【原创】纯OO：从设计到编码写一个FlappyBird （四）

import javax.swing.*;
import java.util.LinkedList;
import java.awt.*;
import java.awt.event.*;

public interface Obstacle {
    public void move();
    public LinkedList<Pillar> getObstacles();
}

class SimpleObstacle implements Obstacle {
    private static final int SPEED = 2;
    public LinkedList<Pillar> pillar = new LinkedList<Pillar> ();
    int border;
    
    SimpleObstacle(int border)
    {
        this.border = border;
        init();
    }
    
    private static int getRandomHeight()
    {
        int res = (int)(Math.random() * (Pillar.getHeiLmt() - 100) + 100);
        return res;
    }
    
    private void init()
    {
        pillar.add(new Pillar(this.border,getRandomHeight()));
    }
    
    public LinkedList<Pillar> getObstacles()
    {
        return pillar;
    }
    
    public void move()
    {
        boolean del = false;
        for (Pillar p : pillar)
        {
            p.setX(p.getX() - SPEED);
            if (p.getX() + Pillar.getWidLmt() <= 0)
                del = true;
        }
        if (del)
            pillar.remove();
        Pillar tmp = pillar.getLast();
        if (tmp.getX() + Pillar.getWidLmt() + Pillar.getWidGap() <= border)
            pillar.add(new Pillar(this.border,getRandomHeight()));
    }
}

class Pillar {
    int height;
    int x;
    private static final int WIDGAP = 200;
    private static final int HEIGAP = 150;
    private static final int WIDLMT = 100;
    private static final int HEILMT = 300;
    Pillar(int x,int height)
    {
        this.x = x;
        this.height = height;
    }
    
    public void setX(int x)
    {
        this.x = x;
    }
    
    public int getX()
    {
        return x;
    }
    
    public int getHeight()
    {
        return height;
    }
    
    public static int getWidGap()
    {
        return WIDGAP;
    }
    
    public static int getHeiGap()
    {
        return HEIGAP;
    }
    
    public static int getWidLmt()
    {
        return WIDLMT;
    }
    
    public static int getHeiLmt()
    {
        return HEILMT;
    }
}