jdk11压缩包，解压后配置环境就可以用
Java Development Kit (JDK) 11是Java编程语言的一个重要版本，由Oracle公司发布，提供了许多新特性和改进。这个压缩包包含了JDK 11的所有必要组件，允许开发者在本地环境中运行、构建和调试Java应用程序。一旦解压并正确配置了环境变量，您就可以在您的计算机上开始使用JDK 11。
1. **环境配置**：
- **JAVA_HOME**: 你需要设置`JAVA_HOME`环境变量，指向JDK 11的安装目录。这通常是在系统路径变量中添加一个新的条目。
- **PATH**: 接着，更新`PATH`环境变量，包含`%JAVA_HOME%\bin`，使得命令行可以访问Java可执行文件，如`javac`（Java编译器）和`java`（Java虚拟机）。
- **CLASSPATH**: 虽然在JDK 9及更高版本中，大多数情况下默认已经处理了类路径，但在某些特殊情况下，你可能还需要配置`CLASSPATH`来指定库和类的位置。
2. **模块系统（Jigsaw）**：
- JDK 11引入了Java模块系统，也称为Project Jigsaw，它通过将Java平台划分为模块，增强了系统的模块化和可维护性。
3. **JDK内部子模块**：
- **jdk.internal.jvmstat**: 这个模块提供了JVM统计监测服务，用于获取关于JVM的性能数据。
- **java.management**: 提供了管理Java应用程序和Java平台的API，如监控和管理Java虚拟机和其他Java实体。
- **jdk.crypto.mscapi**: 提供了与Microsoft Cryptographic API (MSCAPI)的接口，用于加密操作。
- **jdk.jstatd**: 是一个JVM统计监测服务器，允许远程客户端连接并收集性能数据。
- **jdk.jdwp.agent**: 用于Java调试协议（JDWP）的代理，支持远程调试Java应用程序。
- **jdk.internal.le**: 与本地事件（LE）相关的内部模块，可能涉及操作系统事件处理。
- **jdk.naming.ldap**: 为LDAP（轻量级目录访问协议）提供命名和目录服务支持。
- **jdk.jlink**: 工具集，用于创建定制的、最小化的Java运行时图像，减少应用程序启动时间和体积。
- **jdk.scripting.nashorn.shell**: Nashorn JavaScript引擎的shell，允许在Java环境中执行JavaScript代码。
- **jdk.crypto.ec**: 支持椭圆曲线加密算法的模块。
4. **新特性**：
- **HTTP客户端API**：JDK 11正式引入了`java.net.http`包，提供了一个内置的HTTP/2客户端，简化了网络通信。
- **动态类型语言支持**：Nashorn JavaScript引擎的增强，允许更深入地集成Java与JavaScript。
- **文本块**：新的语法特性，方便处理多行字符串。
- **强类型模式匹配**：在`instanceof`操作符中引入模式匹配，提高了代码的清晰度和安全性。
5. **其他改进**：
- 性能优化：包括垃圾回收、内存管理和编译器的改进。
- 安全强化：更新和增强安全协议，修复漏洞。
- 核心库扩展：添加了新的API和类，例如对HTTP/2的支持。
配置完成后，你可以通过`java -version`命令检查Java版本，确保一切设置正确。使用JDK 11开发Java应用时，还可以利用这些新特性来提高代码质量和效率。在实际开发中，了解这些组件和特性对于高效地利用JDK 11至关重要。
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