classes can be extended and interfaces can be implemented.
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.
An interface can only have abstract methods or constants in it. A class can have both that and everything else in Java.
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.
Its an interface.
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A class is a data type. An interface consists of the private, protected and public members of a class, allowing consumers of the class to interact with the class representation in a controlled manner. The private interface is only accessible to the class itself and to friends of the class. The protected interface is similar to the private interface but is also accessible to derivatives of the class. The public interface is fully accessible. The private and protected interfaces are intended purely for use by the class implementers while the public interface is intended for use by both consumers and implementers.
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.
The implementation detail. Classes may provide a default implementation, interfaces provide only the method signatures
A (concrete) class defines all his methods and can have any kind of instance variable and is declared with the 'class' keyword. Unlike an interface that doesn't implements any of his methods and his variables must be static and final. An interface is defined with the 'interface' keyword.//This is a classpublic class MyClass{public String name;private int age;public void myMethod(){//do something}}//This is a interfaceinterface MyInterface {public static final String name;public static final int age;public void myMethod(); // This method is not implemented}An other difference is that a class can be inheritance by other class but a interface must be implemented using the keyword 'implements'.interface Runnable(){void run();}public class MyOtherClass implements Runnable{public void run(){// insert interesting code here}}
Yes. An interface in essence is a java class and so you can use the term interface class. But, using the term class along with the term interface can cause ambiguity or misunderstandings among novice java developers. So, using the term "Interface" along would suffice to refer to a type of class which is the "Interface"
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