interface-injection.java

interface InjectWheels {
 public void setWheels(Wheels w);
}

interface InjectBattery {
 public void setBattery(Battery b);
}

class Car implements InjectWheels, InjectBattery {
 Wheels injectedWheels; 
 Battery injectedBattery;

 public void setWheels(Wheels w) {
   this.injectedWheels = w;
 }
 
 public void setBattery(Battery b) {
   this.injectedBattery = b;
 }
}