main.java

来自「使用java语言实现的elevator模拟程序」· Java 代码 · 共 236 行

package main;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import lifter.Lifter;
import lifter.Request;
import java.awt.*;

import java.awt.*;
import java.awt.event.*;

import javax.swing.*;

public class Main extends JFrame implements ActionListener {//function: main,entry of the program
	private static Container[] container;//容器用于建立图形时用

	private static int row;//行，大楼的高度。

	private static int column;//电梯的数目。

	public static Request receiverequest;//外部发出的请求。

	public static Lifter[] lifters;//生成的电梯，此时没有初始化。

	public static Lifter choosedLifter = null;//选中的电梯，调度的时候用。

	
	public class Request {
		public List<Integer> requestedFloor= (List)new java.util.ArrayList<Integer>(); ;
		public int floorSentRequest;
		public int upordown;
	}
	

	

	public static void main(String[] args) {//入口函数。

		// Promt the user to enter the number of the lift
		String rowString = JOptionPane.showInputDialog(null, "请输入楼层数", "输入",
				JOptionPane.QUESTION_MESSAGE);

		// Promt the user to enter the number of the elevator
		String columnString = JOptionPane.showInputDialog(null, "请输入电梯数", "输入",
				JOptionPane.QUESTION_MESSAGE);

		
		try {
			row = Integer.parseInt(rowString);//从对话框中获得大楼的高度和电梯的数目。
			column = Integer.parseInt(columnString);

			

			container = new Container[column + 2];//用于界面的布局。
			for (int iii = 0; iii <column + 2; iii++) {
				container[iii] = new Container();
			}

			Main m = new Main();//设置界面。
			m.setTitle("欢迎使用电梯系统");
			m.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
			m.setVisible(true);

			container[0] = m.getContentPane();
			container[0].setLayout(new GridLayout(1, column + 1, 5, 5));
			container[1].setLayout(new GridLayout(row, 3, 5, 5));
			container[0].add(container[1]);
			for(int ii = 2; ii < column + 2; ii ++){
				container[ii].setLayout(new GridLayout(1, row, 5, 5));
				container[0].add(container[ii]);
			}
			/*container[2].setLayout(new GridLayout(row, 2, 5, 5));
			container[3].setLayout(new GridLayout(1, column, 5, 5));
			container[0].add(container[1]);
			container[0].add(container[2]);
			container[0].add(container[3]);*/

			// Set GirdLayout,gaps 5 between compontent horizontally and vertically

			// Add buttons to frame

			for (int i = row; i >= 1; i--) {//增加外部请求的按钮。	
				JLabel b = new JLabel("        " + i);
				container[1].add(b);
				
				//JButton a = new JButton("up " + i);
				//JButton a = new JButton("∧");
				JButton a = new JButton("up " + i);
				a.addActionListener(m);//每个按钮的listener为m
				container[1].add(a);

				//JButton aa = new JButton("down " + i);//增加外部请求的按钮。
				//JButton aa = new JButton("∨");
				JButton aa = new JButton("down " + i);
				aa.addActionListener(m);
				container[1].add(aa);
			}

			lifters = new Lifter[column];//电梯的初始化。电梯的绘制也在这里进行。
			for (int ii = 0; ii < column; ii++) {
				lifters[ii] = new Lifter(row, 0, 0, container[ii + 2]);
			}

			for (int i = 0; i < lifters.length; i++) {
				new Thread(lifters[i]).start();//让新绘制的电梯启动
			}
		} catch (NumberFormatException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

	}

	public synchronized void actionPerformed(ActionEvent e) {//外部请求得主响应函数。

		String estr = e.getActionCommand();
		if (estr.charAt(0) == 'u' ||estr.charAt(0) == 'd') {
			//if (estr.equals("up") == true ||estr.equals("down") == true) {
			receiverequest = new Request();
			receiverequest.floorSentRequest = Integer.parseInt(estr
					.substring(estr.indexOf(" ") + 1));
			if (estr.charAt(0) == 'u')
				//if (estr.equals("up") == true)
				receiverequest.upordown = 1;
			if (estr.charAt(0) == 'd')
				//if (estr.equals("down") == true)	
			    receiverequest.upordown = -1;

			choosedLifter = chooseLifter(lifters, receiverequest);// 从电梯中选者一部电梯,如果没有符合条件的电梯就返回空.

			if (choosedLifter != null) { // 如果返回为空,即当前没有电梯符合条件,当前请求就被忽视
				choosedLifter.printDest();//输出destFloors的状态。
				if ((receiverequest.upordown == 1&&choosedLifter.currentFloor<receiverequest.floorSentRequest)||(receiverequest.upordown==-1&&choosedLifter.currentFloor<receiverequest.floorSentRequest)) {
					choosedLifter.addDestUp(new Integer(
							receiverequest.floorSentRequest));// 往选中的电梯目标队列当中添加receiverequest.floorsentrequest
					choosedLifter.moveState=1;
				}else if((receiverequest.upordown==-1&&choosedLifter.currentFloor>receiverequest.floorSentRequest)||(receiverequest.upordown == 1&&choosedLifter.currentFloor>receiverequest.floorSentRequest)){
					choosedLifter.addDestDown(new Integer(receiverequest.floorSentRequest));
					choosedLifter.moveState=-1;
				}
				choosedLifter.printDest();
				if (choosedLifter.flag == 1) { // 如果当前电梯可以开启的话就开启，不能开启意味着此电梯已经开启。对已经开启的电梯只需要让他跑完就可以了。
					// flag为０的情况是：电梯已经开启，下一个请求还是选中了这部电梯，
					new Thread(choosedLifter).start();

					choosedLifter.flag = 0; // 当电梯队列里的成员都被跑完后，flag会改为１
				}
			}
			// System.out.println("5");
			receiverequest = null;
		}

	}

	public static synchronized Lifter chooseLifter(Lifter[] l,
			Request receiverequest) {// 选者电梯
		Lifter choosedLifter = null;
		int temp, temp2;

		if (receiverequest != null) {
			if (receiverequest.upordown == 1) {//向上的话就从该楼层以下的电梯里选者同向的电梯。
				try {
					temp = Math.abs(receiverequest.floorSentRequest
							- l[0].currentFloor);
					for (int i = 0; i < l.length; i++) {
						if (l[i].currentFloor <= receiverequest.floorSentRequest
								&& l[i].moveState == receiverequest.upordown) {
							if (temp >= Math
									.abs(receiverequest.floorSentRequest
											- l[i].currentFloor)) {
								choosedLifter = l[i];
								temp = Math.abs(receiverequest.floorSentRequest
										- l[i].currentFloor);
							}
						}
					}
				} catch (Exception e) {
				} finally {
					if (choosedLifter == null) {//如果没有找到合适的就从静止的电梯中找离它最近的，再没有找到的话就忽视该请求
						temp2 = Math.abs(receiverequest.floorSentRequest
								- l[0].currentFloor);
						for (int j = 0; j < l.length; j++) {
							if (l[j].moveState == 0) {
								if (temp2 >= Math
										.abs(receiverequest.floorSentRequest
												- l[j].currentFloor)) {
									choosedLifter = l[j];
									temp2 = Math
											.abs(receiverequest.floorSentRequest
													- l[j].currentFloor);
								}
							}
						}
					}
				}
			}
			if (receiverequest.upordown == -1) {//向下的话就从该楼层以上的电梯里选者同向的电梯。
				try {
					temp = Math.abs(l[0].currentFloor
							- receiverequest.floorSentRequest);
					for (int i = 0; i < l.length; i++) {
						if (l[i].currentFloor >= receiverequest.floorSentRequest
								&& l[i].moveState == receiverequest.upordown) {
							if (temp >= l[i].currentFloor
									- receiverequest.floorSentRequest) {
								choosedLifter = l[i];
								temp = l[i].currentFloor
										- receiverequest.floorSentRequest;
							}
						}
					}
				} catch (Exception e) {
				} finally {
					if (choosedLifter == null) {//如果没有找到合适的就从静止的电梯中找离它最近的。
						temp2 = Math.abs(receiverequest.floorSentRequest
								- l[0].currentFloor);
						for (int j = 0; j < l.length; j++) {
							if (l[j].moveState == 0) {
								if (temp2 >= receiverequest.floorSentRequest
										- l[j].currentFloor) {
									choosedLifter = l[j];
									temp2 = receiverequest.floorSentRequest
											- l[j].currentFloor;
								}
							}
						}
					}
				}
			}
		}
		return choosedLifter;//返回选中的电梯。
	}
}