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What is PATH and CLASSPATH in Java The PATH and CLASSPATH are two most important environment variables of Java environment which is used to find the JDK binaries used to compile and run Java in windows and Linux and class files which are compiled Java bytecodes. From my personal experience I can say that PATH and CLASSPATH are two most problematic thing for beginners in Java programming language due to two reasons; first because in most of Java courses nobody tell details of what is a PATH and CLASSPATH, What do PATH and CLASSPATH do, What is meaning of setting PATH and CLASSPATH, What happens if we do not set them, Difference between PATH vs CLASSPATH in Java or simply etc. These basic question which answers most of the details about PATH and CLASSPATH in Java are mostly not answered until Java programmer itself acquire these knowledge, Things may be changed nowadays but important of PATH and CLASSPATH is still high. Most common cause of dreaded error like and is either incorrect or misconfigured CLASSPATH in Java. In this article, I'll tell you about practical difference between PATH and CLASSPATH environment variable, where are they located and how exactly they are used by Java compiler and JVM. Once you know this basic detail, you would be able to solve most of the classpath related problem by yourself.

Difference between PATH and CLASSPATH in Java Here are some of the common difference between PATH vs CLASSPATH in Java: 1)The main difference between PATH and CLASSPATH is that PATH is an environment variable which is used to locate JDK binaries like ' java' or ' javac' command used to run java program and compile java source file. On the other hand, CLASSPATH, an environment variable is used by System or to locate and load compile Java bytecodes stored in the.class file. 2) In order to set PATH in Java, you need to include JDK_HOME/bin directory in PATH environment variable while in order to set CLASSPATH in Java you need to include all those directories where you have put either your.class file or JAR file which is required by your Java application. 3) Another significant difference between PATH and CLASSPATH is that PATH can not be overridden by any Java settings but CLASSPATH can be overridden by providing command line option -classpath or -cp to both ' java' and ' javac' commands or by using Class-Path attribute in Manifest file inside. 4) PATH environment variable is used by operating system to find any binary or command typed in the shell, this is true for both Windows and Linux environment while CLASSPATH is only used by Java ClassLoaders to load class files. These were some notable difference between PATH vs CLASSPATH in Java and they are worth remembering to debug and troubleshoot Java-related issues. Though, I highly recommend you to read by Cay S.

Horstmann to build your fundamentals in Java. Anonymous Create a class called Rectangle that includes two pieces of information as instance variables a length (type integer) and a breadth (type integer). Your class should have a constructor that initializes the two instance variables. Your class should also have two methods called calcArea and calcPerimeter which calculates the area and perimeter of the rectangle respectively and display their corresponding calculated values.

In this tutorial we will discuss how to install Java, setup JRE_HOME & JAVA_HOME environment variables on Windows platform only. For Mac and Linux, I’ll publish another tutorial with all detailed steps later.

Create the object of the Rectangle class and then call the calcArea method.