*简单卖票

来源：互联网发布：软件大道附近租房编辑：程序博客网时间：2024/05/17 07:32

public class SimpleThread extends Thread{private static int ticNum = 100;//staticpublic void run(){while(true){if(ticNum>0){System.out.println(Thread.currentThread().getName()+"---:"+ticNum--);}else{break;}}}public static void main(String[] args){SimpleThread thread0 = new SimpleThread();SimpleThread thread1 = new SimpleThread();SimpleThread thread2 = new SimpleThread();SimpleThread thread3 = new SimpleThread();thread0.start();thread1.start();thread2.start();thread3.start();}}

public class SimpleThread implements Runnable{//安全问题private int ticNum = 100;//public void run(){while(true){if(ticNum>0){System.out.println(Thread.currentThread().getName()+"---:"+ticNum--);}else{break;}}}public static void main(String[] args){SimpleThread t = new SimpleThread();Thread thread0 = new Thread(t);Thread thread1 = new Thread(t);Thread thread2 = new Thread(t);Thread thread3 = new Thread(t);thread0.start();thread1.start();thread2.start();thread3.start();}}

安全问题演示：

public class SimpleThread implements Runnable{private int ticNum = 100;public void run(){while(true){if(ticNum>0){try{Thread.currentThread().sleep(50);}catch(InterruptedException e){e.printStackTrace();}System.out.println(Thread.currentThread().getName()+"---:"+ticNum--);}else{break;}}}public static void main(String[] args){SimpleThread t = new SimpleThread();Thread thread0 = new Thread(t);Thread thread1 = new Thread(t);Thread thread2 = new Thread(t);Thread thread3 = new Thread(t);thread0.start();thread1.start();thread2.start();thread3.start();}}

synchronized：

public class SimpleThread implements Runnable{private int ticNum = 100;public void run(){while(true){synchronized(this){//if(ticNum>0){System.out.println(Thread.currentThread().getName()+"---:"+ticNum--);}else{break;}}}}public static void main(String[] args){SimpleThread t = new SimpleThread();Thread thread0 = new Thread(t);Thread thread1 = new Thread(t);Thread thread2 = new Thread(t);Thread thread3 = new Thread(t);thread0.start();thread1.start();thread2.start();thread3.start();}}