Contents
What is the point of protected variables?
The main purpose of protected keyword is to have the method or variable can be inherited from sub classes.
What is the point of a private class in Java?
The best use of private keyword is to create a fully encapsulated class in Java by making all the data members of that class private. If we make any class constructor private, we cannot create the instance of that class from outside the class.
Why we use protected in Java?
Protecting a constructor prevents the users from creating the instance of the class, outside the package. During overriding, when a variable or method is protected, it can be overridden to other subclass using either a public or protected modifier only. Outer class and interface cannot be protected.
Can you inherit a final class?
The main purpose of using a class being declared as final is to prevent the class from being subclassed. If a class is marked as final then no class can inherit any feature from the final class. You cannot extend a final class.
Can we inherit private class in Java?
A java private member cannot be inherited as it is available only to the declared java class. Since the private members cannot be inherited, there is no place for discussion on java runtime overloading or java overriding (polymorphism) features.
Can we inherit private method in java?
Yes. A java private member cannot be inherited as it is available only to the declared java class. Since the private members cannot be inherited, there is no place for discussion on java runtime overloading or java overriding (polymorphism) features.
Why is it bad to make variables public?
Public variables in general in a class are a bad idea. Since this means other classes/programs, can modify the state of instances.
What is the difference between private and protected in OOP?
Protected means that a class and its subclasses have access to the variable, but not any other classes, they need to use a getter/setter to do anything with the variable. A private means that only that class has direct access to the variable, everything else needs a method/function to access or change that data.
What does it mean to have protected variables in Java?
Protected is one of the trickier of the Java access modifiers, but it is not difficult to understand! Protected variables and methods allow the class itself to access them, classes inside of the same package to access them, and subclasses of that class to access them.
Why do we need private variables in Java?
Hence, private variables ensure that the corresponding variable remains in the defining class only. If you need to change it, the change is local to the class itself. In traditional lanugages like C++ or Java, you usually make everything private and only accessible by corresponding getters and setters. No need to decide much really.
Where can I find a private keyword in Java?
A Java private keyword is an access modifier. It can be assigned to variables, methods, and inner classes. It is the most restricted type of access modifier. The private access modifier is accessible only within the same class.
What can a protected keyword DO in Java?
A Java protected keyword is an access modifier. It can be assigned to variables, methods, constructors and inner classes.