Right from day one, the standard format for packaging Java programs was the Java ARchive, or JAR file for short. There's nothing particularly interesting about a JAR file. At its heart, it's simply a ...

Java archive files (JARs) let you import pre-coded libraries into your Android applications. JARs save time, because you can use the Java functions without writing your own code for certain processes.

Starting in April, Oracle will treat JAR files signed with the MD5 hashing algorithm as if they were unsigned, which means modern releases of the Java Runtime Environment (JRE) will block those JAR ...