An abstract method may indeed be declared protected. If you do this, you can use its subclasses or classes in the same package to access it. (You must override and call an abstract method from the subclass.)
Can protected method be called?
The protected access modifier enables your subclasses to reside outside the package of your superclass while still inheriting its methods and constructors. The subclass can only use inheritance to gain access to the protected methods.
What does it mean when a method is protected in Java?
Protected in Java denotes that the member is accessible to all classes in the same package as well as subclasses, even if they are in different packages. Note An external view of a protected variable is not possible. As an illustration, class B extends class A, and class A has a protected int x that can be used by class B.
Can we make method protected in Java?
Although methods and fields can be declared protected, an interface’s methods and fields cannot. Protected access allows the subclass to access the helper variable or method while preventing attempts by unrelated classes to do so.
Can we declare protected class in Java?
No, a top-level class cannot be made private or protected. It may be default or public (no modifier).
Can protected method be overridden?
Yes, a subclass may override a superclass’s protected method. The subclass overridden method cannot have a weaker access specifier if the superclass method is protected. Instead, it can have protected or public access (but not default or private).
Can we declare static methods as private?
In Java 9, it is possible to include private methods or private static methods in an interface.
What is difference between private and protected?
Private information is only accessible to members of the class. Protected items can be seen in both the class and its subclasses.
Is protected the same as public?
The distinction between public and protected is that public can be accessed from outside the class, whereas protected cannot.
Are protected methods final in Java?
1) Private methods are irreversible. 2) Inherited classes outside of a package can access protected members of the package. Protected methods have the last word.
Can we override static method in Java?
Static binding is used to bond static methods at compile time. Therefore, in Java, static methods cannot be overridden.
Why we Cannot declare class as protected?
Class is defined as protected, so it cannot be extended from a package outside of its own (not visible). And since it will then become the default access, which is permitted, if it cannot be extended, maintaining it as protected is pointless.
What is a protected method?
Similar to a private method, a protected method can only be called from within the implementation of a class or one of its subclasses. It differs from a private method in that it is not limited to implicit invocation on self and may be explicitly invoked on any instance of the class.
Is private method are final?
In order to respond to question 2, I would say that all compilers will treat private methods as final. Any overriding of a private method is forbidden by the compiler. Additionally, no compiler will allow subclasses to override final methods.
Can we override private methods?
Java does not allow overriding of static or private methods. The super class method will be hidden if a similar method with the same return type and method arguments is created in a child class; this is referred to as method hiding. Similar to how you cannot access a private method in a subclass, you also cannot override it.
Can constructor be private?
Yes, we are allowed to make a constructor private. We are unable to create an object of a class if we declare a constructor as private. This private constructor can be utilized with the Singleton Design Pattern.
Can abstract class can have constructor?
Even though they are only called from their concrete subclasses, abstract classes in Java are still able to have constructors.
Can class methods be private?
The traditional method for making instance methods of an eigenclass, which are what you typically refer to as class methods, private is to open the eigenclass and use the private keyword on those methods.
Why we use public private and protected?
If a class member is declared as public, then anyone can access it. If a class member is marked as protected, only other classes that inherit from that class and its members will be able to access it. Only the class that defines the member may access a class member if it is declared as private.
What is protected in Java with example?
Definition and application Attributes, methods, and constructors can be made accessible to other members of the same package and subclasses by using the protected keyword as an access modifier.
What is difference between protected and default in Java?
Java Testers’ Guide
In contrast to the Default access specifier, which is a package level access specifier and may be visible in the same package, the Protected access specifier is visible both within the same package and in the subclass.
Why should methods be private?
Private methods are helpful for segmenting tasks into manageable chunks and for avoiding code duplication that is frequently required by other methods in a class but should not be called from outside that class.
What is the difference between a constructor and a method?
An Object is created and initialized using a constructor. Some statements are executed using a method. The System implicitly calls a constructor. Invoking a method requires program code.
Can we have constructor in interface?
In Java, an interface cannot contain a constructor. As of Java 7, you can only have public, static, final variables and public, abstract methods.
Can we declare interface as final?
interface methods cannot be considered final. Cannot be deemed conclusive.
Can we access protected method in child class?
While protected members can be accessed anywhere within the same package, they can only be accessed outside of that package in the child class of the protected member and using the child class’s reference variable, not the parent class’ reference variable. Using the parent class’s reference will prevent us from accessing protected members.
Do subclasses inherit protected methods?
The private members of a parent class are not inherited by a subclass. However, the subclass may also use the public or protected methods that the superclass provides to access its private fields.
Can constructor be overridden?
Constructor appears to be a method but is not one. Its name is the same as the class name and it lacks a return type. A constructor, however, cannot be replaced. The compiler treats it as a method, expects a return type, and produces a compile time error if you attempt to write a constructor for a super class in a sub class.
Can we overload the main () method?
The main method in Java can be overloaded, but when a class is executed, the JVM first calls the public static void main(String[] args) method.
Can we use static in abstract class?
You can define the static method in the abstract class, of course. You can use the abstract class to call that static method, or you can use a child class that extends the abstract class. Additionally, you are able to call static methods via an instance or object of a child class.
Can abstract classes be static?
Yes, static methods are permitted in abstract classes. Static methods, which are closely related to the class itself rather than its instances, are the reason for this.
Can we declare abstract class as final?
Interfaces and abstract classes are similar. They can contain a mixture of methods declared with or without an implementation, and you cannot instantiate them. However, you can declare fields that are not static and final as well as define public, protected, and private concrete methods when using abstract classes.
Can Java inner class be private?
An inner class can be made private, unlike a class, and once it has been made private, it cannot be accessed by objects that are not members of the class. The program to create an inner class and access it is provided below.
Can we override final method in Java?
No, it is not possible to override or hide methods that have been declared final. Because of this, a method should only be declared final when we are certain that it is finished. It is important to note that because abstract methods are incomplete and must be overridden, they cannot be declared final.
Is constructor private or public?
No, constructors can be default, protected, private, or public (no access modifier at all). Even if something is made private, no one will be able to access it. Simply put, it means that only those in the class have access to it. Private constructor is therefore also helpful.
Can we use void with constructor?
Keep in mind that the constructor cannot have a return type and that its name must correspond to the class name (like void ). Also take note that when an object is created, the constructor is called.
What is static method in Java?
A static method in Java is a method that is an instance of a class rather than a member of it. Unlike methods defined in an instance, which can only be accessed by that particular object of a class, a method is accessible to every instance of a class.
What is private void in Java?
For attributes, methods, and constructors, the private keyword is an access modifier that restricts access to the declared class only.
Can we call private method from subclass?
The private members of a parent class are not inherited by a subclass. However, the subclass may also use the public or protected methods that the superclass provides to access its private fields.
Can we override inner class?
Private methods in Java cannot be overridden because they are non-virtual and have a different access than methods that are not private. You simply cannot override them because private methods are not accessible in a subclass and method overriding is only possible on derived classes.
Can we extend abstract class in Java?
When a class is described as abstract in Java, it means that it can never be instantiated but can still be extended by other classes (turned into an object).
Can interface be overridden?
Interface methods can be used, so no. It is necessary to define the method before overloading or overriding it.
Can static methods be private?
In Java 9, it is possible to include private methods or private static methods in an interface.
What is a singleton in Java?
A design pattern called Singleton in Java makes sure that a class can only contain one object. A class must implement the following characteristics in order to be a singleton class: To prevent objects from being created outside of the class, add a private constructor to the class.
Can abstract class have getters and setters?
With the exception of creating a new object solely by using a constructor, you can do everything in an abstract class that you can do in a regular class. The getters and setters from your subclass can thus be easily copied and pasted into your parent class.
Can abstract class have variables?
Instance variables are permitted in abstract classes (these are inherited by child classes). Not interfaces. A concrete class can only extend one other class, to sum up (abstract or otherwise). A concrete class, however, can implement numerous interfaces.
Why should methods be public?
It is harder to test private and protected methods, which is why they should be made public, according to proponents of only using public methods. The same defense can be made to support the absence of package scope methods.
What is the difference between private and protected?
Private information is only accessible to members of the class. Protected items can be seen in both the class and its subclasses.
What is a protected method?
Similar to a private method, a protected method can only be called from within the implementation of a class or one of its subclasses. It differs from a private method in that it is not limited to implicit invocation on self and may be explicitly invoked on any instance of the class.
Why would you make a method private in Java?
Private methods are helpful for segmenting tasks into manageable chunks and for avoiding code duplication that is frequently required by other methods in a class but should not be called from outside that class.
Are Java methods private by default?
Java will establish a default access to a specific class, method, or property when no explicit keyword is used. All members are visible within the same package but are not reachable from other packages when the default access modifier, package-private, is used: package com.
What is polymorphism in oops?
One of the fundamental ideas of object-oriented programming (OOP), polymorphism describes situations where something occurs in a variety of forms. It refers to the idea in computer science that you can access objects of various types through the same interface.
Is protected encapsulation?
Encapsulated variables are those that can only be accessed through getter and setter calls. A variable or method that is protected can only be accessed by code from the same class, from any classes in the same package, and from all subclasses either in the same package or in another one.
What is protected method Java?
Attributes, methods, and constructors can be made accessible to other members of the same package and subclasses by using the protected keyword as an access modifier.