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云消息队列 RocketMQ 版5.x版本实例可兼容Java ONS 1.x SDK客户端接入，您可以使用ONS 1.x SDK的接入5.x实例进行消息收发。本文为您介绍Java ONS 1.x SDK消息收发示例代码。

[帮助文档] 使用抢占式实例的系统盘快照创建自定义镜像以恢复被回收实例上的数据

抢占式实例可能会因为价格因素或者市场供需变化而被强制回收。如果您的抢占式实例上保存了重要数据，为避免数据丢失，您可以为该实例的系统盘创建快照并使用快照创建自定义镜像，然后使用该镜像新建抢占式实例以完成实例内的数据恢复。本文以Alibaba Cloud SDK for Java为例，介绍如何通过Jav...

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[帮助文档] 创建整个抢占式实例的自定义镜像以恢复被回收实例上的数据

抢占式实例可能会因为价格因素或者市场供需变化而被强制回收。如果您的抢占式实例上保存了重要数据，为避免数据丢失，您可以为该抢占式实例创建自定义镜像，然后使用该镜像新建抢占式实例以完成实例内的数据恢复。本文以Alibaba Cloud SDK for Java为例，介绍如何通过Java代码监控到抢占式实...

[帮助文档] 通过Workbench对Linux实例上的Java应用进行运维分析

Workbench的运维功能支持可视化地为Linux实例上的Java应用新增运维任务，例如新增Java堆分析、线程栈分析或性能分析任务。本文为您介绍Linux实例运维功能的具体操作和查看任务分析结果的具体方法。

[帮助文档] RocketMQ 4.x/3.x Java SDK接入5.x实例收发消息示例代码

云消息队列 RocketMQ 版5.x版本实例可兼容4.x/3.x SDK客户端接入，您可以使用4.x/3.x版本的SDK接入5.x实例进行消息收发。本文为您介绍4.x/3.x版本下的Java SDK消息收发示例代码。

【Java|多线程与高并发】线程安全问题以及synchronized使用实例

1. 前言Java多线程环境下，多个线程同时访问共享资源时可能出现的数据竞争和不一致的情况。线程安全一直都是一个令人头疼的问题.为了解决这个问题,Java为我们提供了很多方式.1.synchronized关键字、ReentrantLock类等。2.使用线程安全的数据结构，例如ConcurrentHa...

Java——多线程编程小实例：生产者-消费者问题（应用举例）

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编写Java程序，实现多线程操作同一个实例变量的操作会引发多线程并发的安全问题。

需求说明：多线程操作同一个实例变量的操作会引发多线程并发的安全问题。现有 3 个线程代表 3 只猴子，对类中的一个整型变量 count（代表花的总数，共 20 朵花）进行操作。该变量代表花的总数，不同猴子（线程）每采摘一次，花的总数少 1，直至所有花被不同的...

Java 基于Callable接口的线程实例

1. 背景之前已经实现了继承Thread的线程实例，也实现了基于Runnable接口的线程实例。这两种方式实现的线程，都是有一个run()方法，但是没法设置返回值。通过Callable接口，我们可以为线程设定返回值，然后可以等待获取返回值，非常好用。2. 代码实现 /** * 读文件大小 */ pu...

Java 基于Runnable接口的线程实例

1. 功能通过实现Runnable接口，开发线程，然后读取文件大小。2. 代码读取文件大小：package org.maoge.thread; import java.io.File; /** * 读取文件大小 */ public class ReadFileRunnable implements ...

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