listing28.7.java

java 完全探索的随书源码

class Car {
  TireSpecification tires;
  boolean running;
  public Car (TireSpecification tires){
    this.tires = tires;
   }
}

class BMW_540i extends Car {
  public BMW_540i(TireSpecification tires) {
    super(tires);
  }

  public boolean start() {
    running = true;
    System.out.println("The 540i is now running");
    return true;
  }
}

class Volvo_V70 extends Car {
  public Volvo_V70(TireSpecification tires) {
    super(tires);
  }

  public boolean start() {
    running = true;
    System.out.println("The V70 is now running");
    return true;
  }
}