多线程 同步 简单示例

import java.util.Arrays;

public class maopao extends Thread{
 
 public static int a=9;
 
 String k=new String("");
 @Override
 public void  run() {
  // TODO Auto-generated method stub
  System.out.println("进入线程");
  super.run();
  synchronized (k){  
  try {
      
   this.sleep(6000);
  } catch (InterruptedException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
  
      for(int i=0;i<6;i++){
      
       System.out.println(i);
   }
      
      }
 }

 public static void main(String[] args) {
   // 一种方法 
   maopao m=new maopao();
      Thread t1=new Thread(m);
      Thread t2=new Thread(m);
      Thread t3=new Thread(m);
   t1.start();
   t2.start();
   t3.start(); 
 
 }

 

 

 

 

 

 

 

多窗口售票系统   线程

package net.okren.java;

class SaleTicket implements Runnable{
    private int tickets = 100;
    public void run(){
        while(tickets > 0){
            sale();
        }
    }

    private synchronized void sale(){
        if(tickets > 0){
            System.out.println(Thread.currentThread().getName() + "卖出 第 "+ (100 - tickets + 1)+"张票");
            tickets--;
            try{
                Thread.sleep(500);
            }catch(InterruptedException e){
                e.printStackTrace();
            }
        }
    }
}

public class JavaTest {

    public static void main(String[] args){

        SaleTicket st = new SaleTicket();
        Thread t1 = new Thread(st, "一号窗口");
        Thread t2 = new Thread(st, "二号窗口");
        Thread t3 = new Thread(st, "三号窗口");
        Thread t4 = new Thread(st,"四号窗口 ");
        t1.start();
        t2.start();
        t3.start();
        t4.start();



    }
}