gistfile1.java

abstract class Bicycle {
  
  abstract public void changeGear(int newValue);

  abstract public void speedUp(int increment);

  public void applyBrakes(int decrement) {
    // do some work here
  }
  
}

public class ACMEBicycle extends Bicycle {
   
   public void applyBrakes(int decrement) {
     // do some work here
   }

}