首页 java jdk9 windows x64免安装版（openjdk9.0.4）

java jdk9 windows x64免安装版（openjdk9.0.4）

上传者： jia1309652 | 上传时间： 2024-08-16 09:54:17 | 文件大小： 177.54MB | 文件类型： GZ
Java JDK 9是Java开发工具包的一个重要版本，由OpenJDK项目开发并维护，它在Java发展历程中引入了一系列创新特性和改进。本版本为Windows 64位免安装版，意味着用户无需经历传统安装过程，只需解压缩文件，然后进行简单的配置即可使用。 JDK 9最重要的特性之一是模块化系统（Project Jigsaw），这是Java平台的一项长期计划，旨在提高可维护性、安全性和性能。模块化使得大型应用可以更有效地管理和加载其依赖，同时降低了启动时间和内存占用。在JDK 9中，Java标准库被打包成多个模块，例如`java.base`、`java.sql`等，开发者可以根据需求选择加载必要的模块。 JDK 9引入了新的命令行工具，例如`jlink`和`jimage`。`jlink`用于创建定制的运行时图像，它可以根据应用程序的需求链接所需的模块，从而减少部署大小和启动时间。`jimage`则是一个用于处理JDK镜像的工具，它允许查看和操作JDK的二进制文件格式。 此外，JDK 9增强了Javadoc，新增了`@implNote`、`@implSpec`和`@implDefault`注解，这些注解为实现者提供了更多的文档空间，以记录实现细节和非API规范。同时，JShell（也称为Read-Eval-Print Loop，简称REPL）作为新的命令行工具引入，使得开发者可以快速测试代码片段，提高了开发效率。 在语言层面，JDK 9引入了`私有接口方法`，这是一种仅限接口内部使用的私有方法，增强了接口的功能。另外，`多版本兼容JAR`（Maven的``属性）特性允许JAR文件包含针对不同Java版本的代码，这样库开发者可以利用新版本的特性，同时保持对旧版本的兼容。 在垃圾收集器方面，G1垃圾收集器在JDK 9中成为默认的垃圾收集器，它提供了一种平衡暂停时间和总体吞吐量的方法，并且支持大内存的应用场景。 为了提升性能，JDK 9对Java编译器（JEP 280）和JVM（JEP 291）进行了优化，包括改进的类型推断和类数据共享功能。同时，JDK 9还引入了HTTP/2客户端，这是一个全新的、高性能的HTTP客户端API，支持现代网络协议，提升了网络通信的效率。 在安全性方面，JDK 9对Java加密体系进行了升级，包括对TLS协议的支持和密码算法的更新，以应对不断变化的安全威胁。 Java JDK 9的Windows 64位免安装版提供了一种便捷的方式来体验和利用这个版本的新特性，只需解压缩并配置环境变量，开发者就能在自己的系统上轻松使用JDK 9的功能。为了确保能正常使用Java开发工具，别忘了将解压后的bin目录添加到系统的PATH环境变量中。

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