Java Development Kit (JDK) is a software development platform that provides the tools, libraries, and documentation needed to develop applications that run on the Java platform. The JDK has undergone several major versions since its first release.
JDK 1.0, also known as OAK (Oracle Application Server Kits), was released in 1996. It introduced features such as class libraries, compiler, and runtime environment that allowed developers to write and run Java programs.
JDK 1.1, also known as TIGER (Tiger), was released in 1998. It introduced features such as garbage collection (which automatically manages memory allocation and deallocation), security enhancements, and support for dynamic class loading.
JDK 1.2, also known as PUMPKIN (Pumpkin), was released in 1999. It introduced features such as support for JSP (JavaServer Pages), Java Servlets, and XML (Extensible Markup Language). These tools enabled developers to create dynamic web applications.
JDK 1.3, also known as THRIFT (Thrift), was released in 2000. It introduced features such as放宽运算符、枚举类型及自动装箱等，并且修复了许多bug。
JDK 1.4, also known as JAGUAR (Jaguar), was released in 2001. It introduced features such as support for Java Servlet API 2.2, Java Bean introspection, and native method interface.
JDK 1.5, also known as TIGER (Tiger) or JDK 5.0, was released in 2003. It introduced features such as lambda expressions、集合框架、注解等，极大地提升了开发效率，并且更加方便地处理大量数据。
JDK 6.0，代号为Mustang（野马），于2006年发布。它引入了面向对象编程语言中最重要的特性之一：静态内部类，并对内存管理进行优化。
JDK 7.0，代号为Dolphin（海豚），于2009年发布。它引入了更高效的垃圾回收器、即时编译器、并行执行等新技术，进一步提升了性能。
以上是JDK版本的简要发展历程，随着技术的发展和需求的变化，未来版本可能会带来更多创新和功能改进。
JDK 1.0, also known as OAK (Oracle Application Server Kits), was released in 1996. It introduced features such as class libraries, compiler, and runtime environment that allowed developers to write and run Java programs.
JDK 1.1, also known as TIGER (Tiger), was released in 1998. It introduced features such as garbage collection (which automatically manages memory allocation and deallocation), security enhancements, and support for dynamic class loading.
JDK 1.2, also known as PUMPKIN (Pumpkin), was released in 1999. It introduced features such as support for JSP (JavaServer Pages), Java Servlets, and XML (Extensible Markup Language). These tools enabled developers to create dynamic web applications.
JDK 1.3, also known as THRIFT (Thrift), was released in 2000. It introduced features such as放宽运算符、枚举类型及自动装箱等，并且修复了许多bug。
JDK 1.4, also known as JAGUAR (Jaguar), was released in 2001. It introduced features such as support for Java Servlet API 2.2, Java Bean introspection, and native method interface.
JDK 1.5, also known as TIGER (Tiger) or JDK 5.0, was released in 2003. It introduced features such as lambda expressions、集合框架、注解等，极大地提升了开发效率，并且更加方便地处理大量数据。
JDK 6.0，代号为Mustang（野马），于2006年发布。它引入了面向对象编程语言中最重要的特性之一：静态内部类，并对内存管理进行优化。
JDK 7.0，代号为Dolphin（海豚），于2009年发布。它引入了更高效的垃圾回收器、即时编译器、并行执行等新技术，进一步提升了性能。
以上是JDK版本的简要发展历程，随着技术的发展和需求的变化，未来版本可能会带来更多创新和功能改进。