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What are the differences between class and abstract class?

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Answered 2012-04-05 16:29:03

Normal variables or static variables are declared and use in class but abstract class had only static variables. You have declare and define the methods in class. But abstract class only allow for method declaration only. The abstract class like interface.

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What is difference between abstract class and interface in core java give brief answer with example?

Some differences are:An abstract class can have code for one or more methods but an interface cannotAll variables in an interface are public static and final but in an abstract class it is notAbstract classes are faster than interfaces

What are the differences between an abstract class and an interface in java?

An abstract class may contain code in method bodies, which is not allowed in an interface. With abstract classes, you have to inherit your class from it and Java does not allow multiple inheritance. On the other hand, you can implement multiple interfaces in your class. Source: Refer Related Links

What is similarities between Abstract Class and Interface?

If a class has one abstract method ,the class has to be an abstract class.Methods can be implemented in abstract class.Whereas a interface is like a abstract class...the only difference being that the methods are never implemented in Interface.

What is the difference between abstract class and normal class?

Any class which has one or more abstract methods is called an abstract class. But in the normal class we can't have any abstract methods. We cannot create an object for the abstract classes. When we inherit the abstract class we should implement the abstract method which we inherit.

What is the similarity between abstract class and class?

They provide the same level of abstraction and encapsulation, and similar inheritance. The differences in inheritance: an abstract class forces you to have at least 1 subclass (otherwise this abstraction branch is useless, because you won't be able to create any instance), while a non-abstract class may have optional subclasses.

What is the different between Abstract and a base class in java?

An abstract class(or classes) can't have a constructor and hence you cannot invoke the constructor of the class (for example, you can instantiate an abstract class and hence you cannot call the constructor of an abstract class).

What is difference between abstract class and simple class?

Assume a "simple" class be a class without the keyword "abstract".You cannot create an instance of an abstract class. An abstract class is intended to be inherited from (to be extended or derived from).A "simple" class is a class that an instance can be created from (via new operator)

Difference between abstract and final class?

Abstract class is built to promote inheritance whereas a final class is built to avoid inheritanceAn Abstract class can be extended by another class whereas a final class cannot be extended

What are the main differences between the Class 90 and Class 91?

The main differences between the Class 90 and Class 91 were comfort whereby Class 91 was more comfortable.

What is the difference between a final class and an abstract class?

A final class cannot have any subclasses. An abstract class cannot be instantiated unless it is extended by a subclass.

What are the differences between an interface and an abstract class?

An interface is like a 100% abstract class. Only abstract methods can go in an interface. In addition, all methods in an abstract class are public and abstract by default. You "extend" an interface using the keyword implements. You can implement multiple interfaces, but you have to extend only one class. An interface can have only constants. This means no instance variables.As for an abstract class, you can put both abstract and concrete methods in an abstract class. It can have instance variables, but you can only extend one abstract class.Sun recommends using abstract and concrete class extension to signify what a class is, with an example in the following inheritance tree:Object||-Person||-Programmer||-JavaProgrammerAn interface is for signifying what jobs a class can do, like a Message class implementing a Sendable interface. Also, class names should be nouns and interface names should be adjectives, but conventions vary widely among programmers.

Difference between interface and abstract class on uml?

In general, the differences are that interface has(1) no fields and(2) no implementation of methodsbut in UML interface may have features (fields), so the difference left is that interface in UML has no implemented methods while abstract class by definition is partially implemented class.

What is the difference between association class and abstract class in software designing?

Association class is describing the relationship between classes. An abstract class is just 1 class, provides some abstraction behaviors that may be (but do not have to) derived, overridden from.

Differentiate Java Abstract Class and Java Interface?

Differences:Abstract class can also contain method definitions but an interface can contain only declarationsAll variables in an interface are by default public static and final whereas in Abstract class it is notAn interface can be considered as a pure abstract class that contains no method implementations and contains only declarations.

What can be declared in an abstract class?

Abstract classes are to be extended until to a concrete class.Can have both abstract & non abstract methods.An Abstract class can not be instantiated.A non abstract class can be extended to an abstract class.If At least one abstract method present in a class then that class must be abstract.abstract & final modifiers can never be together.abstract classes can have both abstract methods & non abstract methods.

Can an abstract class inherit from another abstract class in c plus plus?

Yes an abstract class can inherit from another abstract class but all the methods of the base abstract class must be abstract.

What is the difference between a interface and abstract class?

Some difference between an interface and an abstract class are: a. All variables in an interface are public, static and final but that is not the case in abstract classes b. An abstract class can have both abstract and concrete methods but an interface cannot have concrete methods c. An abstract class can extend other classes and implement interfaces, while an interface can only extend other interfaces.

What is the difference between Virtual Base Class and Abstract Class in c plus plus?

abstract class no defination used by derieved class where virtual base class is defination that can be overriden later on

Is an abstract class virtual by default?

Unlike abstract class in C++, the abstract class in C# does not have any methods defined as virtual by default. The concept of virtual are not the same between C# and C++, either. Any virtual method must be defined explicitly in C#. Related to abstract methods - interestingly, an abstract class in C# does not have to have any abstract methods. However, the reverse, if a class need to have at least one abstract method, that class must be defined as abstract.

How do you declare class as an abstract?

//We Declare an abstract class as-abstract class Car{}//Example of an abstract methodabstract void hondaCity(); //no method body and abstract//Example of Abstract class that has an abstract methodabstract class Car{abstract void run();}class HondaCity extends Car{void run(){System.out.println("runs smartly");}public static void main(String args[]){Car obj = new HondaCity();obj.run();}}//OUTPUT will be-runs smartly

What is difference between Abstract Class and Interface?

All the methods declared inside an Interface are abstract. Where as abstract class must have at least one abstract method and others may be concrete or abstract. In Interface we need not use the keyword abstract for the methods.

Difference between abstract class and interface?

An abstract class can have a combination of abstract methods and normal methods. Interfaces cannot implement any methods themselves, all have to be abstract. Other classes can extend only one class (abstract or not), but can implement as many interfaces as they want.

How do you write concrete method inside abstract class?

There is no difference with method declaration and implementation between abstract and non-abstract classes. You do the exact same thing when writing a concrete method in either an abstract or non-abstract class.

What is an abstract factory class?

An abstract factory class is a class which has an abstract method to create an object.

What is the difference between an Abstract class and Interface?

We can't instantiate both interfaces and abstract classes.The only one difference between them is that an interface can't contain concrete(fully defined) methods where as an abstract class may contain them.An abstract class not necessarily contain abstract methods. we can make a class as abstract class even it does not has any abstract methods.When there is a need to write both abstract and concrete methods in a single unit we have to use an abstract class instead of an interface since an interface cant contain concrete methods.All the fields(or properties) of an interface are by default 'static final' even when you don't mention explicitly. And all methods are 'public abstract'.But in an abstract class we can have any type of fields and methods.

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