Interface in Java

Interfaces in java

1) create an interface

package com.training.slc;

public interface Mama {
	 String NAME ="VENU";
	 
	 
	 void addNumber();
	 
	 int AddNumber();

}

2) Create a class which implements interface
package com.training.slc;

public class MamaImpl1 implements Mama {
	
	int n1 =10;;
	int n2 = 100;
	public static void main(String [] args )
	{
		System.out.println( Mama.NAME );// this line nnned not be since Name is also a member of MamaImpl
		System.out.println( NAME );
	}

@Override
	public int AddNumber() {
		// TODO Auto-generated method stub
		return n1+n2+100;
	}

@Override
	public void addNumber() {
		// TODO Auto-generated method stub
		
		System.out.println(n1+" \n  " + n2);
		
	}

}

3) create another class which implements interface

package com.training.slc;

public class MamaImpl2 implements Mama {

int a1=10;
	@Override
	public int AddNumber() {
		// TODO Auto-generated method stub
		
		
		return a1+10;
	}

@Override
	public void addNumber() {
		// TODO Auto-generated method stub

System.out.println(a1);
	}

}

4) how to use them?

package com.training.slc;

public class SomeClass {
	
	
	public static void main(String [] args)
	{
		//Mama m = new Mama();  this doesnt work since interface instantiate
		
		Mama m1 = new MamaImpl1();
		
		Mama m2 = new MamaImpl2();
		
		
		System.out.println( "THIS IS M1 interface:"+ m1.AddNumber());
		System.out.println( "THIS IS M2 interface: "+ m2.AddNumber());
	}

}

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