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What is an apex method?
In Apex, all primitive data type arguments, such as Integer or String, are passed into methods by value. Non-primitive data type arguments, such as sObjects, are passed into methods by reference. Therefore, when the method returns, the passed-in argument still references the same object as before the method call.
What are the access modifiers in the apex?
Apex allows you to use the private , protected , public , and global access modifiers when defining methods and variables.
Can a class extend an interface?
A class can’t extend an interface because inheriting from a class ( extends ), and implementing an interface ( implements ) are two different concepts. Hence, they use different keywords.
What happens when you extend a class in apex?
You can extend a class to provide more specialized behavior. A class that extends another class inherits all the methods and properties of the extended class. In addition, the extending class can override the existing virtual methods by using the override keyword in the method definition.
How to write an apex class in Java?
Apex class is a collection of data members and methods. Let us learn how to write an Apex Class. To write an Apex class navigate to Developer Console | File | New | Apex Class.
Can a subclass override a parent class in apex?
// Because it is declared virtual it can be overridden by a subclass. // Implementation of the second interface method above. // Abstract class (that subclasses the class above). No constructor is needed since // Override the parent class method with this signature. // Same name as parent class method, but different signature.
How does a class implement an interface in apex?
A class that implements an interface (and, therefore, its associated sub-interface) by implementing public versions of the method signatures Initialization code outside of constructors — both where variables are defined, as well as with anonymous blocks in curly braces ( {} ).