difference between abstract class and interface | java interview questions | wikitechy.com

Abstract class can have static methods.Interface cannot have static methods.Abstract class can have constructor.Interface cannot have constructor.

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[saranrajs]

As one of the similarities to Abstract class, it is a contract that is used to define hierarchies for all subclasses or it defines specific set of methods and their arguments. The main difference between them is that a class can implement more than one interface but can only inherit from one abstract class.

[vigneshjollyman]

All variables in an Interface are by default – public static final while an abstract class can have instance variables. 5. An interface is also used in situations when a class needs to extend an other class apart from the abstract class. In such situations its not possible to have multiple inheritance of classes.

[priyankamurali]

Abstract classes are classes that contain one or more abstract methods. An abstract method is a method that is declared, but contains no implementation. Abstract classes may not be instantiated, and require subclasses to provide implementations for the abstract methods.

[geethachinnapaiyan]

abstract Classes: Interfaces: 1
abstract class can extend only one class or
one abstract class at a time interface can
extend any number of interfaces at a time

[monishamoni.]

However, a class can implement multiple interfaces – which could be considered as an alternative to for multiple inheritance. So, one major difference is that a Java class can inherit from only one abstract class, but can implement multiple interfaces.

[nithinyashwanth]

Abstract class and interface both are used to achieve abstraction where we can declare the abstract methods. Abstract class and interface both can't be instantiated.

[lavanyaumapathy]

Main difference is methods of a Java interface are implicitly abstract and cannot have implementations. A Java abstract class can have instance methods that implements a default behavior. 2.Variables declared in a Java interface is by default final. An abstract class may contain non-final variables.

[aswinchandarj]

which could be considered as an alternative to for multiple inheritance.
So, one major difference is that a Java class can inherit from only one
abstract class, but can implement multiple interfaces.

[saranrajs]

I have already covered basics of Abstract class and Interface while discussing OOPs concepts and in following posts: ... In this post we will discuss difference between Abstract Class and Interface in Java with examples. ... abstract class can extend only one class or one abstract class at ...

[music-patiencealwayspaysof]

Difference between Abstract Class and Interface. An abstract class cannot support multiple inheritance, but an interface can support multiple inheritance. Thus a class may inherit several interfaces but only one abstract class. ... An Abstract class is a class which will contains both definition and implementation in it.

[monishamoni.]

Methods of a Java interface are implicitly abstract and cannot have implementations. A Java abstract class can have instance methods that implements a default behaviour. Variables declared in a Java interface are by default final. ... A Java class can implement multiple interfaces but it can extend only one abstract class.

[nithinyashwanth]

Abstract class can have final, non-final, static and non-static variables.
Interface has only static and final variables.

[ilakkiyameenu]

Abstract class can have static methods.Interface cannot have static methods.Abstract class can have constructor.Interface cannot have constructor.

[samuelsam]

Abstract class doesn't support multiple inheritance. 3) Abstract class can have final, non-final, static and non-static variables. 4) Abstract class can have static methods, main method and constructor. Interface can't have static methods, main method or constructor.

[saranrajs]

Methods of a Java interface are implicitly abstract and cannot have implementations. A Java abstract class can have instance methods that implements a default behaviour. Variables declared in a Java interface are by default final. An abstract class may contain non-final variables.Sep 13, 2013

[deenasteyn]

1.Main difference is methods of a Java interface are implicitly abstractand cannot have implementations. A Java abstract class can have instance methods that implements a default behavior. 2.Variables declared in a Java interface is by default final. Anabstract class may contain non-final variables.

[samuelsam]

Interface or Abstract Class. Java doesn't support multiple class level inheritance, so every class can extend only one superclass. If there are a lot of methods in the contract, then abstract class is more useful because we can provide default implementation for some of the methods that are common for all the ...

[snehamani]

1.Main difference is methods of aJava interface are implicitly abstractand cannot have implementations. AJava abstract class can have instance methods that implements a default behavior. 2.Variables declared in aJava interface is by default final. Anabstract class may contain non-final variables.

[rebanbabu]

.Main difference is methods of a Javainterface are implicitly abstract and cannot have implementations. A Java abstract classcan have instance methods that implements a default behavior. 2.Variables declared in a Java interface is by default final. An abstract class may contain non-final variables.

[hemamalinig]

1) Abstract class can have abstract and non-abstractmethods.Interface can have only abstract methods.

2) Abstract class doesn't support multiple inheritance.Interface supports multiple inheritance.

3) Abstract class can have final, non-final, static and non-static variables.Interface has only static and final variables.

4) Abstract class can have static methods, main method and constructor.Interface can't have static methods, main method or constructor.

5) Abstract class can provide the implementation of interface.Interface can't provide the implementation of abstract class.

6) The abstract keyword is used to declare abstract class.The interface keyword is used to declare interface.

7) Example for abstract class:
public abstract class Shape{
public abstract void draw();
}
Example for interface class:
public interface Drawable{
void draw();
}