Difference Between Class vs. Interface in Java

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Main Difference

The difference between class and interface in Java is that class in java is instantiated to create object whereas interface in java can never be instantiated as the method are unable to perform any action on invoking.

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Class vs. Interface in Java

Java is an object-oriented programming language that uses both compiler and interpreter. Mostly all software’s are made in Java programming language. Java code can be written on Windows, Linux, and Mac OS. The syntax of C and C++ programming language is quite the same. Java produces browser to run programs that help in making a graphical user interface. Java programming language is in used and trend these days. To write Java code, a programmer needs software development kit (SDK) that includes a compiler, interpreter that is not required in C++. Class in java is instantiated to create object whereas interface in java can never be instantiated as the method are unable to perform any action on invoking. The class is one of the most important features in Java programming. We cannot implement a java implement in java programming if we don’t know about to implement the class. Classes in java programming are also used to create objects because class creates reference type. In the signature of a class, there is a body of class that is the class’s name and all the information. In the main body of the class, there is fields and methods of the class. The objects in class can be static and non-static. The keyword class is used for making a class in java programming. Each object created in java contain and copy field and methods. Access specifier decides the visibility and accessibility of the members of the subclass. Inheritance can be done by using access specifier in Java programming. One class inherit the objects and methods of the other class. A class can only inherit a single class; interface was created to solve this problem. Using interface class can inherit more than one class. The structure of the interface is very similar to a class. The keyword that is used to implement the interface in java is an interface.In the interface, method is not defined inside the body of the interface. Class must be defined inside the body of the interface. The method of the class must always be public.

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Comparison Chart

ClassInterface
Class in java is instantiated to create an objectThe interface in java can never be instantiated as the method are unable to perform any action on invoking.
Keyword
Keyword class is used to implement a class in java.Keyword interface is used to implement the interface in java.
Constructor
A class can have a constructor.An interface can never have a constructor.
Method
Methods in class are defined to perform a specific function.The method in the interface is purely abstract.

What is Class in Java?

The class is one of the most important features in Java programming. We cannot implement a java implement in java programming if we don’t know about to implement the class. Classes in java programming are also used to create objects because class creates reference type. In the signature of a class, there is a body of class that is the class’s name and all the information. In the main body of the class, there is fields and methods of the class. The objects in class can be static and non-static. The keyword class is used for making a class in java programming. Each object created in java contain and copy field and methods. Access specifier decides the visibility and accessibility of the members of the subclass. Inheritance can be done by using access specifier in Java programming. One class inherit the objects and methods of the other class.

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What is Interface in Java?

A class can only inherit a single class; interface was created to solve this problem. Using interface class can inherit more than one class. The structure of the interface is very similar to a class. The keyword that is used to implement the interface in java is an interface.In the interface, a method is not defined inside the body of the interface. The class must be defined inside the body of the interface. The method of the class must always be public.

Key Differences

  1. Class in java is instantiated to create object whereas Interface in java can never be instantiated as the method are unable to perform any action on invoking.
  2. Keyword class is used to implement a class in java whereas keyword interface is used to implement the interface in java.
  3. A class can have constructor whereas an interface can never have a constructor.
  4. Methods in class are defined to perform specific function whereas the method in the interface is purely abstract.

Comparison Video