多线程实现的交替打印的多种实现形式。说白了就是使用java‘中的各种同步器实现这个交替打印的需求。
sync的实现方式
package com.AQS.JiaoTiDaYin;
/**
* @Author:XK
* @Date: Created in 12:00 2022/4/20
* @Description：多线程交替打印的多种实现方法 (sync)
**/
public class JiaotiDayinSync {
private static int counter=0;
private static Object object= new Object();
public static void main(String[] args) {
new Thread(new Runnable() {
@Override
public void run() {
int cnt = 0;
while (cnt<3){
synchronized (object){
if(counter%3!=0){
try {
object.wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
}else {
System.out.println("1");
cnt++;
counter++;
}
object.notifyAll();
}
}
}
}).start();
new Thread(new Runnable() {
@Override
public void run() {
int cnt = 0;
while (cnt<3){
synchronized (object){
if(counter%3!=1){
try {
object.wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
}else {
System.out.println("2");
cnt++;
counter++;
}
object.notifyAll();
}
}
}
}).start();
new Thread(new Runnable() {
@Override
public void run() {
int cnt = 0;
while (cnt<3){
synchronized (object){
if(counter%3!=2){
try {
object.wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
}else {
System.out.println("3");
cnt++;
counter++;
}
object.notifyAll();
}
}
}
}).start();
}
}
lock类 ReentrantLock的实现方式
package com.AQS.JiaoTiDaYin;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
/**
* @Author:XK
* @Date: Created in 12:10 2022/4/20
* @Description：lock实现 ReentrantLock实现
**/
public class Lock123 {
private static int state = 0;
private static Lock lock= new ReentrantLock();
public static void main(String[] args) {
new Thread(new Runnable() {
@Override
public void run() {
for (int i = 0; i < 3;) {
lock.lock();
try {
while (state%3==0){
System.out.println(1);
state++;
i++;
}
}finally {
lock.unlock();
}
}
}
}).start();
new Thread(new Runnable() {
@Override
public void run() {
for (int i = 0; i < 3;) {
lock.lock();
try {
while (state%3==1){
System.out.println(2);
state++;
i++;
}
}finally {
lock.unlock();
}
}
}
}).start();
new Thread(new Runnable() {
@Override
public void run() {
for (int i = 0; i < 3;) {
lock.lock();
try {
while (state%3==2){
System.out.println(3);
state++;
i++;
}
}finally {
lock.unlock();
}
}
}
}).start();
}
}
semaphore信号量实现
package com.AQS.JiaoTiDaYin;
import java.util.concurrent.Semaphore;
/**
* @Author:XK
* @Date: Created in 14:41 2022/4/20
* @Description：
**/
public class Sema123 {
private static Semaphore A = new Semaphore(1);
private static Semaphore B = new Semaphore(0);
private static Semaphore C = new Semaphore(0);
public static void main(String[] args) {
new Thread(new Runnable() {
@Override
public void run() {
for (int i = 0; i < 3; i++) {
try {
A.acquire();
System.out.println(1);
B.release();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}).start();
new Thread(new Runnable() {
@Override
public void run() {
for (int i = 0; i < 3; i++) {
try {
B.acquire();
System.out.println(2);
C.release();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}).start();
new Thread(new Runnable() {
@Override
public void run() {
for (int i = 0; i < 3; i++) {
try {
C.acquire();
System.out.println(3);
A.release();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}).start();
}
}