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This undefined is spam This undefined is offensive This undefined is off-topic This undefined is other Submit ## Table of contents 1. [Command Line Arguments in Java](https://www.digitalocean.com/community/tutorials/command-line-arguments-in-java#command-line-arguments-in-java) 2. [How to Pass Command Line Arguments in Eclipse](https://www.digitalocean.com/community/tutorials/command-line-arguments-in-java#how-to-pass-command-line-arguments-in-eclipse) 3. [Conclusion](https://www.digitalocean.com/community/tutorials/command-line-arguments-in-java#conclusion) 1. [Tutorials](https://www.digitalocean.com/community/tutorials?subtype=tutorial) 2. [Java](https://www.digitalocean.com/community/tags/java) 3. Command Line Arguments in Java [Tutorial](https://www.digitalocean.com/community/tutorials?subtype=tutorial) # Command Line Arguments in Java Published on August 3, 2022 [Java](https://www.digitalocean.com/community/tags/java)  By [Pankaj Kumar](https://www.digitalocean.com/community/users/pankajkumarjournaldev)  Table of contents Popular topics Command-line arguments in Java are used to pass arguments to the main program. If you look at the [Java main method](https://www.digitalocean.com/community/tutorials/public-static-void-main-string-args-java-main-method) syntax, it accepts [String array](https://www.digitalocean.com/community/tutorials/java-string-array) as an argument. When we pass command-line arguments, they are treated as strings and passed to the main function in the string array argument. The arguments have to be passed as space-separated values. We can pass strings and primitive data types as command-line arguments. The arguments will be converted to strings and passed into the main method string array argument. ## [Command Line Arguments in Java](https://www.digitalocean.com/community/tutorials/command-line-arguments-in-java#command-line-arguments-in-java) Let’s say we have a simple java class to print command line arguments values. ``` package com.journaldev.examples; public class CommandLineArguments { public static void main(String[] args) { System.out.println("Number of Command Line Argument = "+args.length); for(int i = 0; i< args.length; i++) { System.out.println(String.format("Command Line Argument %d is %s", i, args[i])); } } } ``` If we run this class without any arguments, the output will be as follows. ``` $ java com/journaldev/examples/CommandLineArguments.java Number of Command Line Argument = 0 ``` Now, let’s pass some arguments to the main class. We have to pass the arguments as space-separated values. ``` $ java com/journaldev/examples/CommandLineArguments.java "A" "B" "C" Number of Command Line Argument = 3 Command Line Argument 0 is A Command Line Argument 1 is B Command Line Argument 2 is C $ java com/journaldev/examples/CommandLineArguments.java 1 2 3 Number of Command Line Argument = 3 Command Line Argument 0 is 1 Command Line Argument 1 is 2 Command Line Argument 2 is 3 $ ``` **Note**: If you are using [Java 11](https://www.digitalocean.com/community/tutorials/java-11-features) or higher, you don’t need to compile the java source file explicitly. The java command will compile and run the class simultaneously. ## [How to Pass Command Line Arguments in Eclipse](https://www.digitalocean.com/community/tutorials/command-line-arguments-in-java#how-to-pass-command-line-arguments-in-eclipse) We can also pass command-line arguments to a program in Eclipse using Run Configurations. #### Step 1: Open the Class Run Configurations Settings From the class editor, right click and chose “Run As” -\> “Run Configurations…”.  Eclipse Run Configurations #### Step 2: Specify the Program Arguments in the Arguments Tab In the pop up window, click on the Arguments tab. Then provide the command line arguments value in the “Program Arguments” text box.  Eclipse Command Line Arguments #### Step 3: Click on the Run button When you will click on the Run button, the run configurations will be saved and the program will execute with the specified command-line arguments.  Eclipse Command Line Arguments Example If you run the class again, the saved run configuration will be used. So if you want to override the command-line arguments or remove them, you will have to open the run configurations window and make necessary changes. ## [Conclusion](https://www.digitalocean.com/community/tutorials/command-line-arguments-in-java#conclusion) The command-line arguments are used to provide values that are essential to run the program. For example, we can specify the database credentials to be used by the program. We can specify the configuration file location from where the program should pick the required values. Reference: [Command-Line Arguments Oracle Docs](https://docs.oracle.com/javase/tutorial/essential/environment/cmdLineArgs.html) Thanks for learning with the DigitalOcean Community. Check out our offerings for compute, storage, networking, and managed databases. [Learn more about our products](https://www.digitalocean.com/products "Learn more about our products") ### About the author  Pankaj Kumar Author [See author profile](https://www.digitalocean.com/community/users/pankajkumarjournaldev) Java and Python Developer for 20+ years, Open Source Enthusiast, Founder of https://www.askpython.com/, https://www.linuxfordevices.com/, and JournalDev.com (acquired by DigitalOcean). Passionate about writing technical articles and sharing knowledge with others. Love Java, Python, Unix and related technologies. Follow my X @PankajWebDev [See author profile](https://www.digitalocean.com/community/users/pankajkumarjournaldev) Category: [Tutorial](https://www.digitalocean.com/community/tutorials?subtype=tutorial) Tags: [Java](https://www.digitalocean.com/community/tags/java) While we believe that this content benefits our community, we have not yet thoroughly reviewed it. If you have any suggestions for improvements, please let us know by clicking the “report an issue“ button at the bottom of the tutorial. #### Still looking for an answer? [Ask a question](https://www.digitalocean.com/community/questions)[Search for more help](https://www.digitalocean.com/community) Was this helpful? Yes No Comments(2) Follow-up questions(0)  [JournalDev](https://www.digitalocean.com/community/users/journaldev) [March 31, 2020](https://www.digitalocean.com/community/tutorials/command-line-arguments-in-java?comment=183625) Show less Thank you! I love this post. That help me understand clearly\! \- Zanik  [JournalDev](https://www.digitalocean.com/community/users/journaldev) [June 26, 2020](https://www.digitalocean.com/community/tutorials/command-line-arguments-in-java?comment=183626) Show less I want the java program that takes 10 arguments as integer and find the maximum out of it \- Vishu [](https://creativecommons.org/licenses/by-nc-sa/4.0/)This work is licensed under a Creative Commons Attribution-NonCommercial- ShareAlike 4.0 International License. ## Deploy on DigitalOcean Click below to sign up for DigitalOcean's virtual machines, Databases, and AIML products. [Sign up](https://cloud.digitalocean.com/registrations/new?refcode=f6fcd01aaffb) ## Popular Topics 1. [AI/ML](https://www.digitalocean.com/community/tags/ai-ml) 2. [Ubuntu](https://www.digitalocean.com/community/tags/ubuntu) 3. [Linux Basics](https://www.digitalocean.com/community/tags/linux-basics) 4. [JavaScript](https://www.digitalocean.com/community/tags/javascript) 5. 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