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curl -X POST \
  'http://laksa103.int.ahrefs:8124/' \
  -H 'Content-Type: text/plain' \
  -H 'X-ClickHouse-Database: crawler3' \
  -H 'Authorization: Basic YXBpOg==' \
  -d 'SELECT getAhrefsURLFromUnparsed(src_unparsed) AS found_url, ifNull(toUnixTimestamp(download_stamp), 0) AS crawl_time, ifNull(toUnixTimestamp(props_url_first_seen), 0) AS first_indexed_time, download_http_code AS http_code, src_unparsed AS src_unparsed, src_root_hash AS src_root_hash, history_drop_reason AS history_drop_reason, meta_title AS meta_title, meta_descriptions AS meta_descriptions, attrs_boilerpipe_text AS attrs_boilerpipe_text, attrs_markdown AS attrs_markdown, attrs_readable_markdown AS attrs_readable_markdown, meta_canonical AS meta_canonical FROM crawler3.page_info_local FINAL PREWHERE (src_root_hash, src_unparsed) IN ((getAhrefsRootHashFromUnparsed(getAhrefsUnparsedNoserviceFromURL(\'https://www.geeksforgeeks.org/java/command-line-arguments-in-java/\')), getAhrefsUnparsedNoserviceFromURL(\'https://www.geeksforgeeks.org/java/command-line-arguments-in-java/\'))) FORMAT JSONEachRow'

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{"found_url":"https:\/\/www.geeksforgeeks.org\/java\/command-line-arguments-in-java\/","crawl_time":1775779855,"first_indexed_time":1749777401,"http_code":200,"src_unparsed":"org,geeksforgeeks!www,\/java\/command-line-arguments-in-java\/ s443","src_root_hash":"12046344915360636903","history_drop_reason":null,"meta_title":"Command Line Arguments in Java - GeeksforGeeks","meta_descriptions":["Your All-in-One Learning Portal: GeeksforGeeks is a comprehensive educational platform that empowers learners across domains-spanning computer science and programming, school education, upskilling, commerce, software tools, competitive exams, and more.","Your All-in-One Learning Portal. It contains well written, well thought and well explained computer science and programming articles, quizzes and practice\/competitive programming\/company interview Questions."],"attrs_boilerpipe_text":"Last Updated :\n24 Mar, 2026\nJava command-line argument\n \nis an argument, i.e., passed at the time of running the Java program. Command-line arguments passed from the console can be received by the Java program and used as input.\nExample:\njava Geeks Hello World\nNote:\nHere, the words Hello and World are the command-line arguments.\nJVM will collect these words and will pass these arguments to the main method as an array of strings called args. The JVM passes these arguments to the program inside args[0] and args[1].\nExample\n: In this example, we are going to print a simple argument in the command line.\n\/\/ Java Program to Illustrate First Argument\nclass\nGFG\n{\npublic\nstatic\nvoid\nmain\n(\nString\n[]\nargs\n)\n{\n\/\/ Printing the first argument\nSystem\n.\nout\n.\nprintln\n(\nargs\n[\n0\n]\n);\n}\n}\nOutput:\nOutput of  first argument\nExplanation\n:\nRunning java GFG GeeksForGeeks prints GeeksForGeeks because the argument is passed to main(String[] args).\nIf no arguments are given (e.g., java GFG), it throws ArrayIndexOutOfBoundsException since args is empty.\nWhy Use Command Line Arguments?\nIt is used because it allows us to provide input at runtime without modifying the whole program.\nIt helps to run programs automatically by giving them the needed information from outside.\nWorking of Command-Line Arguments\nCommand-line arguments in Java are space-separated values passed to the main(String[] args) method.\nJVM wraps them into the args[] array, where each value is stored as a string (e.g., args[0], args[1], etc.).\nThe number of arguments can be checked using args.length.\nExample\n: Display Command-Line Arguments Passed to a Java Program\nTo compile and run a Java program in the command prompt, follow the steps written below.\nSave the program as Hello.java\nOpen the command prompt window and compile the program- javac Hello.java\nAfter a successful compilation of the program, run the following command by writing the arguments- java Hello\nFor example - java Hello Geeks at GeeksforGeeks\nPress Enter and you will get the desired output.\nclass\nHello\n{\n\/\/ Main driver method\npublic\nstatic\nvoid\nmain\n(\nString\n[]\nargs\n)\n{\n\/\/ Checking if length of args array is\n\/\/ greater than 0\nif\n(\nargs\n.\nlength\n>\n0\n)\n{\n\/\/ Print statements\nSystem\n.\nout\n.\nprintln\n(\n\"The command line\"\n+\n\" arguments are:\"\n);\n\/\/ Iterating the args array\n\/\/ using for each loop\nfor\n(\nString\nval\n:\nargs\n)\nSystem\n.\nout\n.\nprintln\n(\nval\n);\n}\nelse\nSystem\n.\nout\n.\nprintln\n(\n\"No command line \"\n+\n\"arguments found.\"\n);\n}\n}\nOutput:\nCommand Line Arguments in Java\nVisit Course\nSuggested Quiz\n3 Questions\nWhy are command-line arguments useful in Java?\nA\nThey speed up compilation\nB\nThey remove the need for a main method\nC\nThey allow providing input at runtime\nD\nThey convert programs into scripts\nHow can you check the number of command-line arguments passed to a Java program?\nA\nargs.size()\nB\nargs.count()\nC\nargs.length\nD\nargs.getLength()\nWhere does the JVM store command-line arguments before passing them to the program?\nA\nIn a HashMap\nB\nIn an integer array\nC\nIn the args[] array of Strings\nD\nIn a file\nQuiz Completed Successfully\nYour Score :\n0\n\/\n3\nAccuracy :\n0%\nLogin to View Explanation\n1\n\/3\nComment\nArticle Tags:\nExplore\nJava Basics\nOOP & Interfaces\nCollections\nException Handling\nJava Advanced\nPractice Java","attrs_markdown":"[![geeksforgeeks](https:\/\/media.geeksforgeeks.org\/gfg-gg-logo.svg)](https:\/\/www.geeksforgeeks.org\/)\n\n![search icon](https:\/\/media.geeksforgeeks.org\/auth-dashboard-uploads\/Property=Light---Default.svg)\n\n- Sign In\n- [Courses]()\n- [Tutorials]()\n- [Interview Prep]()\n\n- [Java Tutorial](https:\/\/www.geeksforgeeks.org\/java\/java\/)\n- [Advanced Java](https:\/\/www.geeksforgeeks.org\/advance-java\/advanced-java\/)\n- [Interview Questions](https:\/\/www.geeksforgeeks.org\/java\/java-interview-questions\/)\n- [Exercises](https:\/\/www.geeksforgeeks.org\/java\/java-exercises\/)\n- [Examples](https:\/\/www.geeksforgeeks.org\/java\/java-programming-examples\/)\n- [Quizzes](https:\/\/www.geeksforgeeks.org\/java\/java-quiz\/)\n- [Projects](https:\/\/www.geeksforgeeks.org\/blogs\/java-projects\/)\n- [Cheatsheet](https:\/\/www.geeksforgeeks.org\/java\/java-cheat-sheet\/)\n- [DSA in Java](https:\/\/www.geeksforgeeks.org\/dsa\/dsa-in-java\/)\n- [Java Collection](https:\/\/www.geeksforgeeks.org\/java\/java-collection-tutorial\/)\n\n# Command Line Arguments in Java\nLast Updated : 24 Mar, 2026\n\nJava command-line argumentis an argument, i.e., passed at the time of running the Java program. Command-line arguments passed from the console can be received by the Java program and used as input.\n\nExample:\n\n> java Geeks Hello World\n\n****Note:**** Here, the words Hello and World are the command-line arguments.JVM will collect these words and will pass these arguments to the main method as an array of strings called args. The JVM passes these arguments to the program inside args\\[0\\] and args\\[1\\].\n\n****Example****: In this example, we are going to print a simple argument in the command line.\n\nJava\n\n``\n\n****Output:****\n\n![Output 1](https:\/\/media.geeksforgeeks.org\/wp-content\/uploads\/20241227111123375183\/cmd.png)\n\nOutput of first argument\n\n****Explanation****:\n\n- Running java GFG GeeksForGeeks prints GeeksForGeeks because the argument is passed to main(String\\[\\] args).\n- If no arguments are given (e.g., java GFG), it throws ArrayIndexOutOfBoundsException since args is empty.\n### Why Use Command Line Arguments?\n- It is used because it allows us to provide input at runtime without modifying the whole program.\n- It helps to run programs automatically by giving them the needed information from outside.\n## Working of Command-Line Arguments\n- Command-line arguments in Java are space-separated values passed to the main(String\\[\\] args) method.\n- JVM wraps them into the args\\[\\] array, where each value is stored as a string (e.g., args\\[0\\], args\\[1\\], etc.).\n- The number of arguments can be checked using args.length.\n### ****Example****: Display Command-Line Arguments Passed to a Java Program\nTo compile and run a Java program in the command prompt, follow the steps written below.\n\n- Save the program as Hello.java\n- Open the command prompt window and compile the program- javac Hello.java\n- After a successful compilation of the program, run the following command by writing the arguments- java Hello\n- For example - java Hello Geeks at GeeksforGeeks\n- Press Enter and you will get the desired output.\n\nJava\n\n``\n\n****Output:****\n\n![Output 2](https:\/\/media.geeksforgeeks.org\/wp-content\/cdn-uploads\/output-1.png)\n\nCommand Line Arguments in Java\n\n[Visit Course![course link icon](https:\/\/media.geeksforgeeks.org\/auth-dashboard-uploads\/Vector11.svg)](https:\/\/www.geeksforgeeks.org\/courses\/java-online-course-complete-beginner-to-advanced)\n\nSuggested Quiz\n\n![reset](https:\/\/media.geeksforgeeks.org\/auth-dashboard-uploads\/Reset-icon---Light.svg)\n\n3 Questions\n\nWhy are command-line arguments useful in Java?\n\n- A\n  \n  They speed up compilation\n- B\n  \n  They remove the need for a main method\n- C\n  \n  They allow providing input at runtime\n- D\n  \n  They convert programs into scripts\n\nHow can you check the number of command-line arguments passed to a Java program?\n\n- A\n  \n  args.size()\n- B\n  \n  args.count()\n- C\n  \n  args.length\n- D\n  \n  args.getLength()\n\nWhere does the JVM store command-line arguments before passing them to the program?\n\n- A\n  \n  In a HashMap\n- B\n  \n  In an integer array\n- C\n  \n  In the args\\[\\] array of Strings\n- D\n  \n  In a file\n\n![success](https:\/\/media.geeksforgeeks.org\/auth-dashboard-uploads\/sucess-img.png)\n\nQuiz Completed Successfully\n\nYour Score :0\/3\n\nAccuracy :0%\n\nLogin to View Explanation\n\n**1**\/3\n\n\\< Previous\n\nNext \\>\n\nComment\n\n[T](https:\/\/www.geeksforgeeks.org\/user\/Twinkle%20Tyagi\/)\n\ntwinkle tyagi\n\n193\n\nArticle Tags:\n\nArticle Tags:\n\n[Java](https:\/\/www.geeksforgeeks.org\/category\/programming-language\/java\/)\n\n[java-basics](https:\/\/www.geeksforgeeks.org\/tag\/java-basics\/)\n### Explore\n\n[![GeeksforGeeks](https:\/\/media.geeksforgeeks.org\/auth-dashboard-uploads\/gfgFooterLogo.png)](https:\/\/www.geeksforgeeks.org\/)\n\n![location](https:\/\/media.geeksforgeeks.org\/img-practice\/Location-1685004904.svg)\n\nCorporate & Communications Address:\n\nA-143, 7th Floor, Sovereign Corporate Tower, Sector- 136, Noida, Uttar Pradesh (201305)\n\n![location](https:\/\/media.geeksforgeeks.org\/img-practice\/Location-1685004904.svg)\n\nRegistered Address:\n\nK 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[Java](https:\/\/www.geeksforgeeks.org\/videos\/category\/java-w6y5f4\/)\n- [C++](https:\/\/www.geeksforgeeks.org\/videos\/category\/c\/)\n- [Web Development](https:\/\/www.geeksforgeeks.org\/videos\/category\/web-development\/)\n- [Data Science](https:\/\/www.geeksforgeeks.org\/videos\/category\/data-science\/)\n- [CS Subjects](https:\/\/www.geeksforgeeks.org\/videos\/category\/cs-subjects\/)\n\n- Preparation Corner\n- [Interview Corner](https:\/\/www.geeksforgeeks.org\/interview-prep\/interview-corner\/)\n- [Aptitude](https:\/\/www.geeksforgeeks.org\/aptitude\/aptitude-questions-and-answers\/)\n- [Puzzles](https:\/\/www.geeksforgeeks.org\/aptitude\/puzzles\/)\n- [GfG 160](https:\/\/www.geeksforgeeks.org\/courses\/gfg-160-series)\n- [System Design](https:\/\/www.geeksforgeeks.org\/system-design\/system-design-tutorial\/)\n\n[@GeeksforGeeks, Sanchhaya Education Private Limited](https:\/\/www.geeksforgeeks.org\/), [All rights reserved](https:\/\/www.geeksforgeeks.org\/copyright-information\/)\n\n![]()","attrs_readable_markdown":"Last Updated : 24 Mar, 2026\n\nJava command-line argumentis an argument, i.e., passed at the time of running the Java program. Command-line arguments passed from the console can be received by the Java program and used as input.\n\nExample:\n\n> java Geeks Hello World\n\n****Note:**** Here, the words Hello and World are the command-line arguments.JVM will collect these words and will pass these arguments to the main method as an array of strings called args. The JVM passes these arguments to the program inside args\\[0\\] and args\\[1\\].\n\n****Example****: In this example, we are going to print a simple argument in the command line.\n\n``\n\n****Output:****\n\n![Output 1](https:\/\/media.geeksforgeeks.org\/wp-content\/uploads\/20241227111123375183\/cmd.png)\n\nOutput of first argument\n\n****Explanation****:\n\n- Running java GFG GeeksForGeeks prints GeeksForGeeks because the argument is passed to main(String\\[\\] args).\n- If no arguments are given (e.g., java GFG), it throws ArrayIndexOutOfBoundsException since args is empty.\n### Why Use Command Line Arguments?\n- It is used because it allows us to provide input at runtime without modifying the whole program.\n- It helps to run programs automatically by giving them the needed information from outside.\n## Working of Command-Line Arguments\n- Command-line arguments in Java are space-separated values passed to the main(String\\[\\] args) method.\n- JVM wraps them into the args\\[\\] array, where each value is stored as a string (e.g., args\\[0\\], args\\[1\\], etc.).\n- The number of arguments can be checked using args.length.\n### ****Example****: Display Command-Line Arguments Passed to a Java Program\nTo compile and run a Java program in the command prompt, follow the steps written below.\n\n- Save the program as Hello.java\n- Open the command prompt window and compile the program- javac Hello.java\n- After a successful compilation of the program, run the following command by writing the arguments- java Hello\n- For example - java Hello Geeks at GeeksforGeeks\n- Press Enter and you will get the desired output.\n\n``\n\n****Output:****\n\n![Output 2](https:\/\/media.geeksforgeeks.org\/wp-content\/cdn-uploads\/output-1.png)\n\nCommand Line Arguments in Java\n\n[Visit Course![course link icon](https:\/\/media.geeksforgeeks.org\/auth-dashboard-uploads\/Vector11.svg)](https:\/\/www.geeksforgeeks.org\/courses\/java-online-course-complete-beginner-to-advanced)\n\nSuggested Quiz\n\n3 Questions\n\nWhy are command-line arguments useful in Java?\n\n- A\n  \n  They speed up compilation\n- B\n  \n  They remove the need for a main method\n- C\n  \n  They allow providing input at runtime\n- D\n  \n  They convert programs into scripts\n\nHow can you check the number of command-line arguments passed to a Java program?\n\n- A\n  \n  args.size()\n- B\n  \n  args.count()\n- C\n  \n  args.length\n- D\n  \n  args.getLength()\n\nWhere does the JVM store command-line arguments before passing them to the program?\n\n- A\n  \n  In a HashMap\n- B\n  \n  In an integer array\n- C\n  \n  In the args\\[\\] array of Strings\n- D\n  \n  In a file\n\n![success](https:\/\/media.geeksforgeeks.org\/auth-dashboard-uploads\/sucess-img.png)\n\nQuiz Completed Successfully\n\nYour Score :0\/3\n\nAccuracy :0%\n\nLogin to View Explanation\n\n**1**\/3\n\nComment\n\nArticle Tags:\n\n### Explore","meta_canonical":null}

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HTTP status	PASS	`download_http_code = 200`	HTTP 200
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URL	https://www.geeksforgeeks.org/java/command-line-arguments-in-java/
Last Crawled	2026-04-10 00:10:55 (3 days ago)
First Indexed	2025-06-13 01:16:41 (10 months ago)
HTTP Status Code	200
Meta Title	Command Line Arguments in Java - GeeksforGeeks
Meta Description	Your All-in-One Learning Portal: GeeksforGeeks is a comprehensive educational platform that empowers learners across domains-spanning computer science and programming, school education, upskilling, commerce, software tools, competitive exams, and more., Your All-in-One Learning Portal. It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions.
Meta Canonical	null
Boilerpipe Text	Last Updated : 24 Mar, 2026 Java command-line argument is an argument, i.e., passed at the time of running the Java program. Command-line arguments passed from the console can be received by the Java program and used as input. Example: java Geeks Hello World Note: Here, the words Hello and World are the command-line arguments. JVM will collect these words and will pass these arguments to the main method as an array of strings called args. The JVM passes these arguments to the program inside args[0] and args[1]. Example : In this example, we are going to print a simple argument in the command line. // Java Program to Illustrate First Argument class GFG { public static void main ( String [] args ) { // Printing the first argument System . out . println ( args [ 0 ] ); } } Output: Output of first argument Explanation : Running java GFG GeeksForGeeks prints GeeksForGeeks because the argument is passed to main(String[] args). If no arguments are given (e.g., java GFG), it throws ArrayIndexOutOfBoundsException since args is empty. Why Use Command Line Arguments? It is used because it allows us to provide input at runtime without modifying the whole program. It helps to run programs automatically by giving them the needed information from outside. Working of Command-Line Arguments Command-line arguments in Java are space-separated values passed to the main(String[] args) method. JVM wraps them into the args[] array, where each value is stored as a string (e.g., args[0], args[1], etc.). The number of arguments can be checked using args.length. Example : Display Command-Line Arguments Passed to a Java Program To compile and run a Java program in the command prompt, follow the steps written below. Save the program as Hello.java Open the command prompt window and compile the program- javac Hello.java After a successful compilation of the program, run the following command by writing the arguments- java Hello For example - java Hello Geeks at GeeksforGeeks Press Enter and you will get the desired output. class Hello { // Main driver method public static void main ( String [] args ) { // Checking if length of args array is // greater than 0 if ( args . length > 0 ) { // Print statements System . out . println ( "The command line" + " arguments are:" ); // Iterating the args array // using for each loop for ( String val : args ) System . out . println ( val ); } else System . out . println ( "No command line " + "arguments found." ); } } Output: Command Line Arguments in Java Visit Course Suggested Quiz 3 Questions Why are command-line arguments useful in Java? A They speed up compilation B They remove the need for a main method C They allow providing input at runtime D They convert programs into scripts How can you check the number of command-line arguments passed to a Java program? A args.size() B args.count() C args.length D args.getLength() Where does the JVM store command-line arguments before passing them to the program? A In a HashMap B In an integer array C In the args[] array of Strings D In a file Quiz Completed Successfully Your Score : 0 / 3 Accuracy : 0% Login to View Explanation 1 /3 Comment Article Tags: Explore Java Basics OOP & Interfaces Collections Exception Handling Java Advanced Practice Java
Markdown	[![geeksforgeeks](https://media.geeksforgeeks.org/gfg-gg-logo.svg)](https://www.geeksforgeeks.org/) ![search icon](https://media.geeksforgeeks.org/auth-dashboard-uploads/Property=Light---Default.svg) - Sign In - [Courses]() - [Tutorials]() - [Interview Prep]() - [Java Tutorial](https://www.geeksforgeeks.org/java/java/) - [Advanced Java](https://www.geeksforgeeks.org/advance-java/advanced-java/) - [Interview Questions](https://www.geeksforgeeks.org/java/java-interview-questions/) - [Exercises](https://www.geeksforgeeks.org/java/java-exercises/) - [Examples](https://www.geeksforgeeks.org/java/java-programming-examples/) - [Quizzes](https://www.geeksforgeeks.org/java/java-quiz/) - [Projects](https://www.geeksforgeeks.org/blogs/java-projects/) - [Cheatsheet](https://www.geeksforgeeks.org/java/java-cheat-sheet/) - [DSA in Java](https://www.geeksforgeeks.org/dsa/dsa-in-java/) - [Java Collection](https://www.geeksforgeeks.org/java/java-collection-tutorial/) # Command Line Arguments in Java Last Updated : 24 Mar, 2026 Java command-line argumentis an argument, i.e., passed at the time of running the Java program. Command-line arguments passed from the console can be received by the Java program and used as input. Example: > java Geeks Hello World **Note: Here, the words Hello and World are the command-line arguments.JVM will collect these words and will pass these arguments to the main method as an array of strings called args. The JVM passes these arguments to the program inside args\[0\] and args\[1\]. Example: In this example, we are going to print a simple argument in the command line. Java `` Output: ![Output 1](https://media.geeksforgeeks.org/wp-content/uploads/20241227111123375183/cmd.png) Output of first argument Explanation: - Running java GFG GeeksForGeeks prints GeeksForGeeks because the argument is passed to main(String\[\] args). - If no arguments are given (e.g., java GFG), it throws ArrayIndexOutOfBoundsException since args is empty. ### Why Use Command Line Arguments? - It is used because it allows us to provide input at runtime without modifying the whole program. - It helps to run programs automatically by giving them the needed information from outside. ## Working of Command-Line Arguments - Command-line arguments in Java are space-separated values passed to the main(String\[\] args) method. - JVM wraps them into the args\[\] array, where each value is stored as a string (e.g., args\[0\], args\[1\], etc.). - The number of arguments can be checked using args.length. ### Example: Display Command-Line Arguments Passed to a Java Program To compile and run a Java program in the command prompt, follow the steps written below. - Save the program as Hello.java - Open the command prompt window and compile the program- javac Hello.java - After a successful compilation of the program, run the following command by writing the arguments- java Hello - For example - java Hello Geeks at GeeksforGeeks - Press Enter and you will get the desired output. Java `` Output: ![Output 2](https://media.geeksforgeeks.org/wp-content/cdn-uploads/output-1.png) Command Line Arguments in Java [Visit Course![course link icon](https://media.geeksforgeeks.org/auth-dashboard-uploads/Vector11.svg)](https://www.geeksforgeeks.org/courses/java-online-course-complete-beginner-to-advanced) Suggested Quiz ![reset](https://media.geeksforgeeks.org/auth-dashboard-uploads/Reset-icon---Light.svg) 3 Questions Why are command-line arguments useful in Java? - A They speed up compilation - B They remove the need for a main method - C They allow providing input at runtime - D They convert programs into scripts How can you check the number of command-line arguments passed to a Java program? - A args.size() - B args.count() - C args.length - D args.getLength() Where does the JVM store command-line arguments before passing them to the program? - A In a HashMap - B In an integer array - C In the args\[\] array of Strings - D In a file ![success](https://media.geeksforgeeks.org/auth-dashboard-uploads/sucess-img.png) Quiz Completed Successfully Your Score :0/3 Accuracy :0% Login to View Explanation 1**/3 \< Previous Next \> Comment [T](https://www.geeksforgeeks.org/user/Twinkle%20Tyagi/) twinkle tyagi 193 Article Tags: Article Tags: [Java](https://www.geeksforgeeks.org/category/programming-language/java/) [java-basics](https://www.geeksforgeeks.org/tag/java-basics/) ### Explore [![GeeksforGeeks](https://media.geeksforgeeks.org/auth-dashboard-uploads/gfgFooterLogo.png)](https://www.geeksforgeeks.org/) ![location](https://media.geeksforgeeks.org/img-practice/Location-1685004904.svg) Corporate & Communications Address: A-143, 7th Floor, Sovereign Corporate Tower, Sector- 136, Noida, Uttar Pradesh (201305) ![location](https://media.geeksforgeeks.org/img-practice/Location-1685004904.svg) Registered Address: K 061, Tower K, Gulshan Vivante Apartment, Sector 137, Noida, Gautam Buddh Nagar, Uttar Pradesh, 201305 [![GFG App on Play Store](https://media.geeksforgeeks.org/auth-dashboard-uploads/googleplay-%281%29.png)](https://geeksforgeeksapp.page.link/gfg-app)[![GFG App on App Store](https://media.geeksforgeeks.org/auth-dashboard-uploads/appstore-%281%29.png)](https://geeksforgeeksapp.page.link/gfg-app) - 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Readable Markdown	Last Updated : 24 Mar, 2026 Java command-line argumentis an argument, i.e., passed at the time of running the Java program. Command-line arguments passed from the console can be received by the Java program and used as input. Example: > java Geeks Hello World **Note: Here, the words Hello and World are the command-line arguments.JVM will collect these words and will pass these arguments to the main method as an array of strings called args. The JVM passes these arguments to the program inside args\[0\] and args\[1\]. Example: In this example, we are going to print a simple argument in the command line. `` Output: ![Output 1](https://media.geeksforgeeks.org/wp-content/uploads/20241227111123375183/cmd.png) Output of first argument Explanation: - Running java GFG GeeksForGeeks prints GeeksForGeeks because the argument is passed to main(String\[\] args). - If no arguments are given (e.g., java GFG), it throws ArrayIndexOutOfBoundsException since args is empty. ### Why Use Command Line Arguments? - It is used because it allows us to provide input at runtime without modifying the whole program. - It helps to run programs automatically by giving them the needed information from outside. ## Working of Command-Line Arguments - Command-line arguments in Java are space-separated values passed to the main(String\[\] args) method. - JVM wraps them into the args\[\] array, where each value is stored as a string (e.g., args\[0\], args\[1\], etc.). - The number of arguments can be checked using args.length. ### Example: Display Command-Line Arguments Passed to a Java Program To compile and run a Java program in the command prompt, follow the steps written below. - Save the program as Hello.java - Open the command prompt window and compile the program- javac Hello.java - After a successful compilation of the program, run the following command by writing the arguments- java Hello - For example - java Hello Geeks at GeeksforGeeks - Press Enter and you will get the desired output. `` Output: ![Output 2](https://media.geeksforgeeks.org/wp-content/cdn-uploads/output-1.png) Command Line Arguments in Java [Visit Course![course link icon](https://media.geeksforgeeks.org/auth-dashboard-uploads/Vector11.svg)](https://www.geeksforgeeks.org/courses/java-online-course-complete-beginner-to-advanced) Suggested Quiz 3 Questions Why are command-line arguments useful in Java? - A They speed up compilation - B They remove the need for a main method - C They allow providing input at runtime - D They convert programs into scripts How can you check the number of command-line arguments passed to a Java program? - A args.size() - B args.count() - C args.length - D args.getLength() Where does the JVM store command-line arguments before passing them to the program? - A In a HashMap - B In an integer array - C In the args\[\] array of Strings - D In a file ![success](https://media.geeksforgeeks.org/auth-dashboard-uploads/sucess-img.png) Quiz Completed Successfully Your Score :0/3 Accuracy :0% Login to View Explanation 1**/3 Comment Article Tags: ### Explore
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