Importing Classes and Packages in Java

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HelloWorldjava begins with two import statements that import the Applet and Graphics
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import javaappletApplet; import javaawtGraphics; public class HelloWorld extends Applet { Table of Contents public void paint(Graphics g) { Java gdrawString("Hello world!", 50, 25);Course Tutorial, Third Edition: A Short } the Basics, The }
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By importing classes or packages, a class can easily refer to classes in other packages In the Java Publisher : Addison Wesley programming language, packages are used to group classes, similar to the way libraries group C Pub Date : you removed the functions If December 28, 2000first two lines, you could still compile and run the program, but you could do so: only if you changed the rest of the code like this (as shown in boldface): ISBN 0-201-70393-9
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Pages : 592
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public class HelloWorld extends javaappletApplet { public void paint(javaawtGraphics g) { gdrawString("Hello world!", 50, 25); "This } book stands above the rest because it has been available on the web and read by thousands of Java programmers The authors have received an enormous amount of feedback about which sections }
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are good and which sections are confusing; the confusing ones have been improved I doubt that any As you can book importing the Applet and Graphics classes lets theUser Group, other Java see, has undergone such trial by fire" -Metroplex Java program refer to them later without any prefixes The javaapplet and javaawt prefixes tell the compiler which packages it wwwjavamugorg/reviews/ should search for the Applet and Graphics classes The javaapplet package contains classes that Whether you're taking a class or learning on the contains classes used by all programs , is a handsare essential to applets The javaawt package job, The Java(TM) Tutorial, Third Editionwith a GUI on guide that lets you quickly become proficient with the Java programming language Written by You mightof the noticed that the HelloWorldApp application uses the System class without any to members have Java Software team at Sun Microsystems, the book uses an interactive approach prefix, yet it does not import the by example The reason is that the System class is part of the help you learn the Java platform System class javalang package, and everything in the javalang package is automatically imported into every Since its written in release programming language program first onlinethe Java in 1995, the material in The Java(TM) Tutorial has been updated continuously to reflect reader feedback and new releases of the Java platform This third edition has You can import not only individual v13 of the Java entire packages Here's an example: preceding been thoroughly updated to cover classes but also Platform, Standard Edition, as well as versions as early as JDK 11
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import javaapplet*; You will find clear explanations of such fundamentals as objects, classes, and data structures In import javaawt*;
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addition, the book provides introductions to object-oriented programming, applet construction, and
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user interface design Other topics include exceptions, I/O, and threads To help beginners avoid many public class HelloWorld extends Applet { common mistakes, an entire chapter is devoted to programming problems and their solutions public void paint(Graphics g) { Convenient summaries at the end of each section are new to this edition Also new for this edition are gdrawString("Hello world!", 50, 25); "Questions and Exercises" sections to help you 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 code for a Every class is in a package If the source workplace class doesn't have a package statement at the top declaring in which package the class is, the class is in the default package Almost all the example classes in this tutorial are in the default package, javalang
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Within a package, all classes can refer to one another without prefixes For example, the javaawt package'sComponent class refers to the same package's Graphics class without any prefixes and without importing the Graphics class
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Defining an Applet Subclass The first boldface line of the following listing begins a block that defines the HelloWorld class:
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import javaappletApplet; import javaawtGraphics; public class HelloWorld extends Applet { public void paint(Graphics g) { gdrawString("Hello world!", 50, 25); } }
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Theextends keyword indicates that HelloWorld is a subclass of the Applet class In fact, every applet must define of subclass of the Applet class Applets inherit a great deal of functionality from the Table a Contents Applet class, ranging from the ability to communicate with the browser to the ability to present a Java Tutorial, Third Edition: A Short Course on graphical user interface (GUI) You will learn more about subclasses in the chapter Object-Oriented the Basics, The Programming Concepts (page 45)
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