jdk1.4绿色免安装版
**Java Development Kit (JDK) 1.4 绿色免安装版详解**
JDK（Java Development Kit）是Oracle公司发布的用于开发Java应用程序的工具集，它包含了Java编译器、Java虚拟机（JVM）、Java类库以及一系列用于调试、性能分析和其他辅助开发的工具。JDK 1.4版本是Java历史上的一个重要里程碑，发布于2002年，它是Java 2 Platform Standard Edition (J2SE) 的一部分。
**1. JDK 1.4 版本特性**
1. **正则表达式（Regular Expressions）**: JDK 1.4引入了对正则表达式的全面支持，通过`java.util.regex`包提供了强大的文本处理功能，开发者可以更方便地进行字符串匹配和替换操作。
2. **NIO（New I/O）**: 新的I/O API，也称为非阻塞I/O，位于`java.nio`包中，为高性能、低延迟的I/O操作提供了新的选择，特别适合网络编程和大文件处理。
3. **异常链（Exception Chaining）**: 异常链允许一个异常捕获另一个异常，并将其作为原因（cause）包含在内，提供了更好的错误跟踪和诊断信息。
4. **自动装箱与拆箱（Autoboxing and Unboxing）**: 自动装箱使得基本类型与对应的包装类之间可以无缝转换，减少了手动装箱和拆箱的繁琐操作。
5. ** assert 关键字**: `assert`关键字用于编写单元测试，帮助开发者验证代码的正确性，只有在启动Java虚拟机时启用断言，它们才会生效。
6. **改进的集合框架**: JDK 1.4对集合框架进行了增强，包括`Set`、`List`和`Map`接口的实现，如`TreeSet`、`TreeMap`等，提高了性能和易用性。
7. **改进的并发编程工具**: `java.util.concurrent`包首次引入，提供了线程池、并发容器和同步原语，如`ExecutorService`、`Semaphore`和`Future`，简化了多线程编程。
8. **国际化增强**: 对多语言和区域支持进行了增强，如`java.text`包中的`Collator`和`DateFormat`，使程序能更好地适应不同国家和地区的文化习惯。
**2. 绿色免安装版**
“绿色版”或“免安装版”的JDK是指不需要经过复杂的安装过程，只需解压到任意目录即可使用的版本。这种版本通常便于携带和部署，特别是在不具有管理员权限的环境下，或者在需要快速搭建开发环境时非常实用。绿色版JDK通常包含以下组件：
- Java编译器（javac）
- Java解释器（java）
- Java运行时环境（JRE）
- 开发工具（如javadoc、jar等）
- 配置文件和库
在使用JDK 1.4绿色版时，只需将解压后的文件夹添加到系统的PATH环境变量中，确保系统可以找到所需的可执行文件，然后就可以开始编写和运行Java程序了。
总结，JDK 1.4绿色免安装版是一个便捷的开发工具，尽管已经有些许年代，但它仍能在旧的项目或特定环境中发挥价值，特别是对于需要兼容旧代码或研究历史版本特性的开发者来说，是一个不可或缺的资源。同时，其引入的许多新特性也为后续的Java版本奠定了基础，对整个Java生态产生了深远的影响。
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