Difference between class and interface in java?

Answer 1

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.

Answer 2

This que. is already answered as:

1. A class can have methods that have code in them whereas an interface can

have only method declarations 2. Classes can be extended while Interfaces have to be implemented 3. All variables declared inside an interface are public and static by default

while it is not the case in classes.

Answer 3

Some differences are:

1. A class can have methods that have code in them whereas an interface can have only method declarations
2. Classes can be extended while Interfaces have to be implemented
3. All variables declared inside an interface are public and static by default while it is not the case in classes.

Answer 4

Both Class and Interface are basic constructs in Java which are part of every java based application. A class is a concrete definition which contains proper definitions for every functionality the class is expected to perform. Whereas, an interface is a skeleton which outlines the functions which it is expected to perform and leaves the implementation part to the class that is implementing this interface.

Answer 5

Class in Java programming is composed of instantiated objects that have its own state and behavior. An interface cannot be instantiated nor created as object.

Answer 6

One major difference is that an interface can have the method names (or, more precisely, their signatures), but not the actual method code.