class InterClass {

  int x = 4;

}

interface MyInterface {

  public static final InterClass inter = new InterClass();
}

public class Test implements MyInterface {

  public static void main(String[] args) {
    Test t1 = new Test();
    t1.inter.x = 9;
    Test t2 = new Test();
    t2.inter.x = 7;
    System.out.println(t1.inter.x); //7

  }
}