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Is it mandatory to call base class constructor in Java? In C++ it was optional, so I am asking this.
When I extend ArrayAdapter, I get this error: "Implicit super constructor ArrayAdapter<String>() is undefined. Must explicitly invoke another constructor"
So, what is the purpose of calling base constructor? When I create object base class constructor will call & then it comes to derived right.
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implicit constructor is a term commonly used to talk about two different concepts in the language, the. implicitly declared constructor which is a default or copy constructor that will be declared for all user classes if no user defined constructor is provided (default) or no copy constructor is provided (copy).
The process of converting one type of object and variable into another type is referred to as Typecasting. When the conversion automatically performs by the compiler without the programmer's interference, it is called implicit type casting or widening casting.
There are two types of constructors parameterized constructors and no-arg constructors.
The no-args constructor is called implicitly if you don't call one yourself, which is invalid if that constructor doesn't exist. The reason it is required to call a super constructor is that the superclass usually has some state it expects to be in after being constructed, which may include private variables that can't be set in a sub-class. If you don't call the constructor, it would leave the object in a probably invalid state, which can cause all kinds of problems.
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