Interface implementation issue

[vineet walia]

interface f1
	{
		int i=15;
	
	}
interface f2
	{
		int i =5;
	}

public class inter implements f1,f2 {

	public static void main(String str [])
	{
		System.out.println("testing"+i);// i have to print f1 i variable 
		
	}
	
}

i have to print f1 interface variable

[Ninad Kulkarni]

interface f1
	{
		int i=15;

	}
interface f2
	{
		int i =5;
	}

public class inter implements f1,f2 {

	public static void main(String str [])
	{
		System.out.println("testing"+f1.i);// i have to print f1 i variable

	}

}

Your code will not compile because reference to i is ambiguous, both variable i in f1 and variable i in f2 match
so you have to use f1.i

[vineet walia]

thanks a lot

[Rohini Shirpewar]

This should work.

     public static void main(String str [])  
     {  
    	 f1 testF = new inter();
         System.out.println("testing"+ testF.i);// i have to print f1 i variable   
           
     } 

[Hareendra Reddy]

Hi all,

variables declared inside a interface are implicitly public ,static and final,
So, we can refer to the desired variable by using qualified name with interface type..

Can some one explain how to access the super class instance variable of same name....

class f3
{
     int i =3;
}
class f4 extends f3 {
     int i=4;
}
public class Testing extends f3{
	public static void main(String str [])
	{
		System.out.println("testing"+(new f4()).i);// prints 4
	}	
}

Hoe to access the f3 version of variable i ??

[Ninad Kulkarni]

@Hareendra
You can start new thread and ask question about super class and sub class issue because subject line of thread is interface implementation issue.

[James Elsey]

would the i not be overridden if one interface extends another?

[Ninad Kulkarni]

Overriding happens with instance method
See OverridingVsHiding

[Salil Vverma]

Hi Hareendra,

You can access the value of i of f3 as mentioned below -

class f3
{
     int i =3;
}
class f4 extends f3 {
     int i=4;
}
public class inter extends f3{
	public static void main(String str [])
	{
		System.out.println("testing"+ ((f3)(new f4())).i);// prints 3
	}	
}

[Hareendra Reddy]

Thank you Salil...

[Eric Kizaki]

Also:

class f3  
{  
     int i =3;  
}  
class f4 extends f3 {  
     int i=4;  
}  
public class inter extends f3{  
    public static void main(String str [])  
    {  
        System.out.println("testing"+ new inter().i);  //testing 3
	//or
	System.out.println("testing"+ new f3().i);  //testing 3

	//inter is not a f4 they are peers (both subclasses of f3)
    }     
}