synchronized 同步调用非同步

同步方法里面可以调用非同步方法

public class T1 {

    // 示例演示同步方法和非同步方法同时调用
    synchronized void m() {
        System.out.println("synchronized method" + new Date());
        n();
    }

    void n() {
        System.out.println("not synchronized method" + new Date());
    }

    public static void main(String[] args) throws InterruptedException {
        CountDownLatch start = new CountDownLatch(1);
        CountDownLatch end = new CountDownLatch(10);

        T1 t = new T1();
        for (int i = 0; i < 10; i++) {
            new Thread(() -> {
                try {
                    start.await();
                    t.m();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                } finally {
                    end.countDown();
                }
            }).start();
        }
        start.countDown();
        end.await();
    }
}

输出结果：
synchronized methodThu Oct 29 13:43:37 CST 2020
not synchronized methodThu Oct 29 13:43:37 CST 2020
synchronized methodThu Oct 29 13:43:37 CST 2020
not synchronized methodThu Oct 29 13:43:37 CST 2020
synchronized methodThu Oct 29 13:43:37 CST 2020
not synchronized methodThu Oct 29 13:43:37 CST 2020
synchronized methodThu Oct 29 13:43:37 CST 2020
not synchronized methodThu Oct 29 13:43:37 CST 2020
synchronized methodThu Oct 29 13:43:37 CST 2020
not synchronized methodThu Oct 29 13:43:37 CST 2020
synchronized methodThu Oct 29 13:43:37 CST 2020
not synchronized methodThu Oct 29 13:43:37 CST 2020
synchronized methodThu Oct 29 13:43:37 CST 2020
not synchronized methodThu Oct 29 13:43:37 CST 2020
synchronized methodThu Oct 29 13:43:37 CST 2020
not synchronized methodThu Oct 29 13:43:37 CST 2020
synchronized methodThu Oct 29 13:43:37 CST 2020
not synchronized methodThu Oct 29 13:43:37 CST 2020
synchronized methodThu Oct 29 13:43:37 CST 2020
not synchronized methodThu Oct 29 13:43:37 CST 2020

同步方法和非同步方法可同时调用

public class T1 {


    // 示例演示同步方法和非同步方法同时调用
    synchronized void m() {
        System.out.println("synchronized method" + new Date());
    }

    void n() {
        System.out.println("not synchronized method" + new Date());
    }

    public static void main(String[] args) throws InterruptedException {
        CountDownLatch start = new CountDownLatch(1);
        CountDownLatch end = new CountDownLatch(10);

        T1 t = new T1();
        for (int i = 0; i < 10; i++) {
            new Thread(() -> {
                try {
                    start.await();
                    t.m();
                    t.n();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                } finally {
                    end.countDown();
                }
            }).start();
            new Thread(() -> {
                try {
                    start.await();
                    t.m();
                    t.n();
                } catch (Exception e) {
                    e.printStackTrace();
                } finally {
                    end.countDown();
                }
            }).start();
        }
        start.countDown();
        end.await();
    }
}

输出结果
synchronized methodThu Oct 29 13:44:28 CST 2020
not synchronized methodThu Oct 29 13:44:28 CST 2020
synchronized methodThu Oct 29 13:44:28 CST 2020
not synchronized methodThu Oct 29 13:44:28 CST 2020
synchronized methodThu Oct 29 13:44:28 CST 2020
not synchronized methodThu Oct 29 13:44:28 CST 2020
synchronized methodThu Oct 29 13:44:28 CST 2020
not synchronized methodThu Oct 29 13:44:28 CST 2020
synchronized methodThu Oct 29 13:44:28 CST 2020
not synchronized methodThu Oct 29 13:44:28 CST 2020
synchronized methodThu Oct 29 13:44:28 CST 2020
not synchronized methodThu Oct 29 13:44:28 CST 2020
synchronized methodThu Oct 29 13:44:28 CST 2020
not synchronized methodThu Oct 29 13:44:28 CST 2020
synchronized methodThu Oct 29 13:44:28 CST 2020
not synchronized methodThu Oct 29 13:44:28 CST 2020
synchronized methodThu Oct 29 13:44:28 CST 2020
not synchronized methodThu Oct 29 13:44:28 CST 2020
synchronized methodThu Oct 29 13:44:28 CST 2020
not synchronized methodThu Oct 29 13:44:28 CST 2020
synchronized methodThu Oct 29 13:44:28 CST 2020
not synchronized methodThu Oct 29 13:44:28 CST 2020
synchronized methodThu Oct 29 13:44:28 CST 2020
not synchronized methodThu Oct 29 13:44:28 CST 2020
synchronized methodThu Oct 29 13:44:28 CST 2020
not synchronized methodThu Oct 29 13:44:28 CST 2020
synchronized methodThu Oct 29 13:44:28 CST 2020
not synchronized methodThu Oct 29 13:44:28 CST 2020
synchronized methodThu Oct 29 13:44:28 CST 2020
not synchronized methodThu Oct 29 13:44:28 CST 2020
synchronized methodThu Oct 29 13:44:28 CST 2020
not synchronized methodThu Oct 29 13:44:28 CST 2020
synchronized methodThu Oct 29 13:44:28 CST 2020
not synchronized methodThu Oct 29 13:44:28 CST 2020
synchronized methodThu Oct 29 13:44:28 CST 2020
not synchronized methodThu Oct 29 13:44:28 CST 2020
synchronized methodThu Oct 29 13:44:28 CST 2020
not synchronized methodThu Oct 29 13:44:28 CST 2020
synchronized methodThu Oct 29 13:44:28 CST 2020
not synchronized methodThu Oct 29 13:44:28 CST 2020