Interface

Interface

It is the Collection of public, abstract Methods. (It consists by default)

An interface program can have any number of implements

Example of Interface

package Test;

import java.util.Scanner;

interface Caluclator

{
void mul();
void div();
}


class MyCalculator implements Caluclator
{
public void mul()
{
int a=10;
int b=20;
int c= a*b;
System.out.println(c);
}

public void div()
{
int a=10;
int b=20;
int c= a/b;
System.out.println(c);
}

}

class MyCalculator1 implements Caluclator
{
public void mul()
{
Scanner scan= new Scanner(System.in);

System.out.println("Enter the Value of a");
int a= scan.nextInt();

System.out.println("Enter the Value of b");
int b= scan.nextInt();


int c= a*b;
System.out.println(c);
}

public void div()
{
Scanner Scan= new Scanner(System.in);

System.out.println("Enter the Value of a");
int a=Scan.nextInt();

System.out.println("Enter the Value of b");

int b=Scan.nextInt();
int c= a/b;
System.out.println(c);
}

}
class MyCalculator2 implements Caluclator
{

public void mul()
{
Scanner Scan= new Scanner(System.in);

System.out.println("Enter the Value of a");
int a=Scan.nextInt();
System.out.println("Enter the Value of b");
int b=Scan.nextInt();

if(a==0 || b==0)
{
System.out.println("invalidInput");
}
else
{
int c =a*b;
System.out.println(c);
}
}
public void div()
{
Scanner Scan= new Scanner(System.in);
System.out.println("Enter the Value of a");
int a=Scan.nextInt();
System.out.println("Enter the Value of b");
int b=Scan.nextInt();
if(a==0 || b==0)
{
System.out.println("invalid Input");
}
else
{
int c=a/b;
System.out.println(c);
}
}
}

class Test{
public static void main(String []args)
{
MyCalculator mc1=new  MyCalculator();
MyCalculator1 mc2=new MyCalculator1();
MyCalculator2 mc3=new MyCalculator2();

Math m= new Math();
m.permit(mc1);
m.permit(mc2);
m.permit(mc3);


}

}

class Math{
void permit(Caluclator ref)
{
ref.mul();
ref.div();

}
}