isp_java_interface_example.java

class WallPoweredDevice {
  public void plugInPower() {
  }
}

interface InternetDevice {
  public void connectToDeviceViaEthernetCord(InternetDevice device);
}

class Router extends WallPoweredDevice implements InternetDevice {
  public void connectToDeviceViaEthernetCord(InternetDevice device) {
  }
}

class Main {
  public static void main(String[] args) {
    Router linksys = new Router();
    Television tv = new Television();
    linksys.connectToDeviceViaEthernetCord(tv);
  }
}