A Java Archive, or JAR file, contains all of the various components that make up a self-contained, executable Java application, deployable Java applet or, most commonly, a Java library to which any ...

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I installed java today and created the traditional hello world console application called first.java. I set the PATH stuff and whatnot, and the Sun tutorial says type in "javac first.java".

This is an undesirable program. This file has been identified as a program that is undesirable to have running on your computer. This consists of programs that are misleading, harmful, or undesirable.