directiongroup.java

交通灯路口的一个小程序,控制四个灯,其中南灯有一个外加左转灯

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;
/**
 * DirectionGroup class keeps all traffic lights in a direction
 *
 * @author Hao Chen
 * @version 1.0
 */
public class DirectionGroup {


        public int lightDirection;
        TrafficLight[] TrafficLightHolder;
        LinkedList lights;


 /**
   * constructor of direction group, create a directiongroup include all lights
   *  @param lightDirection: the direction of the light set
   */

	public	DirectionGroup ( int lightDirection )
	{
	    this.lightDirection = lightDirection;
	    lights = new LinkedList();


	}

  /**
   * Adds a lightto the list of light set made so far.
   *
   * @param light - the current light made by the user.
   */
	public void AddLight (TrafficLight light )
	{
	     lights.add(light);

	}
  /**
   * get this direction
   *
   * @param direction - the current direction
   */
	public int GetDirection ()
	{
	     return lightDirection;
	}
  /**
   * get the last light type in the light set
   *
   * @param light - the current light made by the user.
   */
	public TrafficLight GetLastLight ()
	{


	     return (TrafficLight)lights.getLast();
	}
  /**
   * get the first light type in the light set
   *
   * @param light - the current light made by the user.
   */
	public TrafficLight GetFirstLight ()
	{


		     return (TrafficLight)lights.getFirst();
	}
  /**
   * remove the first light type in the light set
   *
   * @param light - the current light made by the user.
   */
		public TrafficLight removeFirst ()
		{

	return (TrafficLight)lights.removeFirst();

	}
	  /**
	   * get the  light type in the light set with index
	   *
	   * @param light - the current light made by the user.
   */
		public TrafficLight GetLight (int x)
		{

		  ;
		     return (TrafficLight)lights.get(x);
		}



}