On the Windows operating system, the Java Development Toolkit (JDK) is used to extract jar packages, because JDK provides the development environment and tools of Java language, including JAR commands, which can be used to operate and manage JAR files.

JAR(Java Archive) is a common file format on the Java platform, which can package multiple Java class files, resource files and other files into one file. JAR package is widely used in Java development, which can be used for code distribution, library management and project packaging.

The steps of extracting JAR package with JDK are as follows:

1. Open a command prompt (CMD) or a PowerShell window.

2. Switch to the bin directory under the JDK installation directory, for example: CD C: \ Program files \ Java \ JDK1.8.0 _ 271\ bin.

3. Use JAR command to extract jar package, such as jar -xf yourJarFile.jar

This command will unzip the yourJarFile.jar file and unzip the files in it to the current directory.

By using JDK to extract JAR package, you can easily obtain the file contents in JAR package and view, modify or copy it when necessary. In addition, JDK also provides other useful tools, such as javac compiler and java virtual machine, to facilitate developers to compile and run Java programs.

It should be noted that the installation and configuration of JDK is the premise of extracting jar package. JAR command can only run smoothly if JDK is installed and configured correctly. In addition, you need to pay attention to the path and file name of the JAR package to ensure that the command entered is correct.

Extended content: In addition to using JDK to decompress JAR packages, you can also use other tools, such as WinRAR, 7-Zip and other compression and decompression software to decompress JAR packages. These tools also provide similar functions, which can easily extract and manipulate files. However, as the official tool set of Java development, JDK pays more attention to Java development and debugging, so it is common and recommended to use JDK to extract JAR packages in Java development environment.