![]() ![]() However its a valid interface which has non-static methods as well and can be implemented. For example, interface has a bunch of static methods which could be located in some Streams or StreamUtils class prior to Java 8. Interface can only be implemented using implements keyword.Ī class can have any type of members like private, public.Įxample of Class vs Interface JavaTester. You should use interface only if you expect that somebody would implement it. Interface is declared using interface keyword.Ī class can inherit another class using extends keyword and implement an interface.Ī class can be inherited using extends keyword. Interface can not implement an interface, it can extend an interface. Only static and final variables are permitted. Java 8 onwards, it can have default as well as static methods.įinal, non-final, static and non-static variables supported. Interface can have only abstract methods. ![]() No.Ī class can have both an abstract as well as concrete methods. And an interface contains behaviors that a class implements.įollowing are the important differences between Class and an Interface. But a class describes the attributes and behaviors of an object. An interface is different from abstract classes, i.e., an interface cant be instantiated, just like the abstract class. Writing an interface is similar to writing a class. Method bodies exist only for default methods and static methods. A class implements an interface, thereby inheriting the abstract methods of the interface.Īlong with abstract methods, an interface may also contain constants, default methods, static methods, and nested types. Second is that methods in an interface are only declared but not. The first major difference is that a class can be instantiated, but an interface can never be instantiated. Instance variables can be accessed from inside any method, constructor or blocks of that particular class.Ĭlass variables − Class variables are variables declared within a class, outside any method, with the static keyword.Īn interface is a reference type in Java. In fact, an interface is declared using syntax very similar to that of a class definition, but there is also a major difference between class and interface in Java. These variables are initialized when the class is instantiated. Instance variables − Instance variables are variables within a class but outside any method. The variable will be declared and initialized within the method and the variable will be destroyed when the method has completed. Local variables − Variables defined inside methods, constructors or blocks are called local variables. A class can contain any of the following variable types. Note : Concrete methods are those methods which has their complete. From Java 9, it can have private concrete methods as well. From Java 8, it can have default and static methods also. Whereas, an abstract class can have abstract method and concrete methods. A class is a blueprint from which individual objects are created. Type of methods: Interface can have only abstract methods. ![]()
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