使用sychronized实现线程安全

package com.leetcode.multithreading.licm;

/**
 * @description: aqs
 * @author: licm
 * @create: 2021-07-26 10:21
 **/


/**
 * 通过synchronized 实现线程安全
 *
 * i++是三步操作 所以用volitile不可以
 */
public class NotSafe {
    private  long count = 0;

    public long getCount() {
        return count;
    }

    public void setCount(long count) {
        this.count = count;
    }

    //count进行累加
    public  synchronized void incCount() {
        count++;
    }

    //线程
    private static class Count extends Thread {

        private NotSafe simplOper;

        public Count(NotSafe simplOper) {
            this.simplOper = simplOper;
        }

        @Override
        public void run() {
            for (int i = 0; i < 10000; i++) {
                simplOper.incCount();
            }
        }
    }

    public static void main(String[] args) throws InterruptedException {
        NotSafe simplOper = new NotSafe();
        //启动两个线程
        Count count1 = new Count(simplOper);
        Count count2 = new Count(simplOper);
        count1.start();
        count2.start();
        Thread.sleep(50);
        System.out.println(simplOper.count);//20000?
    }
}

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