线程八锁

情况1：12 或 21

@Slf4j(topic = "c.Number")
class Number{
public synchronized void a() {
log.debug("1");
}

public synchronized void b() {
log.debug("2");
}
}

public static void main(String[] args) {
Number n1 = new Number();
new Thread(()->{ n1.a(); }).start();
new Thread(()->{ n1.b(); }).start();
}

情况2：1s后12，或 2 1s后 1

@Slf4j(topic = "c.Number")
class Number{
public synchronized void a() {
sleep(1);
log.debug("1");
}

public synchronized void b() {
log.debug("2");
}

}

public static void main(String[] args) {
Number n1 = new Number();
new Thread(()->{ n1.a(); }).start();
new Thread(()->{ n1.b(); }).start();
}

情况3：3 1s 12 或 23 1s 1 或 32 1s 1

@Slf4j(topic = "c.Number")
class Number{
public synchronized void a() {
sleep(1);
log.debug("1");
}

public synchronized void b() {
log.debug("2");
}

public void c() {
log.debug("3");
}

}

public static void main(String[] args) {
Number n1 = new Number();
new Thread(()->{ n1.a(); }).start();
new Thread(()->{ n1.b(); }).start();
new Thread(()->{ n1.c(); }).start();
}

情况4：2 1s 后 1

@Slf4j(topic = "c.Number")
class Number{
public synchronized void a() {
sleep(1);
log.debug("1");

}

public synchronized void b() {
log.debug("2");
}

}

public static void main(String[] args) {
Number n1 = new Number();
Number n2 = new Number();
new Thread(()->{ n1.a(); }).start();
new Thread(()->{ n2.b(); }).start();
}

情况5：2 1s 后 1

@Slf4j(topic = "c.Number")
class Number{
public static synchronized void a() {
sleep(1);
log.debug("1");
}

public synchronized void b() {
log.debug("2");
}

}

public static void main(String[] args) {
Number n1 = new Number();
new Thread(()->{ n1.a(); }).start();
new Thread(()->{ n1.b(); }).start();
}

情况6：1s 后12，或 2 1s后 1

@Slf4j(topic = "c.Number")
class Number{
public static synchronized void a() {
sleep(1);
log.debug("1");

}

public static synchronized void b() {
log.debug("2");
}

}

public static void main(String[] args) {
Number n1 = new Number();
new Thread(()->{ n1.a(); }).start();
new Thread(()->{ n1.b(); }).start();
}

情况7：2 1s 后 1

@Slf4j(topic = "c.Number")
class Number{
public static synchronized void a() {
sleep(1);
log.debug("1");
}

public synchronized void b() {
log.debug("2");
}

}

public static void main(String[] args) {
Number n1 = new Number();
Number n2 = new Number();
new Thread(()->{ n1.a(); }).start();
new Thread(()->{ n2.b(); }).start();
}

情况8：1s 后12,或 2 1s后 1

class Number{
public static synchronized void a() {
sleep(1);
log.debug("1");
}

public static synchronized void b() {
log.debug("2");
}

}

public static void main(String[] args) {
Number n1 = new Number();
Number n2 = new Number();
new Thread(()->{ n1.a(); }).start();
new Thread(()->{ n2.b(); }).start();
}