Java 5 för nybörjare - Programmering & spelutveckling Tillbaka till artikelarkivet Detta är en enkel nybörjarguide i Java. Guiden kommer att inrikta sig på att skapa sk Applets så att vi snabbt kan komma till de lite roligare bitarna av programmeringen. Navigation: Språket Nu har vi lekt runt lite med applets och ritat lite enkla saker. Klasser Nu har jag nämnt ordet klasser ganska många gånger, och du har troligtvis inte så bra koll på vad det är ändå. Metoder Vi har även skrivit ett par metoder. Datatyper En datatyp är en typ utav data. Returvärden Nu ska vi tillbaka till metoderna en liten stund. Konkreta tillämpningar Nu har jag svammlat massor om datatyper, variabler, objekt och så vidare. Så kan en mycket enkel klass se ut. Nu ska jag visa hur man gör ett objekt utav en klass. public class HuvudKlass { public void HuvudKlass() { NyKlass Objekt = new NyKlass();}}public class NyKlass {} Nu uppstår ju en annan intressant fråga. Okej då, detta kanske var lite svårt. int tal;tal = 5;[/source=java]Inte så knepigt va? import java.applet. Till toppen
OOP Spelprogrammering Dataspel Många dataspel kan liknas vid simuleringar av en verklig eller påhittad värld. T.ex bilspel, äventyrsspel, eller spel som SimCity och Sims. Simulera betyder efterlikna. Följande är typiskt för spel-liknande simuleringar: Det finns en värld med objekt Det finns ett tidsflöde (realtid, nedsaktad tid, uppsnabbad tid) Objekten i världen är aktiva och kan ha varierande grad av AI Världen visualiseras på bildskärmen Spelaren kan interagera med objekten i världen på olika sätt Spelprogrammering Centrala delar i ett spelprogram: Grafik ("Sprites") Uppdateringsloop (Timer) Inmatning (mus och tangentbord) Nedan diskuteras dessa. Sprite-animeringar Sprite betyder "älva". Sprites i Java Det finns två grundläggande sätt att programmera sprites i Java: Som komponenter i ett fönster (där spriteklasserna är subklasser till t.ex JComponent eller JLabel) Som egna objekt som ritas upp i via paintComponent. Null-layout Exempel där en JLabel visar en bild på koordinat 100,100: Dubbelbuffrad animering Ljud
guice - Calling JavaFX From Java? While experimenting with JavaFX, remember that Java is never far away. In this case, let's call out to Jim Weaver's JavaFX Calculator demo: Here we go, here's all that's needed, via the Scripting API, which is included in the JavaFX SDK: 01.package calc; 03.import java.io.InputStreamReader; 04.import javax.script.ScriptEngine; 05.import javax.script.ScriptEngineManager; 06.import javax.script.ScriptException; 08.public class CalculatorLauncher { 10. public static void main(String[] args) { 11. try { 12. 13. 14. 15. engine.eval(reader); 16. } catch (ScriptException ex) { And so, here's my whole application, calling Jim Weaver's Calculator demo: Nice.
Java tutorial for beginners | freejavaguide.com These tutorials will introduce you to Java programming Language. You'll compile and run your very own Java application, using Sun's JDK. It is extremely easy to learn java programming skills, and in these parts, you'll learn how to write, compile, and run Java applications. Before you can develop corejava applications, you'll need to download the Java Development Kit (JDK). How to Install Java These instructions are to help you download and install Java on your personal computer. Downloading and Installing Java On Windows: Prevent Errors like --> 'javac' is not recognized as an internal or external command 1. 2. 4. For Windows 98 or ME, open the file AUTOEXEC.BAT in Notepad. 5. 6.
The Java™ Tutorials The Java Tutorials have been written for JDK 8. Examples and practices described in this page don't take advantage of improvements introduced in later releases. The Java Tutorials are practical guides for programmers who want to use the Java programming language to create applications. They include hundreds of complete, working examples, and dozens of lessons. Trails Covering the Basics These trails are available in book form as The Java Tutorial, Sixth Edition. Creating Graphical User Interfaces Creating a GUI with Swing — A comprehensive introduction to GUI creation on the Java platform.Creating a JavaFX GUI — A collection of JavaFX tutorials. Specialized Trails and Lessons These trails and lessons are only available as web pages.
Tutorial: Java Collections - CodeCall Programming Forum Collections Collections are an interface in the java.util package, and as its name suggests, it is used to define a collection of objects. There are many different classes which implement the collections interface. Each one has its unique features, some add elements in a sorted manner, others in a binary fashion. Here is how you do it 1) Declare any object you wish to insert into a Map. DummyClass1 dm2 = new DummyClass1(); 2) Now you declare a HashMap which will store the key value pair. Map m = new HashMap(); //Old method Map<DummyClass> m = new HashMap<DummyClass>(); //New method as per Java 1.5 and above 3) To add the object to a map you need to use the put function. m.put("KEY1", dm1); 4) To retrieve this object use the get method and use KEY1 to identify the object to retrieve it. DummyClass1 dm3; dm3 = (DummyClass1)m.get("KEY1"); List1) Declare the objects you wish to add in the list. DummyClass dummyClass1 = new DummyClass();DummyClass dummyClass2 = new DummyClass(); Code Output List
15 Exercises for Learning a new Programming Language by: Prashant N Mhatre I’ve working knowledge of a bunch of programming languages but job demands to learn a new language frequently in a short time. Instead of reading hundreds manual/book pages, I quickly read 10-15 pages of tutorial or primer. (As you know google is the best search engine to look for such stuff). First of all, get familiar with Compiler, compiler option, editor shortcuts or integrated development environment (IDE). To grasp basics of a new language quickly, here are the exercises I use. (1) Display series of numbers (1,2,3,4, 5....etc) in an infinite loop. (2) Fibonacci series, swapping two variables, finding maximum/minimum among a list of numbers. (3) Accepting series of numbers, strings from keyboard and sorting them ascending, descending order. (5) Modify the above program such that it will ask for ’Do you want to calculate again (y/n), if you say ’y’, it’ll again ask the parameters. While running the program give value mu = 0. About The Author Prashant N Mhatre