java中怎么利用多线程模拟交通信号灯
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light类：
package traffic;
public class light {
int x,y; //灯在画布上的位置
boolean status; //灯的状态
public light(int x,int y,boolean islight) {
this.x=x;
this.y=y;
this.status=islight;
}
public void setlight(boolean sta) { //对外接口更改灯的状态
this.status=sta;
}
}lamp类：
package traffic;
public class lamp implements Runnable {
light opposite, now; //相互匹配的两个灯
int greentime; //绿灯亮的时间
int name; //编组
boolean status; //状态
static Object lock = new Object();
public lamp(light l0, light l2,int gt, boolean st, int name) {
now = l0;
opposite = l2;
status = st;
greentime = gt;
this.name = name;
lightstatues();
}
public void change() {
this.status = !(this.status);
lightstatues();
}
public void setgreentime(int time) {
this.greentime=time;
}
public int getgreentime() {
return this.greentime;
}
public void lightstatues() {
opposite.setlight(status);
now.setlight(status);
}
public void run() {
while (true) {
synchronized (lock) { //使用synchronized实现进程间的互斥
if (name == mainclass.panel.islight) { //使用辅助变量实现进程按顺序循环
//System.out.println("now is: "+name);
change();
mainclass.panel.repaint();
try {
Thread.sleep(greentime);
} catch (InterruptedException e) {
e.printStackTrace();
}
lock.notifyAll(); //唤醒其他进程
change();
mainclass.panel.LampChange();
mainclass.panel.repaint();
try {
lock.wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
} else {
try {
lock.wait(); //挂起进程
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
}
}Mypanel类：
package traffic;
import java.awt.Color;
import java.awt.Graphics;
import java.util.ArrayList;
import java.util.Random;
import javax.swing.JPanel;
public class Mypanel extends JPanel {
light l0,l2,l3,l4,l5,l6,l7,l8,l9,l10,l11,l12; //十二个灯
lamp lamp1,lamp2,lamp3,lamp4; //四组信号灯
static int islight; //实现进程循环的辅助变量
Random r=new Random();
static public ArrayList lightlist= new ArrayList(); //使用list方便遍历每个灯
static public ArrayList carlist= new ArrayList(); //方便遍历每个车
public Mypanel() {
// TODO Auto-generated constructor stub
l0=addlist(l0, 212, 316, false);
l2=addlist(l2, 242, 316, false);
l3=addlist(l3, 272, 316, true);
l4=addlist(l4, 316, 116, true);
l5=addlist(l5, 316, 146, false);
l6=addlist(l6, 316, 176, false);
l7=addlist(l7,116 , 70, true);
l8=addlist(l8, 146, 70, false);
l9=addlist(l9, 176, 70, false);
l10=addlist(l10, 70, 212, false);
l11=addlist(l11, 70, 242, false);
l12=addlist(l12, 70, 272, true
lamp1=new lamp(l9,l0,2000,false,0);
lamp2=new lamp(l11,l5,2000,false,1);
lamp3=new lamp(l10,l6,2000,false,2);
lamp4=new lamp(l8,l2,2000,false,3);
islight = 0 ;
Thread t1=new Thread(lamp1); //创建并启动线程
Thread t2=new Thread(lamp2);
Thread t3=new Thread(lamp3);
Thread t4=new Thread(lamp4);
t1.start();
t2.start();
t3.start();
t4.start();
}
light addlist(light a,int x,int y,boolean sta) {
a=new light(x,y,sta);
lightlist.add(a);
return a;
}
public void addcar() { //生成小车
int now,next;
now=r.nextInt(4);
next=r.nextInt(4);
car testcar=null;
while(now==next)
next=r.nextInt(4);
switch(now) {
case 0:
testcar=new car(now,next,l0,l2,l3);
break;
case 1:
testcar=new car(now,next,l6,l5,l4);
break;
case 2:
testcar=new car(now,next,l9,l8,l7);
break;
case 3:
testcar=new car(now,next,l10,l11,l12);
break;
}
carlist.add(testcar);
Thread catt=new Thread(testcar);
catt.start();
}
public void LampChange() {
islight=(islight+1)%4;
}
public void paint(Graphics g) {
super.paint(g);
g.setColor(Color.darkGray); //画路
g.fillRect(0, 100, 400, 6);
g.fillRect(0, 300, 400, 6);
g.fillRect(100, 0, 6, 400);
g.fillRect(300, 0, 6, 400);
g.setColor(Color.gray);
g.fillRect(0, 200, 400, 2);
g.fillRect(200, 0, 2, 400);
g.setColor(Color.blue);
g.setColor(Color.black); //画信号灯板
g.fillRect(202,306, 100, 40);
g.fillRect(306,106, 40, 100);
g.fillRect(106,60, 100, 40);
g.fillRect(60,202,40, 100);
light temp;
car buf;
for(int i=0;iwelcomepanel类：
package traffic;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import javax.swing.JPanel;
public class welcomepanel extends JPanel implements Runnable{ //开始界面
int info = 0;
Boolean isLive=true;
public void paint(Graphics g) {
super.paint(g);
g.fillRect(0, 0, 420,450);
g.setColor(Color.red);
g.setFont(new Font("微软雅黑", Font.BOLD, 30));
if (info % 2 == 0) {
g.drawString("多线程红绿灯模拟", 80, 150);
}
}
public void run() {
// TODO Auto-generated method stub
while (true) {
try {
Thread.sleep(100);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
info++;
this.repaint();
if (isLive == false) {
break;
}
}
}
}set类：
package traffic;
import java.awt.FlowLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextField;
public class set extends JFrame implements ActionListener { //设置界面
JLabel lab1,lab2,lab3,lab4;
JTextField jtext1,jtext2,jtext3,jtext4;
JPanel panel1,panel2,panel3,panel4;
JButton jb1,jb2;
int time1,time2,time3,time4;
public set(){
lab1=new JLabel("南北左转东西：");
lab2=new JLabel("东西直行：");
lab3=new JLabel("东西左转南北：");
lab4=new JLabel("南北直行：");
time1=mainclass.panel.lamp1.getgreentime();
time2=mainclass.panel.lamp2.getgreentime();
time3=mainclass.panel.lamp3.getgreentime();
time4=mainclass.panel.lamp4.getgreentime();
jtext1=new JTextField(String.valueOf(time1));
jtext2=new JTextField(String.valueOf(time2));
jtext3=new JTextField(String.valueOf(time3));
jtext4=new JTextField(String.valueOf(time4));
jb1=new JButton("确定");
jb1.addActionListener(this);
jb2=new JButton("取消");
jb2.addActionListener(this);
this.setLayout(new GridLayout(5,2,10,5));
this.add(lab1);
this.add(jtext1);
this.add(lab2);
this.add(jtext2);
this.add(lab3);
this.add(jtext3);
this.add(lab4);
this.add(jtext4);
this.add(jb1);
this.add(jb2);
this.setLocationRelativeTo(null);
this.setSize(200, 200);
this.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
this.setResizable(false);
this.setVisible(true);
}
public void actionPerformed(ActionEvent e) {
if(e.getSource()==jb1) {
if(jtext1.getText().length()==0||jtext2.getText().length()==0||jtext3.getText().length()==0||jtext4.getText().length()==0)
JOptionPane.showMessageDialog(this, "请输入完整数据！", "错误", JOptionPane.INFORMATION_MESSAGE);
else {
mainclass.panel.lamp1.setgreentime(Integer.parseInt(jtext1.getText()));
mainclass.panel.lamp2.setgreentime(Integer.parseInt(jtext2.getText()));
mainclass.panel.lamp3.setgreentime(Integer.parseInt(jtext3.getText()));
mainclass.panel.lamp4.setgreentime(Integer.parseInt(jtext4.getText()));
this.dispose();
}
}else if(e.getSource()==jb2){
this.dispose();
}
}
}mainclass主类：
package traffic;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JOptionPane;
public class mainclass extends JFrame implements ActionListener{
static Mypanel panel;
JMenuBar jmb;
JMenu jm1, jm2;
JMenuItem jmi1, jmi2,jmi3,jmi4;
welcomepanel sp;
mainclass(){
this.setTitle("traffic lamp");
this.setSize(420,450);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
jmb=new JMenuBar();
jm1=new JMenu("控制");
jm2=new JMenu("设置");
jmi1=new JMenuItem("开始模拟");
jmi1.addActionListener(this);
jmi2=new JMenuItem("退出模拟");
jmi2.addActionListener(this);
jmi3=new JMenuItem("随机生成小车");
jmi3.addActionListener(this);
jmi4=new JMenuItem("更改绿灯时间");
jmi4.addActionListener(this);
jm1.add(jmi1);
jm1.add(jmi2);
jm1.add(jmi3);
jm2.add(jmi4);
jmb.add(jm1);
jmb.add(jm2);
this.setJMenuBar(jmb);
sp=new welcomepanel();
Thread t=new Thread(sp);
t.start();
this.setContentPane(sp);
this.setLocationRelativeTo(null);
this.setResizable(false);
this.setVisible(true);
}
public void actionPerformed(ActionEvent e) {
if(e.getSource()==jmi1) {
sp.isLive=false;
this.remove(sp);
panel = new Mypanel();
this.setContentPane(panel);
this.setVisible(true);
}else if(e.getSource()==jmi2) {
System.exit(0);
}else if(e.getSource()==jmi3) {
if(panel==null)
JOptionPane.showMessageDialog(this, "请开始模拟再生成小车", "错误", JOptionPane.INFORMATION_MESSAGE);
else panel.addcar();
}else if (e.getSource() == jmi4) {
if(mainclass.panel==null)
JOptionPane.showMessageDialog(this, "请开始模拟再进行设置", "错误", JOptionPane.INFORMATION_MESSAGE);
else new set();
}
}
public static void main(String[] args) {
new mainclass();
}
}多线程正确性测试：
我们在lamp类的run（）方法中添加了一句控制台打印命令，每次进程运行时即会打印此进程的name成员
正确的打印结果应该为 0-1-2-3-4-0-1-2-3-4-.......-1-2-3-....
控制台的输出结果为：
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