三个线程交替打印十次ABC

package com.example.demo.thread;

/**
 * @author wangdongjiang
 */
public class Work {
    private volatile static String flag = "A";
    private static int countA = 0;
    private static int countB = 0;
    private static int countC = 0;

    public void methodA() {
        while (true) {
            //如果打印次数小于10就打印
            if (countA < 10 && flag.equals("A")) {
                System.out.println("A");
                flag = "B";
                countA = countA + 1;
            }
        }
    }

    public void methodB() {
        while (true) {
            //如果打印次数小于10就打印
            if (countB < 10 && flag.equals("B")) {
                System.out.println("B");
                flag = "C";
                countB = countB + 1;
            }
        }
    }


    public void methodC() {
        while (true) {
            //如果打印次数小于10就打印
            if (countC < 10 && flag.equals("C")) {
                System.out.println("C");
                flag = "A";
                countC = countC + 1;
            }
        }
    }
}

package com.example.demo.thread;

public class MyA implements Runnable {

    private Work work;

    public MyA(Work work) {
        this.work = work;
    }

    @Override
    public void run() {
        work.methodA();
    }
}

package com.example.demo.thread;

public class MyB implements Runnable {

    private Work work;

    public MyB(Work work) {
        this.work = work;
    }

    @Override
    public void run() {
        work.methodB();
    }
}

package com.example.demo.thread;

public class MyC implements Runnable {

    private Work work;

    public MyC(Work work) {
        this.work = work;
    }

    @Override
    public void run() {
        work.methodC();
    }
}

package com.example.demo.thread;

/**
 * @author wangdongjiang
 */
public class Hello {

    public static void main(String[] args) throws InterruptedException {
        final Work work = new Work();
        final MyA myA = new MyA(work);
        final MyB myB = new MyB(work);
        final MyC myC = new MyC(work);

        final Thread thread1 = new Thread(myA);
        final Thread thread2 = new Thread(myB);
        final Thread thread3 = new Thread(myC);

        thread1.start();
        thread2.start();
        thread3.start();

        Thread.sleep(100000000L);

    }


}

打印结果：

H:JDK1.8injava.exe "-javaagent:H:IntelliJ IDEA 2020.3.2libidea_rt.jar=53950:H:IntelliJ IDEA 2020.3.2in" -Dfile.encoding=UTF-8 -classpath H:JDK1.8jrelibcharsets.jar;H:JDK1.8jrelibdeploy.jar;H:JDK1.8jrelibextaccess-bridge-64.jar;H:JDK1.8jrelibextcldrdata.jar;H:JDK1.8jrelibextdnsns.jar;H:JDK1.8jrelibextjaccess.jar;H:JDK1.8jrelibextjfxrt.jar;H:JDK1.8jrelibextlocaledata.jar;H:JDK1.8jrelibext ashorn.jar;H:JDK1.8jrelibextsunec.jar;H:JDK1.8jrelibextsunjce_provider.jar;H:JDK1.8jrelibextsunmscapi.jar;H:JDK1.8jrelibextsunpkcs11.jar;H:JDK1.8jrelibextzipfs.jar;H:JDK1.8jrelibjavaws.jar;H:JDK1.8jrelibjce.jar;H:JDK1.8jrelibjfr.jar;H:JDK1.8jrelibjfxswt.jar;H:JDK1.8jrelibjsse.jar;H:JDK1.8jrelibmanagement-agent.jar;H:JDK1.8jrelibplugin.jar;H:JDK1.8jrelib esources.jar;H:JDK1.8jrelib t.jar;H:A_WorkCodedemo argetclasses;H:A_WorkRepositoryorgspringframeworkcloudspring-cloud-starter3.0.0spring-cloud-starter-3.0.0.jar;H:A_WorkRepositoryorgspringframeworkootspring-boot-starter2.4.2spring-boot-starter-2.4.2.jar;H:A_WorkRepositoryorgspringframeworkootspring-boot-starter-logging2.4.2spring-boot-starter-logging-2.4.2.jar;H:A_WorkRepositorychqoslogbacklogback-classic1.2.3logback-classic-1.2.3.jar;H:A_WorkRepositorychqoslogbacklogback-core1.2.3logback-core-1.2.3.jar;H:A_WorkRepositoryorgapachelogginglog4jlog4j-to-slf4j2.13.3log4j-to-slf4j-2.13.3.jar;H:A_WorkRepositoryorgapachelogginglog4jlog4j-api2.13.3log4j-api-2.13.3.jar;H:A_WorkRepositoryorgslf4jjul-to-slf4j1.7.30jul-to-slf4j-1.7.30.jar;H:A_WorkRepositoryjakartaannotationjakarta.annotation-api1.3.5jakarta.annotation-api-1.3.5.jar;H:A_WorkRepositoryorgyamlsnakeyaml1.27snakeyaml-1.27.jar;H:A_WorkRepositoryorgspringframeworkcloudspring-cloud-context3.0.0spring-cloud-context-3.0.0.jar;H:A_WorkRepositoryorgspringframeworksecurityspring-security-crypto5.4.2spring-security-crypto-5.4.2.jar;H:A_WorkRepositoryorgspringframeworkcloudspring-cloud-commons3.0.0spring-cloud-commons-3.0.0.jar;H:A_WorkRepositoryorgspringframeworksecurityspring-security-rsa1.0.9.RELEASEspring-security-rsa-1.0.9.RELEASE.jar;H:A_WorkRepositoryorgouncycastlecpkix-jdk15on1.64cpkix-jdk15on-1.64.jar;H:A_WorkRepositoryorgouncycastlecprov-jdk15on1.64cprov-jdk15on-1.64.jar;H:A_WorkRepositoryorgspringframeworkootspring-boot-devtools2.4.2spring-boot-devtools-2.4.2.jar;H:A_WorkRepositoryorgspringframeworkootspring-boot2.4.2spring-boot-2.4.2.jar;H:A_WorkRepositoryorgspringframeworkspring-context5.3.3spring-context-5.3.3.jar;H:A_WorkRepositoryorgspringframeworkspring-aop5.3.3spring-aop-5.3.3.jar;H:A_WorkRepositoryorgspringframeworkspring-beans5.3.3spring-beans-5.3.3.jar;H:A_WorkRepositoryorgspringframeworkspring-expression5.3.3spring-expression-5.3.3.jar;H:A_WorkRepositoryorgspringframeworkootspring-boot-autoconfigure2.4.2spring-boot-autoconfigure-2.4.2.jar;H:A_WorkRepositoryorgprojectlomboklombok1.18.16lombok-1.18.16.jar;H:A_WorkRepositoryorgslf4jslf4j-api1.7.30slf4j-api-1.7.30.jar;H:A_WorkRepositoryorgspringframeworkspring-core5.3.3spring-core-5.3.3.jar;H:A_WorkRepositoryorgspringframeworkspring-jcl5.3.3spring-jcl-5.3.3.jar com.example.demo.thread.Hello
A
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