Java如何将父类变量的值传递给继承对象

Question

我正在进行空中交通塔运动。我有一个飞机类与两个变量id和idCounter。该班级由3个其他班级继承 - 3种类型的飞机。 我使用工厂设计模式从这三种类型中的每一种创建对象，创建时对象保存在ArrayList中。每个对象应该有一个唯一的ID，我应该使用idCounter来确定它。

我写了下面的方法

public long nextId() { 
    setIdCounter(getIdCounter()+1); 
    return idCounter; 
} 

public void setId(long id) { 
    Id = nextId(); 
} 

的问题是，我似乎无法更新对象的ID，所有ID都停留在0

我已经打过电话设置方法与

arrayName.get(i).setId(); 

，但它不能看到它，并要求我创建由继承类实现的接口一个setId()方法。

我也试着这样做

public long nextId() { 
    setId(getIdCounter()+1); 
    return id; 
} 

与

arrayName.get(i).nextId(); 

调用它，但它不会工作，因为nextId也不是一成不变的，如果我让静态的我有使id也是静态的。

我该如何调用这个main或者告诉我的对象更新他们的id？

飞机类代码

public class Aircraft { 

    protected long Id; 
    protected String name; 
    protected Coordinates coordinates; 
    private long idCounter; 

    public long getId() { 
     return Id; 
    } 
    public void setId(long id) { 
     Id = id; 
    } 
    public String getName() { 
     return name; 
    } 
    public void setName(String name) { 
     this.name = name; 
    } 
    public Coordinates getCoordinates() { 
     return coordinates; 
    } 
    public void setCoordinates(Coordinates coordinates) { 
     this.coordinates = coordinates; 
    } 
    public long getIdCounter() { 
     return idCounter; 
    } 
    public void setIdCounter(long idCounter) { 
     this.idCounter = idCounter; 
    } 
    public Aircraft(String name, Coordinates coordinates) { 

     this.name = name; 
     this.coordinates = coordinates; 
    } 

    public long nextId() { 
     setIdCounter(getIdCounter()+1); 
     return idCounter; 
    } 
} 

工厂类

public class ConcreteAircraftFactory extends AircraftFactory { 

    public Flyable newAircraft (String type, String name, int longitude, int latitude, int height){ 

     Coordinates coord = Coordinates.makeCoordinate(longitude, latitude, height); 

     if (type.equals("Baloon") || type.equals("baloon")) { 
      return new Baloon(name, coord); 
     } 

     else if(type.equals("JetPlane") || type.equals("jetplane") || type.equals("Jetplane")) { 
      return new JetPlane(name, coord); 
     } 

     else if(type.equals("Helicopter") || type.equals("helicopter")) { 
      return new Helicopter(name, coord); 
     } 
     else 
      return null; 
    } 
} 

主要

ArrayList<Flyable> ar = new ArrayList<Flyable>(); 

for (int i = 1; i <FileReader.fileList.size(); i++) { 
    ar.add(factory.newAircraft(FileReader.fileList.get(i)[0], FileReader.fileList.get(i)[1], Integer.parseInt(FileReader.fileList.get(i)[2]), 
      Integer.parseInt(FileReader.fileList.get(i)[3]), Integer.parseInt(FileReader.fileList.get(i)[4]))); 
} 

其中一个继承类（都具有相同的实现）

public class JetPlane extends Aircraft implements Flyable{ 

private WeatherTower weatherTower; 
private String text; 

public JetPlane(String name, Coordinates coordinates) { 
    super(name, coordinates); 

} 


public void updateConditions() { 
    weatherTower= new WeatherTower(); 
    String newWeather = weatherTower.getWeather(coordinates); 

    switch(newWeather) { 

    case WeatherType.FOG: 
     coordinates.setLatitude(coordinates.getLatitude()+1); 
     text ="JetPlane #" + this.getName() + "(" + this.getId() + "): it's really foggy down there"; 
     try(PrintWriter out = new PrintWriter(new FileOutputStream("Simulation.txt", true))){ 
      out.println(text); 
     } catch (FileNotFoundException e) { 
      e.printStackTrace(); 
     } 
    break; 

    case WeatherType.RAIN: 
     coordinates.setLatitude(coordinates.getLatitude()+5); 
     text ="JetFighter #" + this.getName() + "(" + this.getId() + "): it's raining hard here"; 
     try(PrintWriter out = new PrintWriter(new FileOutputStream("Simulation.txt", true))){ 
      out.println(text); 
     } catch (FileNotFoundException e) { 
      e.printStackTrace(); 
     } 
    break; 

    case WeatherType.SUN: 
     coordinates.setHeight(coordinates.getHeight()+2); 
     coordinates.setLatitude(coordinates.getLatitude()+10); 
     text ="JetFighter #" + this.getName() + "(" + this.getId() + "): flying in the sun is so much fun"; 
     try(PrintWriter out = new PrintWriter(new FileOutputStream("Simulation.txt", true))){ 
      out.println(text); 
     } catch (FileNotFoundException e) { 
      e.printStackTrace(); 
     } 
    break; 

    case WeatherType.SNOW: 
     coordinates.setHeight(coordinates.getHeight()-7); 
     text ="JetFighter #" + this.getName() + "(" + this.getId() + "): that thing about winter that guy from that tv show once said"; 
     try(PrintWriter out = new PrintWriter(new FileOutputStream("Simulation.txt", true))){ 
      out.println(text); 
     } catch (FileNotFoundException e) { 
      e.printStackTrace(); 
     } 
    break; 
    } 

    if(coordinates.getHeight()<0) { 
     coordinates.setHeight(0); 
    } 
    if(coordinates.getHeight()>100) { 
     coordinates.setHeight(100); 
    } 
    if (coordinates.getHeight()==0) { 
     weatherTower.unregister(this); //de vazut 
     text ="Tower says: JetPlane #" + this.getName() + "(" + this.getId() + "): has been unrergistered"; 
     try(PrintWriter out = new PrintWriter(new FileOutputStream("Simulation.txt", true))){ 
      out.println(text); 
     } catch (FileNotFoundException e) { 
      e.printStackTrace(); 
     } 
    } 

} 

public void registerTower(WeatherTower weatherTower) { 
    weatherTower.register(this); 
    text ="Tower says: JetPlane #" + this.getName() + "(" + this.getId() + "): has been rergistered"; 
    try(PrintWriter out = new PrintWriter(new FileOutputStream("Simulation.txt", true))){ 
     out.println(text); 
    } catch (FileNotFoundException e) { 
     e.printStackTrace(); 
    } 
    } 

}

Answer 1

我可能会更有益的，如果我可以看到代码，但我认为，如果你做这个“idCounter”静态变量它会工作。

static long idCounter;