学習プロセスのビデオを
ご覧ください：[Crazy God Says Java] https://www.bilibili.com/video/BV1B7411L7tE?p=2
皆さん、とても良心的な先生をサポートしてください。
同期との比較
Javaコード
package com.zjl;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
/**
* Created by zjl
* 2020/11/20
**/
/*
* 1、线程之间的通信问题：生产者和消费者问题！
* 2、线程交替执行，A B 操作同一个变量 num = 0
* 3、A num+1
* 4、B num-1
* */
public class Test2 {
public static void main(String[] args) {
Data data = new Data();
new Thread(()->{
for (int i = 0; i < 10; i++) {
try {
data.increment();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}).start();
new Thread(()->{
for (int i = 0; i < 10; i++) {
try {
data.decrement();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}).start();
new Thread(()->{
for (int i = 0; i < 10; i++) {
try {
data.increment();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}).start();
new Thread(()->{
for (int i = 0; i < 10; i++) {
try {
data.decrement();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}).start();
}
}
//等待-----》业务-----》通知
class Data2{
//数字，资源类
private int number = 0;
Lock lock = new ReentrantLock();
Condition condition = lock.newCondition();
//+1
public void increment() throws InterruptedException {
lock.lock();
try {
while (number!=0){
//等待
condition.await();
}
number++;
System.out.println("我加一完毕了+++++++++++++++++++++++++唤醒其他线程减一" + number);
condition.signalAll();
} catch (InterruptedException e) {
e.printStackTrace();
} finally {
lock.unlock();
}
}
//-1
public void decrement() throws InterruptedException {
lock.lock();
try {
while (number == 0){
//等待
condition.await();
number--;
System.out.println("我减一完毕了--------------------------唤醒其他线程加一" + number);
condition.signalAll();
}
} catch (InterruptedException e) {
e.printStackTrace();
} finally {
lock.unlock();
}
}
}
の結果
/Library/Java/JavaVirtualMachines/jdk1.8.0_231.jdk/Contents/Home/bin/java "-javaagent:/Users/zhangjianlong/Library/Application Support/JetBrains/Toolbox/apps/IDEA-U/ch-0/193.5662.53/IntelliJ IDEA.app/Contents/lib/idea_rt.jar=60339:/Users/zhangjianlong/Library/Application Support/JetBrains/Toolbox/apps/IDEA-U/ch-0/193.5662.53/IntelliJ IDEA.app/Contents/bin" -Dfile.encoding=UTF-8 -classpath /Library/Java/JavaVirtualMachines/jdk1.8.0_231.jdk/Contents/Home/jre/lib/charsets.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_231.jdk/Contents/Home/jre/lib/deploy.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_231.jdk/Contents/Home/jre/lib/ext/cldrdata.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_231.jdk/Contents/Home/jre/lib/ext/dnsns.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_231.jdk/Contents/Home/jre/lib/ext/jaccess.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_231.jdk/Contents/Home/jre/lib/ext/jfxrt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_231.jdk/Contents/Home/jre/lib/ext/localedata.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_231.jdk/Contents/Home/jre/lib/ext/nashorn.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_231.jdk/Contents/Home/jre/lib/ext/sunec.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_231.jdk/Contents/Home/jre/lib/ext/sunjce_provider.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_231.jdk/Contents/Home/jre/lib/ext/sunpkcs11.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_231.jdk/Contents/Home/jre/lib/ext/zipfs.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_231.jdk/Contents/Home/jre/lib/javaws.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_231.jdk/Contents/Home/jre/lib/jce.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_231.jdk/Contents/Home/jre/lib/jfr.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_231.jdk/Contents/Home/jre/lib/jfxswt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_231.jdk/Contents/Home/jre/lib/jsse.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_231.jdk/Contents/Home/jre/lib/management-agent.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_231.jdk/Contents/Home/jre/lib/plugin.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_231.jdk/Contents/Home/jre/lib/resources.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_231.jdk/Contents/Home/jre/lib/rt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_231.jdk/Contents/Home/lib/ant-javafx.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_231.jdk/Contents/Home/lib/dt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_231.jdk/Contents/Home/lib/javafx-mx.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_231.jdk/Contents/Home/lib/jconsole.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_231.jdk/Contents/Home/lib/packager.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_231.jdk/Contents/Home/lib/sa-jdi.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_231.jdk/Contents/Home/lib/tools.jar:/Users/zhangjianlong/testCode/JUC-study/target/classes:/Users/zhangjianlong/apache-maven-3.6.3/repository/org/projectlombok/lombok/1.18.8/lombok-1.18.8.jar com.zjl.Test2
我加一完毕了+++++++++++++++++++++++++唤醒其他线程减一1
我减一完毕了--------------------------唤醒其他线程加一0
我加一完毕了+++++++++++++++++++++++++唤醒其他线程减一1
我减一完毕了--------------------------唤醒其他线程加一0
我加一完毕了+++++++++++++++++++++++++唤醒其他线程减一1
我减一完毕了--------------------------唤醒其他线程加一0
我加一完毕了+++++++++++++++++++++++++唤醒其他线程减一1
我减一完毕了--------------------------唤醒其他线程加一0
我加一完毕了+++++++++++++++++++++++++唤醒其他线程减一1
我减一完毕了--------------------------唤醒其他线程加一0
我加一完毕了+++++++++++++++++++++++++唤醒其他线程减一1
我减一完毕了--------------------------唤醒其他线程加一0
我加一完毕了+++++++++++++++++++++++++唤醒其他线程减一1
我减一完毕了--------------------------唤醒其他线程加一0
我加一完毕了+++++++++++++++++++++++++唤醒其他线程减一1
我减一完毕了--------------------------唤醒其他线程加一0
我加一完毕了+++++++++++++++++++++++++唤醒其他线程减一1
我减一完毕了--------------------------唤醒其他线程加一0
我加一完毕了+++++++++++++++++++++++++唤醒其他线程减一1
我减一完毕了--------------------------唤醒其他线程加一0
我加一完毕了+++++++++++++++++++++++++唤醒其他线程减一1
我减一完毕了--------------------------唤醒其他线程加一0
我加一完毕了+++++++++++++++++++++++++唤醒其他线程减一1
我减一完毕了--------------------------唤醒其他线程加一0
我加一完毕了+++++++++++++++++++++++++唤醒其他线程减一1
我减一完毕了--------------------------唤醒其他线程加一0
我加一完毕了+++++++++++++++++++++++++唤醒其他线程减一1
我减一完毕了--------------------------唤醒其他线程加一0
我加一完毕了+++++++++++++++++++++++++唤醒其他线程减一1
我减一完毕了--------------------------唤醒其他线程加一0
我加一完毕了+++++++++++++++++++++++++唤醒其他线程减一1
我减一完毕了--------------------------唤醒其他线程加一0
我加一完毕了+++++++++++++++++++++++++唤醒其他线程减一1
我减一完毕了--------------------------唤醒其他线程加一0
我加一完毕了+++++++++++++++++++++++++唤醒其他线程减一1
我减一完毕了--------------------------唤醒其他线程加一0
我加一完毕了+++++++++++++++++++++++++唤醒其他线程减一1
我减一完毕了--------------------------唤醒其他线程加一0
我加一完毕了+++++++++++++++++++++++++唤醒其他线程减一1
我减一完毕了--------------------------唤醒其他线程加一0
Process finished with exit code 0