Write java games

If possible, work with a person whose job it is to define the application you're coding. If you have no one to work with, make sure to list your targets first—and only then put on your "coder hat. By default, Java looks for a main method or "function," as they're called in many other languages to run in a class. Not all classes need a main method, but this demo app only has one method, so it may as well be the main one. Methods, like fields, can be made public or private and static or non-static, but the main method must be public and static for the Java compiler to recognize and utilize it.

For this application to work as a game, it must continue to run while the player takes guesses at a secret pseudo-random number. Were the application to stop after each guess, the player would only have one guess and would very rarely win. It's also part of the game's design that the computer provides hints to guide the player's next guess. A while loop with embedded if statements achieves this design target. A while loop inherently continues to run until a specific condition is met.

The main method starts by creating a new Scanner instance. This is the same principle as the Random instance used as a pseudo-random seed: You cite the class you want to use as a template, provide a variable name I use player to represent the person entering guesses , and then set that variable to the results of running the class' main method. Again, if you were coding this on your own, you'd look at the class' documentation to get the syntax when using it.

That makes the game moot, but it's useful to prove to yourself that it's working correctly. Even this small debugging statement reveals some important Java tips: System. In this loop, the player is prompted for a number. The Scanner object, called player , takes any valid integer entered by the player and puts its value into the guess field. At this point, the game prints a congratulatory message and exits.

To test your game, save the sample code as Guess. While it isn't as impressive on a single-file application like this as it is on a complex project, Java makes packaging very easy. For the best results, structure your project directory to include a place for your source code, a place for your compiled class, and a manifest file. In practice, this is somewhat flexible, and using an IDE does most of the work for you.

It's useful to do it by hand once in a while, though. Create a project folder if you haven't already. Then create one directory called src to hold your source files. Now, create a directory tree that mirrors the name of your Java package, which appears at the very top of your code:.

Next, compile your game into a Java class. This produces a file called Main. You're all set to package your application into a JAR Java archive. Then, get the input and subtract that many sticks away:. From here, two things can happen. Either the player took the last stick, or it's the computer's turn to take sticks. That means we once again need an if statement. Remember that any time there are two or more possible ways your program can go, you need to use an if statement.

So, how do we check if the player took the last stick? Inside the else part, we want to make the computer take its turn. Here we'll use some simple artificial intelligence in order to make the computer decide how many sticks to take. Our computer's logic will be simple: if taking two sticks makes it lose the game, or if taking two sticks leaves some multiple of three left, then only take one, otherwise take two.

It's not so important to understand this logic, but we'd like the computer not to play too poorly else our small but fun Java game may not be as much well, fun. You can try out the game for yourself later to see if you think the computer is too easy. Last, we want to tell the player how many sticks the computer took, and then we also want to subtract the number of sticks it took. If the computer took the last stick, the player wins!

You can now try out your fun Java game! Make sure to type in y or Y so that you take your turn first. We haven't coded the game to work the other way yet! One last thing we should do before working on the computer going first: we need to make sure the player can only take away one or two sticks.

If you look at the code, what will happen if they decide they want 20 sticks? Nothing is stopping the player from doing so! This will ruin our Java game to no end!

To prevent this, we'll do some simple error checking and handling. If the player types a number less than one, we'll assume he or she meant one.

If he or she types in a number greater than two, we'll assume it to be two. And to add, no, Java for gaming is still an awful idea. For such simple graphics it needs a beast of a machine. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Why are only a few video games written in Java? Asked 12 years, 6 months ago. Active 6 years ago. Viewed k times. Sasha Chedygov. Sasha Chedygov Sasha Chedygov k 26 26 gold badges 98 98 silver badges bronze badges.

Yeah but most "real games" aren't made in managed. Runescape is written in java. Minecraft is written in Java! Show 7 more comments. Active Oldest Votes. Michael Madsen Michael Madsen Well obviously you wouldn't run Crysis on the JVM; hell, if you coded that game in assembly language you'd still need a supercomputer to run it on full settings. You can't compare Unreal Tournament 3 or Crysis with Runescape. If graphic quality is a concern, you need to stick with a low level language with as little overhead as possible.

There are only a handful of games I can think of that were created with graphics in mind I'm thinking of Crysis, but Half-Life 2 as well, at the time.

I don't think most game developers care that much about graphics, as long as they are "good enough" aka on par with most other games.

Graphics really have very little to do with the language. Physics, AI, yes. Graphics, no. JulianR there can be a significant workload for preparing and maintaining a scene to be rendered efficiently, so the language and associated language overhead does matter for graphics. Show 5 more comments. I think John Carmack said it best with: The biggest problem is that Java is really slow.

Sasha Chedygov k 26 26 gold badges 98 98 silver badges bronze badges. Marc Marc 2, 2 2 gold badges 18 18 silver badges 21 21 bronze badges. That quote was from Both Java technology and Cellphone power has considerably improved since then. Comparing cellphone gaming vs PC gaming is comparing apples to oranges.

John Carmack said it. Case closed. I just get uneasy when I read "Java is really slow". I agree that the above reasons are why Crysis and like-games are not written in Java. Chris Dail, this underscores the whole issue with Java performance. Has Java performance improved? No, cell phones just got faster. I find this dispute very strange. Some did good job, some didn't. No wonder Carmack was complaining about them. And it has some serious issues from my point of view.

Oracle's HotSpot VM is completely different from both cases. If people compare all these things, the only thing I can conclude is that they don't know what they are talking about. Show 10 more comments. Math shouldn't look like that. Welbog Welbog 57k 8 8 gold badges silver badges bronze badges.

I remember back in '96 I think it was, some of the designers from Sun were giving a presentation on Java at Berkeley. William Kahan en. Punish everyone else for a few bad apples? This is one reason I prefer C. If I really need operator overloading it is there.

Basically, operator overloading is only really appropriate for different situations in OOP design Vectors, Matrices, Complex numbers. Most other situations, it's too loosely defined and only leads to sloppy code, weak syntax, and poor documentation, even from people who know how to use it. I think that's why Sun opted to not use it in Java, and I think that's a valid decision.

MMJZ: What do lambda expressions have to do with operator overloading? Show 6 more comments. Joel Martinez Joel Martinez XNA also makes it possible to deploy your. NET application to XBox. I haven't seen anything quite that smooth for Java. You can also deploy to the Zune as well. Article Contributed By :. Easy Normal Medium Hard Expert. Writing code in comment? Please use ide.

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