初识并发问题

package demo1;
//多个线程同时操作一个对象，线程不安全，数据紊乱
public class TestThread4 implements Runnable{
    private int ticket = 10;

    @Override
    public void run() {
        while (true){
            if(ticket<=0){
                break;
            }
            try {
                Thread.sleep(100);
            } catch (Exception e) {
                throw new RuntimeException(e);
            }
            System.out.println(Thread.currentThread().getName()+"获得了第"+ticket--+"张票");
        }
    }

    public static void main(String[] args) {
        TestThread4 testThread4 = new TestThread4();
        new Thread(testThread4,"小明").start();
        new Thread(testThread4,"小蓝").start();
        new Thread(testThread4,"小红").start();
        new Thread(testThread4,"小三").start();
        System.out.println(testThread4.ticket);
    }
}