I have read we can only instantiate an abstract class by inheriting it, but we cannot instantiate it directly.
However, I saw we can create an object with the type of an abstract class by calling a method of another class.
For example - LocationProvider
is an abstract class, and we can instantiate it by calling getProvider()
function in the LocationManager
class:
LocationManager lm = getSystemService(Context.LOCATION_PROVIDER);
LocationProvider lp = lm.getProvider("gps");
How is the abstract class instantiate here?
According to others said, you cannot instantiate from abstract class. but it exist 2 way to use it. 1. make another non-abstact class that extends from abstract class. So you can instantiate from new class and use the attributes and methods in abstract class.
public class MyCustomClass extends YourAbstractClass {
/// attributes, methods ,...
}
No, you can never instantiate an abstract class. That's the purpose of an abstract class. The getProvider
method you are referring to returns a specific implementation of the abstract class. This is the abstract factory pattern.
No, abstract class can never be instantiated.
Source: Stackoverflow.com