The boldface lines in the following listing begin and end the definition of the main method in Java

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The boldface lines in the following listing begin and end the definition of the main method
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/** * The HelloWorldApp class implements an application that * simply displays "Hello World!" to the standard output
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*/ class HelloWorldApp { public static void main(String[] args) { Systemoutprintln("Hello World!"); //Display the string } }
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Every application must contain a main method declared like this:
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public static void main(String[] args)
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Themain method declaration starts with three modifiers:
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public: Allows any class to call the main method
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Table of Contents
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Java Tutorial, Third instance of the class Course on Edition: A Short instead of operating on an the Basics, The
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void: Indicates Walrath,Alison Huml ByMary Campione,Kathythat the main method does not return a value
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static: Means that the main method is associated with the HelloWorldApp class as a whole
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When you invoke the interpreter, you give it the name of the class that you want to run This class is Publisher : Addison Wesley the application's controlling class and must contain a main method When invoked, the interpreter Pub Date : December 28, 2000 starts by calling the class's main method, which then calls all the other meth-ods required to run the ISBN : 0-201-70393-9 application If you try to invoke the interpreter on a class that does not have a main method, the Pages interpreter : 592 run your program Instead, the interpreter displays an error message similar to this: can't
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In class NoMain: void main(String argv[]) is not defined
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"This book see from the the rest because main method, it accepts a web and read by thousands As you can stands above declaration of theit has been available on the single argument: an array of of Java programmers The authors have elements of type String, like this: received an enormous amount of feedback about which sections are good and which sections are confusing; the confusing ones have been improved I doubt that any other Java book has undergone such trial by fire" -Metroplex Java User Group, public static void main(String[] args) wwwjavamugorg/reviews/
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This array is thetaking a class or learning on the job, Virtual Machine passesThird Edition to is a handsWhether you're mechanism through which the Java The Java(TM) Tutorial, information , your application Each String in the array is called a with the Java programming language Written by on guide that lets you quickly become proficient command-line argument Command-line arguments let users affect the operation ofteamapplication without recompiling it Thean interactive approach to members of the Java Software the at Sun Microsystems, the book uses HelloWorldApp application ignores its command-line arguments, so there isn't much more to discuss here help you learn the Java platform by example
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Since its first online release in 1995, the material in The Java(TM) Tutorial has been updated Using Classesto reflect reader feedback and new releases of the Java platform This third edition has continuously and Objects been thoroughly updated to cover v13 of the Java Platform, Standard Edition, as well as preceding versions as early as application is about the simplest program you can write that actually does TheHelloWorldAppJDK 11 something Because it is such a simple program, it doesn't need to define any classes except You will find clear HelloWorldApp explanations of such fundamentals as objects, classes, and data structures In addition, the book provides introductions to object-oriented programming, applet construction, and user interface design Other topics include class, System, and threads the Java API The avoid many However, the application does use another exceptions, I/O,that is part of To help beginners System common mistakes, an entire chapter is devoted to programming problems and their solutions class provides system-independent access to system-dependent functionality One feature provided by Convenient summaries at the end of each section place to send edition usually refers to edition are theSystem class is the standard output stream a are new to thistext that Also new for this the "Questions and Exercises" sections to the you interpreter terminal window in which you invokedhelp Java practice what you learn After working through the lessons in this proven tutorial, you will be well prepared to use the Java programming language in your school or workplace
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Impurity Alert! Using the standard output stream isn't recommended in 100% Pure Java programs However, it's fine to use during the development cycle We use it in many of our example programs because otherwise, our code would be longer and more difficult to read
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The following boldface line shows HelloWorldApp's use of the standard output stream to display the stringHello World:
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/** * The HelloWorldApp class implements an application that * simply displays "Hello World!" to the standard output */ class HelloWorldApp { public static void main(String[] args) { Systemoutprintln("Hello World!"); //Display the string } }
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This one line of code uses both a class variable and an instance method Let's take a look at the first segment of the statement:
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