inner class inside interface

How to write the inner class inside the interface?

public interface MyInterface {

class  InsideInter{
int i=9, j=10;
public int add(int i,int j){
int tot=0;
tot=i+j;
return tot;
}
}
}
public class TestInterface implements MyInterface {

/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
        TestInterface ti=new TestInterface();
       MyInterface.InsideInter insider=new MyInterface.InsideInter();
       System.out.println(insider.add(20, 25));
     
}

}

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