How do you set core java class path?

What is classpath and path in java?

if you are using the IDE then there is no need to set class path, ant you are using Command prompt to run the java program then you need to set the class path where the class (which is going to be used in your program) is actually located,use the following command:set calsspath=%classpath%;actual_path_of the class;we cancall more than two class by using this command by using separator (,)

Why path and class-path in java?

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.

Why it is required to set path and classpath?

to compile and run java program you need to set path and classpath path refers to binary used to compile and run java program i.e. "javac" for compilation and "java" for execution

How do you set java environment variables?

You need to set The CLASSPATH variable which is an argument set on the command-line that tells the Java Virtual Machine where to look for user-defined classes and packages in Java programs. Syntax is java -classpath "path to the packages". Set the PATH variable if you want to be able to conveniently run the Java 2 SDK executables (javac.exe, java.exe, javadoc.exe, etc.) from any directory without having to type the full path of the command. To set the PATH permanently, add the full path of the j2sdk1.4.2_version\bin directory to the PATH variable. -sravyaa

How do you set path in java?

1. install JdK 2. include JDK_HOME/bin in your PATH environment variable

Why does java does not run on Linux?

the short answer is that it does. assuming you have java installed and your path set, it's as easy as javac javafilename.java java javafilename or if you have it as a jar file java -jar jarfilename.jar

How does you set the path of java progrramig?

In Windows:Copy the lib path of the java jdk from where it is installed.Open command promt.Type the following command.set CLASSPATH=Example:C:\>set classpath=C:\Java\jdk1.6.0_03\lib

My runescape Private server DOS batch file won't open?

This may be because you have not either installed your java properly or you haven't set the PATH of your java properly or just simply your java is out of date and needs updating.

What is Java Class Libraries?

The Java standard library refers to the set of dynamically loadable libraries that Java applications can call at run time. This is because the Java platform is not dependent on the specific operating system.

What are the two types of java?

Java is a programming language that has two main types: Java SE (Standard Edition): This is the core Java language that provides all the basic features and functionalities of Java. It includes the Java Virtual Machine (JVM), which is responsible for running Java programs, and the Java Development Kit (JDK), which is used for developing Java applications. Java EE (Enterprise Edition): This is a set of Java APIs (Application Programming Interfaces) and technologies that are used for developing large-scale, distributed, and enterprise-level applications. Java EE includes a variety of APIs such as Servlets, JSPs, EJBs, JPA, JMS, and many others. These APIs provide a rich set of features for developing complex and robust enterprise applications. For more information, please visit: 1stepGrow

Is there any difference between java and j2SE?

Core Java and J2SE are the same thing, which is the set of classes to be found in the rt.jar package. The classes were just given different names at different stages of the continued revisions to the Java Runtime Environment.

Write note on The class path environment variable?

CLASSPATH The CLASSPATHenvironment variable tells the Java Virtual Machine and other Java applications (for example, the Java tools located in the jdk1.1.x/bin directory) where to find the class libraries, including user-defined class libraries.SYNOPSISThe CLASSPATH environment variable is set with the setenvcommand. Using setenv at the command line changes the current value of CLASSPATH. You can also use setenv in your startup file to specify a CLASSPATH at startup. The format is: setenv CLASSPATH path1:path2 ... where a path to a .zip or .jar file must terminate with the filename, and a path to a .class file must terminate with the directory name. The Java interpreter will search the paths for a class by name and load the first one it finds. DESCRIPTIONThe CLASSPATH tells the Java Virtual Machine and other Java applications and tools where to find the class libraries. The class libraries that the CLASSPATH points to may be the JDK classes (contained in the classes.zip file in the lib directory) and/or any classes that you want to use. Default CLASSPATH settingIf you followed the default JDK installation procedure, you probably do not need to set CLASSPATH because the shell scripts automatically append the following to the current CLASSPATH: .:[bin]/../classes:[bin]/../lib/classes.zip In this expression, [bin] is the absolute path to the jdk1.1.x/bin directory. Therefore, if you keep the bin and lib directories at the same directory level, the Java executables will find the JDK classes (contained in the classes.zip file). Note that the default CLASSPATH also includes a path to a classes directory on the same directory level as bin and lib. You can put your own (unzipped) class files in a classes directory that you create, and the Java executables will be able to find them with the default CLASSPATH. You should also be aware that some third-party applications that use the Java Virtual Machine may modify your CLASSPATH environment variable.Setting CLASSPATHYou need to set the CLASSPATH if you move the JDK's classes.zip file or if you want to load a class library that's not in a location specified by the default CLASSPATH. To set CLASSPATH, use the setenv command.Classes can be saved either in individual class files, such as MyClass.class, or in groups in a file such as classes.zip or classes.jar. When specifying a path to a .zip or .jar file, you must end the path with the filename. When specifying a path to .class files, that path should end with the directory containing the .class files. For example, if you have class files in the directory /home/MyClasses, you could set the CLASSPATH with the following: setenv CLASSPATH /home/MyClasses If you also wanted to include the path /home/OtherClasses, you could use the command: setenv CLASSPATH /home/MyClasses:/home/OtherClasses Note that the two paths are separated by a colon.The order in which you specify multiple directories in the CLASSPATH variable is important. The Java interpreter will look for classes in the directories in the order they appear in the CLASSPATH variable. In the example above, the Java interpreter will first look for a needed class in the directory /home/MyClasses. Only if it doesn't find a class with the proper name in that directory will the interpreter look in the /home/OtherClasses directory.If you want to use a class library that is in a zipped file, you must include the name of that file in the CLASSPATH, for example: setenv CLASSPATH /home/MyClasses/myclasses.zipIf you want the CLASSPATH to point to class files that belong to a package, you should specify a path name that includes the path to the directory one level above the directory having the name of your package. For example, suppose you want the Java interpreter to be able to find classes in the package mypackage. If the path to the mypackage directory is /home/MyClasses/mypackage, you would set the CLASSPATH variable as follows: setenv CLASSPATH /home/MyClasses Unsetting CLASSPATHIf your CLASSPATH environment variable has been set to a value that is not correct, or if your startup file or script is setting an incorrect path, you can unset CLASSPATH by using: unsetenv CLASSPATH This command unsets only CLASSPATH's current value. You should also delete or modify the lines in your startup file that may be setting an incorrect CLASSPATH.The Java Runtime Environment (JRE) and CLASSPATHThe wrappers that invoke the Java Runtime Environment (JRE) unset the CLASSPATH variable before starting the Java interpreter. The reason is simple: there might be several Java applications installed on the machine. If you or someone else previously installed a Java development tool that modified the .cshrc or .login script, then CLASSPATH may point at a JDK1.0.2-based Java runtime. If such a CLASSPATH were left intact when the Java interpreter is invoked, then it will be loading 1.0.2 classes. If your app relies on 1.1 features, it will fail. Just as bad, it's unlikely that the classes for your app will even be found in that CLASSPATH. Unsetting CLASSPATH before invoking the JRE interpreter sanitizes your application against unpredictable results.The default CLASSPATH used by the JRE is: [jre_path]/lib/rt.jar:[jre_path]/lib/i18n.jar:[jre_path]/lib/classes.jar:[jre_path]/lib/classes.zip:[jre_path]/classes where [jre_path] is the absolute path of the jre1.1.x directory (it has bin and lib directories underneath it). The files rt.jar and i18n.jar are used to hold the runtime's (required) core classes and (optional) internationalization classes. While you can store the classes specific to your application in either [jre_path]/lib/classes.jar or as individual class files in the [jre_path]/classessubdirectory, it is better to keep the JRE separate from your application and use CLASSPATH to point the interpreter to your application's class files.Using both JDK 1.0.2 and JDK 1.1.xIf you want to develop in both JDK 1.0.2 and JDK 1.1.x, you must set CLASSPATH separately for each one. To use both JDKs simultaneously, you can run them from separate shell windows each having its own value for CLASSPATH. If you are running only one at a time, you can write a batch script to switch the value of CLASSPATH as appropriate.The Java tools' -classpath optionSome of the Java tools such as java, javac, and javah have a -classpath option which can be used to override the path or paths specified by the CLASSPATH environment variable.