synchronized添加在方法上时

/**
 *
 * 总结：当方法上添加synchronized时，只有当当前线程执行完，下一个线程才可以进入执行
 */
public class SychronizedMethod {

    public synchronized void print(){
        System.out.println(Thread.currentThread().getName()+"开始打印");
        try{
            sleep(1000);
        }catch (InterruptedException e){
            e.printStackTrace();
        }
        System.out.println(Thread.currentThread().getName()+"打印结束");
    }

    public static void main(String args[]){
        Test test = new Test();

        Thread t1 = new Thread(test);
        Thread t2 = new Thread(test);
        Thread t3 = new Thread(test);
        Thread t4 = new Thread(test);
        t1.start();
        t2.start();
        t3.start();
        t4.start();
    }
}

class Test implements Runnable{

    SychronizedMethod sychronizedMethod  = new SychronizedMethod();

    public void run(){
        sychronizedMethod.print();
    }
}

来源：CSDN

作者：max_yuyu

链接：https://blog.csdn.net/qq_40087726/article/details/103908937