Applet Orchard

Java Programming: Let’s Build a Game #2

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In this video we finish up the back end work for our game and set up the GameObject class which will make the game a lot easier to work with later down the line. If you have any questions then be sure to leave a comment or contact me on twitter; realtutsgml. If you learned something then be sure to leave a like, comment, and favorite.

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46 responses to “Java Programming: Let’s Build a Game #2”

  1. Taras Karmalyk Avatar
    Taras Karmalyk

    In JetBrains, use Alt + Insert to generate Constructor, or getter or setter etc.

    Reply
  2. Scarlet Chiira Avatar
    Scarlet Chiira

    Is there a GitHub repository for this?

    Reply
  3. Why Not To Have Fun Avatar
    Why Not To Have Fun

    screw jedies, I'm a get(i)

    Reply
  4. xclimatexcoldxx Avatar
    xclimatexcoldxx

    What software is he using? I cant find any other way to run java except through the command prompt, which is stupid.

    Reply
  5. ThatDude 45 Avatar
    ThatDude 45

    And here I am 3 years later…
    MY COMPUTER DISPLAYS A WHITE WINDOW AND NOTHING ELSE!
    TF US GOING ON!

    Reply
  6. Zachary Young Avatar
    Zachary Young

    Do Ctrl+Shift+O to import packages that you need

    Reply
  7. Space Been Avatar
    Space Been

    is the code on this video available mine isn't working and I can't figure out why

    Reply
  8. spongebob 01 Avatar
    spongebob 01

    my squares wont move pls help

    Reply
  9. ThePanable Avatar
    ThePanable

    This is beautifully written code. You should be proud.

    Reply
  10. Spudly Avatar
    Spudly

    Great video thanks, really made it easy to get everything going!
    the only thing I find pretty funny is you gloss over things like inheritance and abstract classes, but then at 12:45 you completely explain the workings of a for loop.

    Reply
  11. Angel Supreme Avatar
    Angel Supreme

    guys try to watch this in 1.50 speed lol

    Reply
  12. erre4 Avatar
    erre4

    why is lagging so much? i'm using linux. how can i solve?

    Reply
  13. hayksmn Avatar
    hayksmn

    I know it's really late but why not use foreach loops? Seems easier that way.
    for (GameObject object:objects) {
    object.tick();
    }
    for (GameObject object:objects) {
    object.render(g);
    }

    Reply
  14. Matt Brown Avatar
    Matt Brown

    By any chance is source code on github?

    Reply
  15. Nikoloz Avatar
    Nikoloz

    i don't get who you're targeting at. previously you assume we know what a bufferstrategy is, but here you console us about the complexity of the idea of class constructor? and btw the code in run() method is not really that bad. it just ticks 60 times per sec and renders as many times as the parent while loop runs. and it updates FPS at most once per second

    Reply
  16. Alex Li Avatar
    Alex Li

    I don't see the point in using an enum. I don't really know what they are, but for all the purposes that you use it for, it would be more readable and easier to just use the command instanceof.
    (format : say you have an object named animal, you could type:
    if(animal instanceof horse){
    do stuff;
    }

    Reply
  17. Relic Zexide Avatar
    Relic Zexide

    hey guys if the programe isn't working you have 100% messed some where in the spelling like you did forget an i or did make an 'O' in the place of an 'o' re-read the programme 10 time if it isn't working

    Reply
  18. Breepable17 Avatar
    Breepable17

    I copied the render class word for word but in the game class I keep getting an error that says "Cannot instantiate the type Handler" any idea where the cause of the issue might be?

    Reply
  19. Tenji Lionel Avatar
    Tenji Lionel

    quick question about getters and setters in this instance, so are getters and setters basically like the universal config files for the different entites in the game? like having common variables between each entity like size and health?

    Reply
  20. TeaMMatE11 - Another Music Guy Avatar
    TeaMMatE11 – Another Music Guy

    So I created a new instance of handler, and Java doesn't seem to recognize the new instance, help anyone?

    Reply
  21. 9000643 Avatar
    9000643

    What if I wanted a delay in my tick? Instead of constant motion, move five pixels every time with a short delay in between?

    Reply
  22. Shachar Har-Shuv Avatar
    Shachar Har-Shuv

    the square was moving in a very low frame rate at the beginning, then I found out I can fix it if I make the "ns" argument in the game loop smaller than you did. Why is that? Does the speed of the game depend on the machine? This is not a wanted side effect… how do I specifically determine the frame rate of my game to be the same on each machine?

    Reply
  23. Shachar Har-Shuv Avatar
    Shachar Har-Shuv

    Correct me if I'm wrong = but get(i) in LinkedList takes O(i) time so you iteration through the list O(n^2) (when n is the size of the list). Isn't there a way to iterate through the list in linear time? like using iterators or pointers or something?
    (forgive me if I'm wrong I am a student of computer science and know more theory than practical programming)

    Reply
  24. Jay Lickert Avatar
    Jay Lickert

    my fps is like 200-300 is that okay

    Reply
  25. SauceBoss Avatar
    SauceBoss

    when I put handler.tick(); in it makes it so there are other errors, don't know what is going wrong. Thanks

    Reply
  26. Silas Eacret Avatar
    Silas Eacret

    Anyone know why when I create an enum it says: Project 'Game!' is not a J2SE 5.0 compliant project.

    Reply
  27. MESS WITH IT Avatar
    MESS WITH IT

    can't get the white box to show up pls halp!!!!!!!

    Reply
  28. Ikechi Nwankwo Avatar
    Ikechi Nwankwo

    I got the code working so the objects are moving but I dont understand how they are doing so. In the main method we create a new game which also creates a handler object. but can someone tell me where the tick and render methods are actually called?

    Reply
  29. Luke Hensley Avatar
    Luke Hensley

    when ever I add the line "x += velX" to the Player tick() method, the game wont show anything in the window, does anyone have a solution?

    Reply
  30. primaltare Avatar
    primaltare

    By the way, you REALLY need to take this slower. You neglect explaining stuff despite that being your advertising hook, and then you constantly say, "easy". I have adequate understanding of Java and I /still/ could barely follow you at some points.

    Reply
  31. primaltare Avatar
    primaltare

    When creating my ID enum, Player() was fine (despite not having a class created), but Enemy() gave me an error (This method requires a body instead of a semicolon). Any ideas on how to fix it?

    Reply
  32. K Parks Avatar
    K Parks

    Dude you just reminded me why I don't like java!! All of that code just to get your screen/canvas up and running !!!

    Reply
  33. John J1101 Avatar
    John J1101

    14:00 for(GameObject o:objects){o.tick();} (I used ArrayList, idk about LinkedList)

    Reply
  34. Limitless Avatar
    Limitless

    I just love your enthusiasm!

    Reply
  35. Adithya Ravindra Avatar
    Adithya Ravindra

    Handler.addObject isnt working for me

    Reply
  36. Stjerna er meg Avatar
    Stjerna er meg

    My squares are moving 45 degrees downards? Instead of moving straight to right?

    Reply
  37. devin blevins Avatar
    devin blevins

    I get nullpointerException each time I try to do velX = r.nextInt(5) + 1; but when I do just velX += 1; it has no problem running

    Reply
  38. Karan Rana Avatar
    Karan Rana

    where u made this game ,which software I also want to make my own app plz tell from java language

    Reply
  39. ⊆Roovy⊇ Avatar
    ⊆Roovy⊇

    Why don't make the class Handler static?

    Reply
  40. FredTheNerd Avatar
    FredTheNerd

    When i instantiate a new instance of handler in the game class, the compiler asks me to implement all abstract methods, and when i do this, 3 methods are generated, which are called publish, flush, and close. I followed your tutorial though i have this error, someone please help me

    Reply
  41. George W. Kush Avatar
    George W. Kush

    Post everything in github, please.

    Reply
  42. Youssef Samwel Avatar
    Youssef Samwel

    Does anyone have the source code???

    Reply
  43. Kap3z1 Avatar
    Kap3z1

    15:52 As soon as I add "handler.tick();" there's errors. Could it have something to do with the word tick in the gameloop? Because if I remove the line "tick();" from my game loop there's no errors, but fps is halved.

    Exception in thread "Thread-2" java.lang.NullPointerException
    at com.tutorial.main.Game.tick(Game.java:70)
    at com.tutorial.main.Game.run(Game.java:53)
    at java.lang.Thread.run(Unknown Source)

    Reply
  44. John Bender Avatar
    John Bender

    to all who get the errors… check and make sure that you are importing properly. he is doing this without you guys noticing

    Reply
  45. John Bender Avatar
    John Bender

    you do things naturally that as someone who teaching needs to realize that and make sure you are not confusing others. There are things your doing without thinking and not mentioning them and it makes it difficult for others to understand the full tutorial, however you are doing really awesome.

    Reply
  46. haloanimates Avatar
    haloanimates

    18:09 Help! My shapes aren't moving!

    Reply

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