jdk-11.0.18-linux-aarch64-bin.tar.gz
Java Development Kit（JDK）是Java编程语言的核心组件，它为开发者提供了编译、调试和运行Java应用程序所需的所有工具。`jdk-11.0.18-linux-aarch64-bin.tar.gz` 是一个针对ARM64架构的JDK 11发行版的压缩文件，适用于基于Linux操作系统的64位ARM处理器。ARM64架构，也称为AArch64，是ARM公司的一种64位指令集架构，广泛应用于移动设备、服务器和嵌入式系统。
在JDK 11中，有一些重要的特性值得关注：
1. **模块化系统（Project Jigsaw）**：这是Java 9引入的重要特性，但在JDK 11中得到了进一步的优化和完善。模块化系统将JDK分解为独立的模块，有助于提高代码的封装性和可维护性，同时也减少了运行时内存需求。
2. **HTTP客户端API（JSR 353）**：JDK 11内置了一个新的HTTP客户端API，位于`java.net.http`包下，提供了一种更现代、更易于使用的接口来执行HTTP和HTTPS请求。
3. **动态类型语言支持（JEP 335）**：JDK 11增加了对动态类型语言的支持，使得JShell（也称为REPL，Read-Eval-Print Loop）可以处理这些语言的脚本。
4. **改进的垃圾收集器**：JDK 11引入了G1垃圾收集器的默认设置，这是一个并行和并发的垃圾收集器，旨在减少停顿时间并提供可预测的性能。同时，ZGC（Z Garbage Collector）也在JDK 11中作为实验特性提供，它是一个低延迟的垃圾收集器，适合大数据和云环境。
5. **文本块（Text Blocks）**：Java 11引入了文本块（多行字符串字面量）的预览特性，允许程序员方便地处理多行文本，减少字符串连接操作和转义字符的使用。
6. **其他语言特性和API增强**：包括对TLS协议的更新、改进的IPv6支持、新的`ProcessHandle` API以及对Java国际化和日期时间API的增强等。
解压`jdk-11.0.18-linux-aarch64-bin.tar.gz`后，你会得到一个包含JDK目录结构的文件夹，如`jdk-11.0.18`。这个目录中包含了`bin`、`conf`、`include`、`jmods`、`legal`、`lib`和`man`等子目录，它们分别存放着可执行文件、配置文件、头文件、模块描述文件、法律文档、库文件和帮助文档等。
- **bin** 目录：包含了Java开发和运行所需的命令行工具，如`javac`（Java编译器）、`java`（Java虚拟机）和`jar`（归档工具）等。
- **conf** 目录：通常包含一些配置文件，如`java.security`用于定义安全策略。
- **include** 目录：包含用于本地方法接口（JNI）的头文件。
- **jmods** 目录：存储了模块描述文件，用于模块化的Java应用程序。
- **lib** 目录：包含各种库文件，如类库和JNI库。
- **legal** 目录：包含了相关的许可和版权信息。
- **man** 目录：存放man页，提供了命令的帮助信息。
安装JDK 11时，通常会将其路径添加到系统的PATH环境变量中，以便于在任何地方都能访问到Java工具。对于Linux系统，这通常涉及修改`~/.bashrc`或`~/.bash_profile`文件，然后重新加载配置。
`jdk-11.0.18-linux-aarch64-bin.tar.gz`是一个专门为ARM64架构设计的JDK版本，为基于Linux的64位ARM设备提供了完整的Java开发和运行环境。了解这些特性有助于开发者充分利用JDK 11的功能，进行高效且可靠的Java程序开发。
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