{"id":5197,"date":"2021-03-23T12:13:04","date_gmt":"2021-03-23T12:13:04","guid":{"rendered":"https:\/\/ded9.com\/?p=5197"},"modified":"2025-10-22T13:05:29","modified_gmt":"2025-10-22T13:05:29","slug":"learn-hello-world-in-java-in-very-simple-language","status":"publish","type":"post","link":"https:\/\/ded9.com\/de\/learn-hello-world-in-java-in-very-simple-language\/","title":{"rendered":"Learn \u201cHello World\u201d in Java: Easy Step-by-Step Guide"},"content":{"rendered":"
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Hello World! It is a simple program that outputs Hello, World! Prints on the screen. Because the program is so simple, it is usually used to introduce a new programming language to a new user.<\/span><\/span><\/p>\n

Let’s check out how “Hello World!” works.<\/p>\n

To run this program on your System, ensure Java is installed correctly. You also need an IDE (or text editor) to write and edit Java<\/a> code<\/a>.<\/p>\n

Hello World application in Java<\/h2>\n

\"Hello<\/h2>\n
\n
    \n
  1. \/\/ Your First Program<\/li>\n
  2. class HelloWorld {<\/li>\n
  3. public static void main (String [] args) {<\/li>\n
  4. System.out.println (\u201cHello, World!\u201d);<\/li>\n
  5. }<\/li>\n
  6. }<\/li>\n<\/ol>\n<\/blockquote>\n

    If you copied the code accurately, save the File name HelloWorld.java because the class name and filename in Java must match.<\/p>\n

    When you run the program, the output is:<\/p>\n

    \n
    Hello, World!<\/pre>\n<\/div>\n
    “Hello World!”\u00a0How does it work in Java?<\/h2>\n
    \u00a0\/\/ Your First Program<\/strong><\/p>\n
    In Java, any line starting with \/\/ is a comment.\u00a0Comments to read the description of the code and understand more about it.\u00a0The Java compiler completely ignores these lines (the application that executes Java code for the computer).<\/p>\n
    \u00a0class HelloWorld\u2026\u2026<\/strong><\/p>\n
    In Java, every program starts with a class definition. In the above program, HelloWorld is the class name, and the class definition is:<\/p>\n
    \n
    class HelloWorld {\r\n\r\n\u2026 ..\u2026\r\n\r\n}<\/pre>\n<\/div>\n
    Remember that every Java program has a class definition, and the class name must match the File name in Java.<\/p>\n
    public static void main (String [] args) {\u2026\u2026<\/strong><\/p>\n
    The top line is the primary method. Every Java program must have a main method. The Java compiler starts executing the code using the primary process.<\/p>\n
    Remember that the primary function is the Java entry point of the mandatory program. The signature of the primary function in Java is equal to:<\/p>\n
    \n
    public static void main (String [] args) {\r\n\r\n\u2026 ..\u2026\r\n\r\n}\r\nSystem.out.println (\"Hello, World!\");<\/span><\/pre>\n<\/div>\n
    The above code prints the String inside the quotation mark in the standard output (screen). Note, this is the line of code inside the primary function inside the class definition.<\/p>\n
    Important Points<\/h2>\n
      \n
    • Every valid Java program must have a class definition (which matches the File name).<\/li>\n
    • The primary function must be in the class definition.<\/li>\n
    • The compiler starts executing the code from the primary function.<\/li>\n<\/ul>\n
      The following code is a valid Java program that does nothing.<\/p>\n
      \n
      public class HelloWorld {\r\n\r\npublic static void main (String [] args) {\r\n\r\n\/\/ Write your code here\r\n\r\n}\r\n\r\n}<\/pre>\n<\/div>\n
      If you do not understand the meaning of class, static, methods, and so on, do not worry. We will explain them in full in the following sections.<\/p>\n
      FAQ<\/h2>\n
      \n
      \n
      \n
      What does the \u201cHello World\u201d program do in Java?<\/h3>\n
      \n\n
      It displays the text Hello World on the screen\u2014this simple program ensures your development setup is working correctly.<\/p>\n\n<\/div>\n<\/div>\n
      \n
      Which tools do I need to write my first Java program?<\/h3>\n
      \n\n
      You\u2019ll need the Java Development Kit (JDK) installed and a basic text editor or an IDE like Eclipse or IntelliJ\u202fIDEA to write your code.<\/p>\n\n<\/div>\n<\/div>\n
      \n
      How do I compile and run my Java program from the command line?<\/h3>\n
      \n\n
      Save your code in a .java file, then run javac FileName.java to compile and java FileName to execute it, assuming your PATH is set correctly.<\/p>\n\n<\/div>\n<\/div>\n<\/div>\n<\/div><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n","protected":false},"excerpt":{"rendered":"
      Hello World! It is a simple program that outputs Hello, World! Prints on the screen. Because the program is so simple, it is usually used to introduce a new programming language to a new user. Let’s check out how “Hello World!” works. To run this program on your System, ensure Java is installed correctly. You […]<\/p>\n","protected":false},"author":6,"featured_media":5198,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[11513],"tags":[3018,840],"class_list":["post-5197","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-java-2","tag-ide","tag-java"],"acf":[],"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/ded9.com\/de\/wp-json\/wp\/v2\/posts\/5197","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ded9.com\/de\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ded9.com\/de\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ded9.com\/de\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/ded9.com\/de\/wp-json\/wp\/v2\/comments?post=5197"}],"version-history":[{"count":4,"href":"https:\/\/ded9.com\/de\/wp-json\/wp\/v2\/posts\/5197\/revisions"}],"predecessor-version":[{"id":263745,"href":"https:\/\/ded9.com\/de\/wp-json\/wp\/v2\/posts\/5197\/revisions\/263745"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/ded9.com\/de\/wp-json\/wp\/v2\/media\/5198"}],"wp:attachment":[{"href":"https:\/\/ded9.com\/de\/wp-json\/wp\/v2\/media?parent=5197"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ded9.com\/de\/wp-json\/wp\/v2\/categories?post=5197"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ded9.com\/de\/wp-json\/wp\/v2\/tags?post=5197"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}