Usually, if you only care about running Java programs on computer you will only install the JRE. It is capable of creating and compiling programs. It has everything the JRE has, but also the compiler (javac) and tools (like javadoc and jdb). The JDK is the Java Development Kit, the full-featured SDK for Java. However, it cannot be used to create new programs. It is a package of everything necessary to run a compiled Java program, including the Java Virtual Machine (JVM), the Java Class Library, the java command, and other infrastructure. Contains everything required to run Java applications on your system.
The JRE is the Java Runtime Environment, it covers most end-users needs. Installing this update will ensure that your Java applications continue to run as safely and efficiently as always. It integrates right into the Windows system & also has a CMD/DOS command line option.It's also integral to the intranet applications and other e-business solutions that are the foundation of corporate computing. JAR_Runner locates the current Java installation, calls the appropriate application (JavaW.exe), & directs it to run the JAR file. Even if one knows how to do all this, it can be a bit of a hassle to do each time one wishes to load a JAR application. Luckily, Java's folder is most often added automatically to the default system path, and this helps us find where it is. Yet if a user does not happen to know either the command-line syntax or where the necessary files are, this already poses a bit of a problem - especially since the folder in which Java is located is not always the same but often times reflects the specific version of that particular Java installation. Now certainly, the JAR file still needs Java to run. Yet, rest assured! The program likely still works!. So, users upgrading to 10 may suddenly find such programs are no longer loading. Also, later versions of Windows (currently, such as Windows 10) simply do not have JAR files associated with the current Java installation for whatever reason. For example, WinRAR (a popular compression/extraction utility) may be defaulted to open the JAR files as compressed archives - allowing one to view the contained files but providing no means by which to run them. Somewhere along the way however, this file association can be broken. In earlier versions of Windows & by default, JAR files were opened & run by the current Java installation.
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