu.age = 10 (where age is def age = (x$1:int): Unit)

println (Stu.age) (where age is def Age:int)

If the private modifier is used, its methods will also be private. This is the so-called unified access principle.

There is also a common way to define this:

private [This] var gender = "Male"//means that the property belongs to the current instance only, even methods inside the class cannot access the property

Scala Object:
Scala does not have static modifiers, but the members under object are static, and if there is a class with the same name, it is the associated class. In object, you can usually do some initialization for the associated class.

Class constructor:

Each class has a default constructor, this (), and the overloaded (subordinate) constructors need to call the main constructor directly or indirectly (that is, call the other satellite constructors) this ()

If you want to disallow calling the main constructor this when you instantiate a class, use the private keyword when defining the class, for example: Class Teacher private{}

Scala Class Learning