java售票功能 java多线程模拟实现售票功能
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铁道部发布了一个售票任务，要求销售1000张票，要求有3个窗口来进行销售，请编写多线程程序来模拟这个效果。
1 线程类
测试方法：
public static void main(String[] args) {
MyThread t1 = new MyThread("窗口1");
MyThread t2 = new MyThread("窗口1");
MyThread t3 = new MyThread("窗口1");
t1.start();
t2.start();
t3.start();
}
1.1 局部加锁
public class MyThread extends Thread{
private static int ticket = 1000;
private static Object obj = new Object();
public MyThread(String name) {
super(name);
}
@Override
public void run() {
while(ticket > 0){
synchronized(obj){
if(ticket > 0){
System.out.println(Thread.currentThread().getName() + "正在销售第" +(1001-ticket)+ "张票");
ticket--;
}
if(ticket <= 0){
System.out.println(Thread.currentThread().getName() + "票已售罄");
}
}
}
}
}
1.2 方法加锁
public class MyThread extends Thread{
private static int ticket = 1000;
public MyThread(String name) {
super(name);
}
@Override
public void run() {
while(ticket > 0){
method02();
}
}
//锁对象：类的字节码文件对象（MyThread.class），有static修饰
public static synchronized void method02(){
if(ticket > 0){
System.out.println(Thread.currentThread().getName() + "正在销售第" +(1001-ticket)+ "张票");
ticket--;
}
if(ticket <= 0){
System.out.println(Thread.currentThread().getName() + "票已售完");
}
}
}
1.3 手动加锁
public class MyThread extends Thread{
private static int ticket = 1000;
private static Lock lock = new ReentrantLock();
public MyThread(String name) {
super(name);
}
@Override
public void run() {
while(ticket > 0){
lock.lock();//手动上锁
if(ticket > 0){
System.out.println(Thread.currentThread().getName() + "正在销售第" +(1001-ticket)+ "张票");
ticket--;
}
if(ticket <= 0){
System.out.println(Thread.currentThread().getName() + "票已售完");
}
lock.unlock();//手动解锁
}
}
}
2 任务类
测试方法：
public static void main(String[] args) {
Task task = new Task();
Thread t1 = new Thread(task, "窗口1");
Thread t2 = new Thread(task, "窗口2");
Thread t3 = new Thread(task, "窗口3");
t1.start();
t2.start();
t3.start();
}
2.1 局部加锁
public class Task implements Runnable{
private int tickets=1000;
@Override
public void run() {
while(tickets>0){
synchronized (this) {
if(tickets > 0)
{
System.out.printf ("%s窗口正在售出第%d张票\n",Thread.currentThread().getName(),1001-tickets);
tickets--;
}
if(tickets<=0){
System.out.printf("%s窗口售罄\n",Thread.currentThread().getName());
}
}
}
}
}
2.2 方法加锁
public class Task implements Runnable{
private int tickets=1000;
@Override
public void run() {
while(tickets>0){
method();
}
}
//方法加锁，没有使用static修饰
public synchronized void method(){
if(tickets > 0)
{
System.out.printf ("%s窗口正在售出第%d张票\n",Thread.currentThread().getName(),1001-tickets);
tickets--;
}
if(tickets<=0){
System.out.printf("%s窗口售罄\n",Thread.currentThread().getName());
}
}
}
2.3 手动加锁
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
public class Task implements Runnable{
private int tickets=1000;
private Lock lock =new ReentrantLock();
@Override
public void run() {
while(tickets>0){
lock.lock();//手动上锁
if(tickets > 0)
{
System.out.printf ("%s窗口正在售出第%d张票\n",Thread.currentThread().getName(),1001-tickets);
tickets--;
}
if(tickets<=0){
System.out.printf("%s窗口售罄\n",Thread.currentThread().getName());
}
lock.unlock();//手动关锁
}
}
}
效果截图：
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