java多线程--买票(ticket)实验

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1.以继承Thread的方式：

package org.sh.diffdemo;public class MyThread extends Thread {private int ticket = 5;public void run(){for(int i =0;i<10;i++){if(this.ticket>0){System.out.println("买票：ticket="+this.ticket--);}}}}

package org.sh.diffdemo;public class ThreadTicket {public static void main(String[] args) {MyThread m1 = new MyThread();MyThread m2 = new MyThread();m1.start();m2.start();}}

发现结果买了十张票但是只有五张票，没有达到共享资源的目的，下面使用实现Runnable接口

2.以实现Runnable的方式：

package org.sh.diffdemo1;public class MyThread implements Runnable {private int ticket = 5;public void run(){for(int i =0;i<10;i++){if(this.ticket>0){System.out.println("买票：ticket="+this.ticket--);}}}}

package org.sh.diffdemo1;public class ThreadTicket {public static void main(String[] args) {MyThread m1 = new MyThread();Thread t1 = new Thread(m1);Thread t2 = new Thread(m1);t1.start();t2.start();}}

虽然是两个线程但是还是只是买了五张票，达到了共享资源的目的了。

在程序中加入延迟：

package org.sh.syndemo; class MyThread implements Runnable {private int ticket = 5;public void run(){for(int i =0;i<10;i++){if(this.ticket>0){try {Thread.sleep(1000);} catch (InterruptedException e) {e.printStackTrace();}System.out.println("买票：ticket="+this.ticket--);}}}}public class SynDemo01 {public static void main(String[] args) {MyThread m1 = new MyThread();Thread t1 = new Thread(m1);Thread t2 = new Thread(m1);t1.start();t2.start();}}

结果：

买票：ticket=5买票：ticket=5买票：ticket=4买票：ticket=4买票：ticket=3买票：ticket=2买票：ticket=1买票：ticket=0

相信这个结果大家都知道原因这里不解释了，对上面的代码进行同步即可

3.线程间的同步

package org.sh.syndemo; class MyThread implements Runnable {private int ticket = 5;public void run(){for(int i =0;i<10;i++){this.sale();}}public synchronized void sale(){if(this.ticket>0){try {Thread.sleep(1000);} catch (InterruptedException e) {e.printStackTrace();}System.out.println("买票：ticket="+this.ticket--);}}}public class SynDemo01 {public static void main(String[] args) {MyThread m1 = new MyThread();Thread t1 = new Thread(m1);Thread t2 = new Thread(m1);t1.start();t2.start();}}

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