openjdk1.8绿色免安装版
《OpenJDK 1.8 绿色免安装版详解》
OpenJDK，全称为Open Source Java Development Kit，是Java开发工具集的一种开源实现，它由Sun Microsystems公司发起并推动，现在由甲骨文公司（Oracle）进行维护。OpenJDK 1.8是Java语言的一个重要版本，其免安装版本对于开发者来说，具有极大的便利性，尤其是对于那些不希望在系统上安装额外软件或需要频繁切换Java环境的用户。
OpenJDK 1.8的免安装版本，如“java-1.8.0-openjdk-1.8.0.191-1.b12.redhat.windows.x86_64.zip”，是一个压缩包文件，内含了Java运行时环境（JRE）和Java开发工具集（JDK）的所有必要组件。这个版本无需通过传统的安装程序进行安装，只需解压即可使用，大大简化了部署过程。
OpenJDK 1.8的关键特性包括：
1. **Lambda表达式**：引入了函数式编程的概念，使得代码更加简洁和高效，尤其是在处理集合数据时。
2. **Stream API**：提供了对集合进行高效操作的新方法，支持序列化操作，可以进行过滤、映射和归约等操作。
3. **方法引用和构造器引用**：使得对象的方法和构造器可以直接用作函数参数，简化了代码。
4. **默认方法**：在接口中添加了默认方法，允许接口扩展已有功能而不会破坏已有的实现。
5. **改进的类型推断**：编译器能够更准确地推断泛型的类型，减少了类型转换的需要。
6. **新日期时间API**：替换旧的日期和时间API，提供了更为强大且易于使用的日期和时间处理功能。
7. **重复注解**：允许在同一个声明上使用相同的注解多次，增加了注解的灵活性。
8. **字符串重复**：`String`类新增了`repeat()`方法，用于快速创建重复的字符串。
9. **新的并发工具类**：例如`ForkJoinPool`和`CompletableFuture`，提高了多线程编程的效率和便利性。
10. **Compact Strings**：对字符串存储方式进行了优化，节省了内存空间。
在Windows x86_64平台上，OpenJDK 1.8的免安装版本包含了适用于64位系统的Java运行时环境和开发工具，用户解压后可以将`bin`目录添加到系统环境变量`PATH`中，即可在命令行中调用Java命令，如`java`, `javac`, `jar`等。
OpenJDK 1.8的绿色免安装版本为开发者提供了一种轻量级、便捷的Java开发和运行环境，尤其适合于测试、演示和临时使用Java环境的场合。用户可以根据自己的需求，选择适合的版本，享受Java 1.8带来的各种新特性和性能提升。
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