Subinterface for Class Hierarchy Analysis

subinterface.java

public class Main {

  public static void main(String[] args) {
    SuperInterface a = new ImplementerA();
    a.foo();
    SuperInterface b = new ImplementerB();
    b.foo();
  }
}

class ImplementerB implements SubInterfaceB {
  @Override
  public void baz() {

  }

  @Override
  public void foo() {

  }
}

class ImplementerA implements SubInterfaceA {
  @Override
  public void bar() {

  }

  @Override
  public void foo() {

  }
}

interface SubInterfaceA extends SuperInterface {
  void bar();
}

interface SubInterfaceB extends SuperInterface {
  void baz();
}

interface SuperInterface {
  void foo();
}