3] Run a Java or JAR file. Now when you double click on the JAR file, it will automatically run like how EXE files execute. If there is a problem with version, the file should inform you.

When you install Java, the Java JAR utility is installed as well. This utility can both create JAR files and open JAR files. To extract the contents of a JAR file to the filesystem with the Java JAR ...

In other words, a Java class that supports the SOLID open-closed principle will find use in originally un-envisioned scenarios, and be flexible enough to work with newly created classes, interfaces ...