【未解决】docker stack deploy 个别container通过 inprogress 网络访问不正常

问题： docker stack deploy 个别container通过 inprogress 网络访问不正… Read More

【未解决】KeepAlived 配置备忘

问题：解决：还有问题同网段内实现 keepalived 挂掉后自动切换，但… Read More

Docker Mysql 主从复制配置备忘

问题：解决： master: 编辑文件./master_conf.… Read More

IBM OpenLiberty 开源了，它怎么样？

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Maven Nexus 私服备忘

问题：如何搭建 Maven 私服解决：发布jar 流程 docker run… Read More

Java FutureTask demo

问题：解决：

//FutureTaskTest.java
//javac FutureTaskTest.java && java FutureTaskTest

import java.util.concurrent.*;

public class FutureTaskTest{
        public static void main(String[] argv) throws Exception{
                Callable<String> c = ()->{
                        try{Thread.sleep(1000);}catch(Exception e){}
                        return "hello";
                };      
                FutureTask<String> task = new FutureTask<>(c);
                new Thread(task).start();
                System.out.println("wait for get..");
                String ret = task.get();
                System.out.println("get() return "+ret);
        }
}
~

//FutureTaskTest.java

//javac FutureTaskTest.java && java FutureTaskTest

import java.util.concurrent.*;

public class FutureTaskTest{

public static void main(String[] argv) throws Exception{

Callable<String> c = ()->{

try{Thread.sleep(1000);}catch(Exception e){}

return "hello";

};

FutureTask<String> task = new FutureTask<>(c);

new Thread(task).start();

System.out.println("wait for get..");

String ret = task.get();

System.out.println("get() return "+ret);

}

Java CountDownLatch demo

问题：解决： [crayon-673ed31b58aa371713… Read More

Java Exchanger 基本用法 demo

问题：解决：

//ExchangerTest.java
//javac ExchangerTest.java && java ExchangerTest

import java.util.concurrent.*;

class ExchangerTest{
        public static void main(String[] argv){
                Exchanger<String> ex = new Exchanger<>();
                Thread t1 = new  Thread(()->{
                        try{
                                String msg = ex.exchange("T1 welcome");
                                System.out.println("t1 get msg : "+msg);
                        }catch(Exception e){}
                });
                t1.start();

                Thread t2 = new  Thread(()->{
                        try{
                                Thread.sleep(1000);
                                String msg = ex.exchange("T2 welcome");
                                System.out.println("t2 get msg : "+msg);
                        }catch(Exception e){}
                });
                t2.start();
        }
}

//ExchangerTest.java

//javac ExchangerTest.java && java ExchangerTest

import java.util.concurrent.*;

class ExchangerTest{

public static void main(String[] argv){

Exchanger<String> ex = new Exchanger<>();

Thread t1 = new Thread(()->{

try{

String msg = ex.exchange("T1 welcome");

System.out.println("t1 get msg : "+msg);

}catch(Exception e){}

});

t1.start();

Thread t2 = new Thread(()->{

try{

Thread.sleep(1000);

String msg = ex.exchange("T2 welcome");

System.out.println("t2 get msg : "+msg);

}catch(Exception e){}

});

t2.start();

}

Java Semaphore 基本用法 demo

问题解决： [crayon-673ed31b59a86628193… Read More

JPA 创建表时的默认编码如何指定？

问题： hibername JPA 创建表时的默认编码如何指定？解… Read More

IT问题

程序员的疑难杂症录

月份：2017年9月