JAR files (Java ARchive) allows aggregating many files into one, it is usually used to hold Java classes in a library. i.e. Math.jar
WAR files (Web Application aRchive) stores XML, java classes, and JavaServer pages for Web Application purposes.
EAR files (Enterprise ARchive) combines JAR and WAR files to make a combined archive for Enterprise Applications.
1))What is the difference between "path" and "classpath"? Ans:: We keep all "executable files"(like .exe files) and "batch files"(like .bat) in path variable. And we keep all jar files and class files in classpath variables. So path is set according to the .exe files & .bat files And classpath is set according to the .jar files & .class files. Operating system tries to find .exe and .bat files in path and JVM tries to find all classes in classpath.
The Java Servlet is like every other Java class. You can compile it using the javac command or if you are using a Integrated Development Environment (IDE) like Eclipse, it will compile the class for you. One main difference w.r.t Servlets is the fact that, they get deployed into EAR files (Enterprise Archive Files) and not JAR files (Java Archive Files) like normal java apps.
JAR file is Java Archive file where all classes and related meta information is stored. Basically this format is based or is plain ZIP archive.To launch application in JAR file:java -jar .jarTo extract files from JAR file:jar -xvf .jarIt is possible to create/extract using any other plain ZIP utility.
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