how to create a file in classpath in java

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Subscribe. How to Set Classpath When Class Files are in .jar file in Java? We can illustrate the Java command example to add multiple JAR into classpath using Java 6 wildcard method as follows. It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions. The wizard may show you a Welcome page, you can disable this via the _"Show the welcome page the next time the wizard appears" flag. README.md . Convert a String to Character Array in Java, Java Program to Extract Content From a XML Document, Java Program to Sort the Array Elements in Descending Order. Basically, it will be the class of the .class file of our code. 8. So to load the file from the name itself using classpath is done by combining all the above-discussed method. To read any file from the classpath in a class, we have to get the reference of the system classloader for that class that is trying to read the file. These methods generally return the URLs and input streams respectively. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Difficulty Level : Medium Last Updated : 11 Feb, 2021 Read Discuss Courses Practice Video Classpath is a parameter in JVM or the java compiler that specifies the location of the user - defined classes as well as the packages. Is Java "pass-by-reference" or "pass-by-value"? Henceforth, we can deduce that its a good place to include all JAR files required by Java Application. This feature is released as part of Java Extension Pack. In below example, we set classpath to "build.classpath" using path element. For example, there can be two classes with the name Employee in two packages, college.staff.cse.Employee and college.staff.ee.Employee, Making searching/locating and usage of classes, interfaces, enumerations, and annotations easier. CLASSPATH describes the location where all the required files are available which are used in the application. The order in which you specify multiple classpath entries is important. This file initially contains two fields relating to the manifest version and the JDK version. Once we have the File reference, we can use a number of ways to read the file. Read File From Classpath in Java As mentioned above there are two methods, one is obj.getClass ().getClassLoader ().getResourceAsStream () and the other is obj.getClass ().getClassLoader ().getResource (). An application or system class loader loads our own files in the classpath. Click the Advanced system settings link (a pop-up box will open). This tutorial demonstrates how to read a file from classpath in Java. Click. // creating object of the class for getClass method, Reading the file delftstack.txt from classpath. Open the Project Properties Dialog. To add a classpath variable to the Java build path of a project, follow these steps: Select the project to which you want to add the classpath variable From the project's pop-up menu, select Properties In the Properties page, select the Java Build Path page. How to Create Jar File for Java Project in Eclipse? It can also be used as an archiving tool but the main intention to use this file for development is that the Java applets and their components(.class files) can be easily downloaded to a client browser in just one single HTTP request, rather than establishing a new connection for just one thing. For example, if the JAR file to be loaded is in the same directory as your calling JAR file, you could use the following: A manifest file allows developers to describe information relating to files in their JAR archive. Making statements based on opinion; back them up with references or personal experience. How to add an element to an Array in Java? How to Add JAR file to Classpath in Java? Replied on December 15, 2018. Reading a resource file from within jar. The paths should begin with the letter specifying the drive, for example, C:\. Issue an export command for CLASSPATH and specify the directories where you have stored the Java runtime libraries (from the PATH statement), the Java help files, and the OSA/SF GUI code that you transferred. encodeToString (cipherText) To decrypt we need to pass the cipherText to the doFinal method of the Cipher instance byte [] decryptedText = cipher. In order for you to be able to execute different applications, you'll need to either create a "manager" as you suggest, or to use the classpath instead: java -cp myjar.jar MyClass. I'm trying to create a MultipartFile from it: You are not passing the image data to the file!! Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Finally, run java -jar target/app1-. is the default value of CLASSPATH in the above command. So here we are taking getting absolute classpath using classLoader() method. This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. The Java interpreter will look for classes in the directories in the order they appear in the classpath variable. In other cases, its not available to all Java program which runs on the same host. Add CLASSPATH as variable name and path of files as a variable value. The code above uses the getResourceAsStream method to get the inputstream and then read the file from the classpath with the help of BufferedReader. You can also add an entry for your desired header:value pair. How is CompileTime classpath different from RunTime classpath in Java? Manage Settings Such that when we call the below command as follows: This package provides for system input and output through data streams, serialization, and the file system. How to install Jupyter Notebook on Windows? To add a JAR file for use in Informatica Analyst and Developer client tools (for Java transformation), do either of the following steps: Set the INFA_JAVA_OPTS environment variable to include the classpath using -cp . Well specify only the directory dir in our classpath variable, as the rest information regarding the path is provided by the import statements. Rather than trying to address the resource as a File just ask the ClassLoader to return an InputStream for the resource instead via getResourceAsStream: try (InputStream in = getClass ().getResourceAsStream ("/file.txt"); BufferedReader reader = new BufferedReader (new InputStreamReader (in))) {. The .classpathmaintains the project's source and target references for Java compilation and compressed file or project dependencies. ". How to setup Anaconda path to environment variable ? Java.util.jar.JarInputStream class in Java. To review, open the file in an editor that reveals hidden Unicode characters. After getting the file we have to read its content, so we will be performing a read operation on them. i want to write a file in the directory, where my main.class also is. To do so, simply use the delimiter for your operating system (either ; or :) as a separator between the locations specified for the CLASSPATH. Link for MODULEPATH example. How to Install OpenCV for Python on Windows? To set CLASSPATH environment variable, find the location of user environment variables in your machine and add all paths where Jar files are stored. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, Why specifically here? CLASSPATH environment variable is not case-sensitive. e.g. Save the JavaStage.config file on the InfoSphere Information Server engine . If you would like to change your settings or withdraw consent at any time, the link to do so is in our privacy policy accessible from our home page.. These two JAR files are in the same directory. Q&A for work. For example, you might issue the following command with these definitions: substituting the actual full path of the folder containing your jar files for absolutepath.. Then, after re-loading the shell (or running the bash command), you should be able to type junitr hw1.SomeDataStructureTest into the shell (from wherever your class files are) and it will run JUnit!. How to Install and Set up Android Studio on Windows? UPDATE: How is CompileTime classpath different from RunTime classpath in Java? For a .jar or .zip file that contains .class files, the class path ends with the name of the .zip or .jar file. Check the Project Structure dialog / Artifacts / the W web artifact, make sure R compiler output is included. Providing controlled access: protected and default have package level access control. As a best practice, always organize all JAR files and application classes inside one root folder. This compensation may impact how and where products appear on this site including, for example, the order in which they appear. after that create new file as: File txtFile=new File (file,"myText.txt"); Share Follow answered Oct 29, 2014 at 22:57 AsSiDe 1,826 2 15 24 Add a comment Click the Applybutton, then the OKbutton. How to install requests in Python - For windows, linux, mac. For example, here is a typical manifest files contents: The default manifest is always located in the path META-INF/MANIFEST.MF of your JAR file. These cold, mechanical files are the ones the computer likes read. Why are non-Western countries siding with China in the UN? Developer.com features tutorials, news, and how-tos focused on topics relevant to software engineers, web developers, programmers, and product managers of development teams. To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. Step 1: Click on the Windows button and choose Control Panel. A Computer Science portal for geeks. It makes the Menu class available in the package org.company to our current class. In Windows 10, we can directly search "environment variable" from taskbar search icon. You can make a similar alias to compile your junit files before runnning (it doesn't hurt to include . Authentication Bypass using SQL Injection on Login Page. Your class may very well reside in a read-only JAR file. Java Classpath separators are OS specific.Windows ; [Semicolon]Linux/Unix : [Colon]. There are mainly two ways to load resources and perform operations on them. In the included or excluded pattern window, choose excluded (If that's what you want) and add a pattern. During runtime of any Java application, the CLASSPATH is a parameter that tells the JVM where to look for classes and packages. Directories and jars are directly put in the CLASSPATH variable. Could very old employee stock options still be accessible and viable? Is email scraping still a thing for spammers. 7. Therefore, we can say that Class-Path is given the highest priority and it overrides the CLASSPATH environment variable as well as classpath command-line option. To add all JAR files present in a directory, use wildcard character ('*'). Convert a String to Character Array in Java, Java Program to Replace All Line Breaks from Strings, Java Program to Create ArrayList From Enumeration. If your application uses file I/O, you will want to learn about the powerful features of this class. On the Libraries tab, click Add Variable for adding a variable that refers to a JAR file. You can create an executable jar file in Java by two ways either provide a self created Manifest file or specify entry point using "-e" jar option. Continue with Recommended Cookies. How to Convert java.sql.Date to java.util.Date in Java? From Java 1.6+ onwards we can use a wildcard for including all jars in a directory to set classpath or else to provide Java program using classpath command-line option. read file from disk spring. Full and Relative Paths 1. Open the file in a text editor, and specify the class path definition in the following format: classpath:user_class_name = classpath_definition. You can't write in this stream, it is an InputStream. Dealing with hard questions during a software developer interview. To define your applications entry point, use the Main-Class header. JAR from ext directory can be loaded by extension Classloader. Connect and share knowledge within a single location that is structured and easy to search. Generally you can't write to the classpath. Weapon damage assessment, or What hell have I unleashed? . Here we will be discussing the responsibility of the CLASSPATH environment variable while programming in Java as we move forward we for sure short need usage of importing statements. For .class files in an unnamed package, the class path ends with the directory that contains the .class files. He has 7 years of Software Development experience in AI, Web, Database, and Desktop technologies. How to Install Jupyter Notebook on MacOS? rev2023.3.1.43266. The file can be present at the root of classpath location or in any relative sub-directory. Use the following command to set the classpath for different requirements. How to Add JAR file to Classpath in Java? 2022 TechnologyAdvice. Resources are the collections of files or images or stuff of other formats. To read this file, you must use getResourceAsStream (as detailed in this this SO question). During application runtime, application class loader will always scan the jar files and classes at specified paths in this variable. With the set command, its important to omit spaces from around the equals sign (=). Is quantile regression a maximum likelihood method? It can be either Classpath or classpath which is similar to PATH environment variable which we can use to locate Java binaries like javaw and java command. By using our site, you How do I create a Java string from the contents of a file? Extension class loaders load classes that are an extension of the standard core Java classes. A list of all Jars included in the project will be listed. The executable Jar file format only allows you to specify one main class. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Step 4: If the CLASSPATH already exists in System Variables, click on the Edit button then put a semicolon (;) at the end. We can use the -cp option to ensure that our jar file is in the classpath and then provide our main class in the package.className format: java -cp JarExample.jar com.baeldung.jar.JarExample Using path separators instead of package format also works: java -cp JarExample.jar com/baeldung/jar/JarExample 6.3. the file object represent the directory where your main.class file is located at runtime. Let's start by using the Files.createFile () method from the Java NIO package: @Test public void givenUsingNio_whenCreatingFile_thenCorrect() throws IOException { Path newFilePath = Paths.get (FILE_NAME); Files.createFile (newFilePath); } As you can see the code is still very simple; we're now using the new Path interface instead of the old File. First letter in argument of "\affil" not being output if the first letter is "L", "settled in as a Washingtonian" in Andrew's Brain by E. L. Doctorow. These methods can get the stream or URL or the corresponding file and then read the file. I'm trying to create a MultipartFile from it, The open-source game engine youve been waiting for: Godot (Ep. Difference Between Path and ClassPath in Java, Difference Between java.sql.Time, java.sql.Timestamp and java.sql.Date in Java, Program to Convert Set of Integer to Set of String in Java. The classpath of an application generally contains the following locations: If the file is present inside a jar file, add the jar file to the projects lib folder or add the jar in the projects classpath. One must have an absolutely clear understanding of it. The consent submitted will only be used for data processing originating from this website. Select the JAR file and click edit button. Different Ways to Set a Classpath in Java, Difference Between Path and ClassPath in Java, Fresco Image Loading Library in Android with Example, Java SE 9 : Improved try-with-resources statements. Creating and Executing a .jar File in Linux Terminal, Java.util.jar.JarInputStream class in Java. Methods: JAR file can be added in a classpath in two different ways, Step 4: Click on libraries and click on Add External JARs, Step 5: Select the jar file from the folder where you have saved your jar file, Command 1: By including JAR name in CLASSPATH environment variable. In other words, this is the classpath passed to "javac". The method returns a boolean value: true, if the file created successfully. root directory paths and full paths. For example, we can load a file from any resource directory and will be then able to read the content of that file. The open-source game engine youve been waiting for: Godot (Ep. Java Compiler and JVM (Java Virtual Machine) use CLASSPATH to locate the required files. JAR files are sometimes used to package Java applications. Asking for help, clarification, or responding to other answers. Java How to set classpath in Windows 7, 8, 10Java Set classpath from the command line. In addition to covering the most popular programming languages today, we publish reviews and round-ups of developer tools that help devs reduce the time and money spent developing, maintaining, and debugging their applications. Using predefined class name as Class or Variable name in Java, 7 Tips to Become a Better Java Programmer in 2023, StringBuffer appendCodePoint() Method in Java with Examples. JAR is an abbreviation of JAVA Archive. A default member (without any access specifier) is accessible by classes in the same package only. To create a file in Java, you can use the createNewFile() method. Select System and Security 4. To create a directory, we need to use mkdir () or Files.createDirectory (): boolean result = file .mkdir (); File newPath = Files.createDirectory (path); There are additional variants of those methods to include all non-existing subdirectories, via the mkdirs () and Files.createDirectories () methods: Developers can either modify a manifest file manually or by using the m option at the creation of a JAR file. Method 1: Setting CLASSPATH as a command line. Select OK. Set the CLASSPATH on Linux Command Line: document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); document.getElementById( "ak_js_2" ).setAttribute( "value", ( new Date() ).getTime() ); HowToDoInJava provides tutorials and how-to guides on Java and related technologies. We will be using obj.getClass().getClassLoader().getResourceAsStream() and obj.getClass().getClassLoader().getResource() methods to get the stream and URL of the file respectively and then perform the read operations on them. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. If URI is used as argument then it removes the protocol . In the section System Variables, find the CLASSPATH environment variable and select it. If your entry point is in a directory (say MyDirectory), then you can use the forward-slash / when specifying it in the command line: When packaging your applications, programmers may place different classes in several jar files. We can use the classpath option to set the classpath when calling a JDK tool (the recommended method) or by setting the CLASSPATH environment variable. In general you can't do this. To learn more, see our tips on writing great answers. If you provide external Manifest file than you need to use jar -m option to include that manifest file inside jar. ;c:/jars demo-application.jar. How to install Jupyter Notebook on Windows? To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Click Environment Variables. You can change the class path by using the -classpath or -cp option of some Java commands when you call the JVM or other JDK tools or by using the classpath environment variable. Each classpath should end with a filename or directory depending on what you are setting the classpath. Launching the CI/CD and R Collectives and community editing features for How to get the path of running java program. I would recommend our Apache friends FileUtils library (getting classpath as this answer): This method downloads the url, and save it to file f. Your issue is that "image.jpg" is a resource of your project. The system class loader only knows about the core Java libraries, for example, those in java.lang., java.util., etc. The file name can be given in two ways i.e. JAR wildcard is honored when we use cp or classpath option, Command 5: Adding JAR in ext directory example be it C:\Program Files\Java\jdk1.6.0\jre\lib\ext, By using the above method we can add multiple JAR in our classpath. The CLASSPATH variable is one way to tell applications, including the JDK tools, where to look for user classes. Below syntax examples will add more than one jar file in classpath. Setting the Classpath for the Windows Command Prompt To set the classpath for the Windows XP Command Prompt: Otherwise, the last entry will not be parsed properly. By using our site, you 542), We've added a "Necessary cookies only" option to the cookie consent popup. These methods are present in the java.lang.Class package. If String pathname is used to create File object, it simply returns the pathname argument. .classpath .project . We want to load classes in MyUtils.jar into the class path for use in MyJar.jar. How to Create Jar File for Java Project in Eclipse? Add all folders separated with separator. Command 4: By using Java 6 wildcard option to include multiple JAR. Connect and share knowledge within a single location that is structured and easy to search. Why do we kill some animals but not others? 2. Including all the jars in a directory within the Java classpath. Such that when we call the below command as follows: Menu menu = new Menu (); Example Java import java.io. How do I efficiently iterate over each entry in a Java Map? It also shares the best practices, algorithms & solutions and frequently asked interview questions. 1. Different Ways to Set a Classpath in Java, Loading Resources from Classpath in Java with Example. Set the CLASSPATH in /etc/environment using. How to Find the Wi-Fi Password Using CMD in Windows? He writes tutorials in Java, PHP, Python, GoLang, R, etc., to help beginners learn the field of Computer Science. We put directories and jars in the CLASSPATH variable. (dot) to include the current path in the classpath where the .class file has been generated. getFile ("data/data. This configuration is maintained through the Java Build Pathpage in the project's properties. Is quantile regression a maximum likelihood method? It has been given higher priority than application class loader which loads JAR from either CLASSPATH environment variable or else directories specified in classpath or cp. Manually modifying the file means directly adding entries to it. Command 3: By including the jar name in the Class-Path option in the manifest. How do I include a JavaScript file in another JavaScript file? Click Edit. java.io.File contains three methods for determining the file path, we will explore them in this tutorial. You also need to ensure that your text file ends with a new line character. One should know how to set a classpath if not done after configuring JDK in respecting operating systems in order to see it or to it and play with multiple IDE, versions game altogether. A .jar file is an archive of .class files (and other necessary resources) all neatly zipped up for convenience. How to Connect Two Computers with an Ethernet Cable? On them MultipartFile from it, the class path definition in the application resources and perform operations on....: click on the same directory paste this URL into your RSS reader / logo 2023 Exchange. On them specify only the directory, where developers & technologists share private knowledge with,. Load resources and perform operations on them this stream, it is an inputstream that tells the JVM where look! Added a `` Necessary cookies only '' option to the file delftstack.txt from classpath default value classpath. Reach developers & technologists worldwide application classes inside one root folder format only allows to. Specifically here is structured and easy to search to get the inputstream and then read the file delftstack.txt classpath! Order in which they appear to other answers Java compiler and JVM ( Java Virtual ). [ Semicolon ] Linux/Unix: [ Colon ] getting the file reference, we can use the createNewFile ( ;. Or stuff of other formats dealing with hard questions during a software interview... User contributions licensed under CC BY-SA able to read its content, so we will listed. Archive of.class files ( and other Necessary resources ) all neatly zipped up for.... By combining all the required files it: you are Setting the classpath variable, as the information... Classpath variable, as the rest information regarding the path is provided by the statements... In this variable write a file in a Java string from the classpath for different requirements are... Different ways to read a file in Java class available in the project & # x27 ; s.... Within a single location that is structured and easy to search jars are directly put in the same.. File for Java project in Eclipse file to classpath in the classpath is by... File reference, we can load a file in Java fields relating to the file path, can. That When we call the below command as follows: Menu Menu = new Menu ( ).... Order in which you specify multiple classpath entries is important as the information. Runtime of any Java application present at the root of classpath in Java, why specifically?... To it classpath from the classpath import statements option in the same host.zip file that contains.class (! A JavaScript file Set classpath from the command line have package level access control in Terminal... S source and target references for Java project in Eclipse Exchange Inc ; user licensed... Classpath When class files are in the Class-Path option in the order how to create a file in classpath in java.... We Set classpath from the command line Advanced system settings link ( pop-up. Adding entries to it taking getting absolute classpath using classLoader ( ).... Also add an entry for your desired header: value pair is included '' option to include multiple JAR classes... I want to write a file in Java [ Semicolon ] Linux/Unix [... It is an archive of.class files, the order they appear to tell applications, including the tools... Have package level access control search icon than one JAR file format only allows you to one... Passing the image data to the file path, we 've added a `` Necessary cookies only option. Default member ( without any access specifier ) is accessible by classes in MyUtils.jar into the class path with. Character ( ' * ' ) very old employee stock options still be and... Default have package level access control above-discussed method that are an extension of the standard Java. And community editing features for how to connect two Computers with an Cable! Done by combining all the above-discussed method.jar file Build Pathpage in classpath., where developers & technologists worldwide, why specifically here to connect two Computers with Ethernet. Locate the required files are in.jar file input streams respectively example, those in java.lang., java.util. etc! Package only: Godot ( Ep for adding a variable value boolean value: true, the. Command example to add multiple JAR basically, it is an archive of.class files the. Created successfully means directly adding entries to it method to get the inputstream and then read the of! Pass-By-Reference '' or `` pass-by-value '', find the classpath variable by including the JDK version returns a boolean:... Similar alias to compile your junit files before runnning ( it doesn & # 92 ; tutorial demonstrates to... Access control reference, we can illustrate the Java classpath output is included organize all JAR files are sometimes to. Classpath variable is structured and easy to search: protected and default have package level control! Libraries, for example, C: & # x27 ; t hurt to include that manifest file JAR. Class path definition in the UN java.io.file contains three methods for determining the file means directly adding entries it... Or responding to other answers to Set the classpath part of Java extension.! Been waiting for: Godot ( Ep this compensation may impact how and where products appear on this including! ' * ' ) all jars included in the directory that contains.class... Dir in our classpath variable, we Set classpath to locate the required files are in.jar file in?! ] Linux/Unix: [ Colon ] select it RunTime classpath in Java with example different ways Set! Loader loads our own files in an editor that reveals hidden Unicode.! Classpath passed to & quot ; from taskbar search icon createNewFile ( ).... Default member ( without any access specifier ) is accessible by classes in the UN or... Each entry in a read-only JAR file to classpath in the directory dir in our classpath variable get. Accessible and viable pathname is used as argument then it removes the protocol Java applications an Array Java. And Executing a.jar file in an editor that reveals hidden Unicode characters, our! File created successfully data to the file! read the file reference we... Youve been waiting for: Godot ( Ep, as the rest information the... File delftstack.txt from classpath in Java true, if the file delftstack.txt from classpath in Java the above command get! In any relative sub-directory be given in two ways to read its content, so we explore... And Executing a.jar or.zip file that contains.class files ( =.... Your applications entry point, use wildcard character ( ' * ' ) name itself classpath... Wildcard option to include that manifest file inside JAR have to read file. Check the project & # x27 ; s properties you specify multiple classpath is! One way to tell applications, including the JAR files and application classes inside one root.. Java Libraries, for example, the order in which they appear in the?. Where developers & technologists share private knowledge with coworkers, Reach developers & worldwide. Given in two ways to read the content of that file our class. Its a good place to include multiple JAR to read this how to create a file in classpath in java initially contains two fields relating to the version! Consent submitted will only be used for data processing originating from this website using our,. Menu ( ) ; example Java import java.io a command line are the the! Java command example to add JAR file to classpath in Windows 7, 8, 10Java Set classpath When files... Ensure that your text file ends with the help of BufferedReader originating from this.. Where the.class files, the open-source game engine youve been waiting for: Godot Ep... Load the file can be given in two ways to read its content, we. Javac & quot ; which you specify multiple classpath entries is important similar alias to compile your junit files runnning. File, you will want to learn more, see our tips on writing answers. You can also add an entry for your desired header: value pair Linux/Unix [. Sign ( = ) at specified paths in this tutorial by the import statements be loaded by extension.... User classes file we have to read the file created successfully a best practice, always all. Path, we can deduce that its a good place to include multiple JAR different from RunTime in. I efficiently iterate over each entry in a directory, use the Main-Class.. That file the name of the standard core Java Libraries, for,! By the import statements to load resources and perform operations on them to ensure that your text ends...: [ Colon ] including all the required files are in the classpath variable. That are an extension of the standard core Java Libraries, for example, those java.lang.! The rest information regarding the path of running Java program Array in Java CompileTime different! Dialog / Artifacts / the W web artifact, make sure R compiler output included. A classpath in Windows be used for data processing originating from this website project in Eclipse entry,. Application class loader loads our own files in the directories in how to create a file in classpath in java classpath variable, as the rest information the... Practice, always organize all JAR files are available which are used in the same package.... Statements based on opinion ; back them up with references or personal experience two JAR files and application classes one. Game engine youve been waiting for: Godot ( Ep I create a MultipartFile from it, the order which... ; environment variable & quot ; javac & quot ; from taskbar icon... Is used to create a file from the command line this this so question ) be listed or compiled than! I/O, you can use a number of ways to Set classpath in Java with example paste this URL your!

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how to create a file in classpath in java