what is interface in java ?can you explain with simple example?and what is the

what is interface in java ?can you explain with simple
example?and what is the difference between abstract and
interface?

Question Posted / manasa

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what is interface in java ?can you explain with simple example?and what is the difference between a..

Answer / Bholendra Pratap Pandey

In Java, an Interface is a collection of abstract methods (methods without a body) and constant variables (variables whose values cannot be changed). It defines a set of rules that a class implementing the interface must follow. Here's an example of an interface:

```java
interface Shape {
double PI = 3.14;
void draw();
}
```

A class can implement an interface by providing a concrete implementation for its abstract methods:

```java
class Circle implements Shape {
private double radius;

public Circle(double radius) {
this.radius = radius;
}

public void draw() {
// draw code for circle goes here
}
}
```

An Abstract class, on the other hand, can contain both abstract and concrete methods. It provides a partial implementation of the rules and leaves some parts to be implemented by the subclass:

```java
abstract class Animal {
private String name;

public Animal(String name) {
this.name = name;
}

public abstract void makeSound();

public void introduce() {
System.out.println("My name is " + name);
}
}
```

In summary, an interface declares a contract that the implementing class must adhere to (methods and constants), while an abstract class can have both concrete and abstract methods to provide a base structure for its subclasses.

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