1.JDK 和 JRE 有什么区别？ JDK：Java Development Kit 的简称，Java 开发工具包，提供了 Java 的开发环境和运行环境。 JRE：Java Runtime Environment 的简称，Java 运行环境，为 Java 的运行提供了所需环境。
The Paho Java Client is an MQTT client library written in Java for developing applications that run on the JVM or other Java compatible platforms such as Android The Paho Java Client provides two APIs ...
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