Good job! I can really relate to your comment. The feeling you get when you finally figure something out by yourself is truly special. Hope you'll keep enjoying coding.

Hii ..can you please tell me where you did mistake, cause mine also not working..that rectangle is not moving

@@barsapriyadarshinijena2084 Hey. There was one line of code that wasi missing in my game loop connecting everything together. It's pretty unlikely that you have exactly the same fault. I would recommend to check your code for errors (underlined in red etc.) and after that you compare your code line for line with the tutorial. It's gonna take a while but you are gonna find the problem I'm sure. Keep searching 😇

me toooooooooo it was just so suffering but it turned out to run successfully

I am having some problems too my square did'nt appear and i can't initialize keyhandler

Thank you. That means a lot to me.

I can relate to that!

I m loving the tutorial!

Thank you for this! I initially tried grouping the relative & visible methods with the others at the top of the class for appearance sake and could not for the life of me figure out why keyListener sometimes worked but most of the time did not. This fixed it for me! Much appreciated!

Oh my god, thank you so much. I was about to quit and decided to look at the comments before quitting. You're a hero.

Dude you're such a lifesaver thank god you fixed so many problems bless you

thnks broski

I had missed adding startGameThread to the Main class and it was driving me nuts. Thank you for the tip!

It took me a while to understand game loop

Hey can you pls help with my code i can't get the rectangle to move..... Sorry for replying to a 2 year old vid. Also, I am using Vs code java package so i don't have to write package main at the top //Main.java import javax.swing.JFrame; public class Main { public static void main(String[] args) { JFrame window = new JFrame(); window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); window.setResizable(false); window.setTitle("GameXD"); GamePanel gamePanel = new GamePanel(); window.add(gamePanel); window.pack(); window.setLocationRelativeTo(null); window.setVisible(true); gamePanel.startGameRun(); } } //GamePanel.java import java.awt.Color; import java.awt.Dimension; import java.awt.Graphics; import java.awt.Graphics2D; import javax.swing.JPanel; public class GamePanel extends JPanel implements Runnable{ final int originalTileSize = 16; final int scale = 3; final int tileSize = originalTileSize * scale; final int maxScreenCol = 16; final int maxScreenRow = 12; final int screenWidth = maxScreenCol * tileSize; final int screenHeight = maxScreenRow * tileSize; InputHandler inputManager = new InputHandler(); Thread gameThread; int playerX = 100; int playerY = 100; int playerSpeed = 4; public GamePanel() { this.setPreferredSize(new Dimension(screenWidth,screenHeight)); this.setBackground(Color.black); this.setDoubleBuffered(true); this.addKeyListener(inputManager); this.setFocusable(true); } public void startGameRun() { gameThread = new Thread(); gameThread.start(); } @Override public void run() { while(gameThread != null){ long currentTime = System.nanoTime(); System.out.println("Current Time:"+currentTime); update(); repaint(); } } public void update() { if(inputManager.upPressed == true) { playerY -= playerSpeed; } if(inputManager.downPressed == true) { playerY += playerSpeed; } if(inputManager.leftPressed == true) { playerX -= playerSpeed; } if(inputManager.rightPressed == true) { playerX += playerSpeed; } } public void paintComponent(Graphics g) { super.paintComponent(g); Graphics2D g2 = (Graphics2D)g; g2.setColor(Color.white); g2.fillRect(playerX, playerY, tileSize, tileSize); g2.dispose(); } } //InputHandler.java import java.awt.event.KeyEvent; import java.awt.event.KeyListener; public class InputHandler implements KeyListener{ public boolean upPressed = false; public boolean downPressed = false; public boolean leftPressed = false; public boolean rightPressed = false; @Override public void keyPressed(KeyEvent e) { int keyCode = e.getKeyCode(); if(keyCode == KeyEvent.VK_W) { upPressed = true; } if(keyCode == KeyEvent.VK_S) { downPressed = true; } if(keyCode == KeyEvent.VK_A) { leftPressed = true; } if(keyCode == KeyEvent.VK_D) { rightPressed = true; } } @Override public void keyReleased(KeyEvent e) { int keyCode = e.getKeyCode(); if(keyCode == KeyEvent.VK_W) { upPressed = false; } if(keyCode == KeyEvent.VK_S) { downPressed = false; } if(keyCode == KeyEvent.VK_A) { leftPressed = false; } if(keyCode == KeyEvent.VK_D) { rightPressed = false; } } @Override public void keyTyped(KeyEvent e) { //Don't use } }

please dont cut things even if its something small as importing something. if this is for complete beginners, dont cut things out even if its something as importing

@@adhyyankumar501sorry for replying on 9 month old comment, hope you already solved it yourself, but if not then you can try this in startGameRun() method new Thread(this);

Glad to hear that you liked it. Hope you enjoy developing your own game!

Same, I’m a computer science student and finished my first year with Java. Figured this would be a good project. Definitely helps if you know how classes, data types, methods, loops, etc works

ありがとうございます！　学習の一助になったのであれば幸いです。日本人でコメントしてくださる方は少ないので非常に嬉しいです。異国での生活はなにかと大変なこともあるかと思いますが、どうぞ貴重な機会を存分にお楽しみください！

It took a while to make this video so I'm very happy to hear that. Thank you for the comment!

Man thank you so much :D🙏

Thankx! I could not figure out why my code did not work, but the TAB did the trick (probbably it is somehow needed to really focus on the panel)

Thank you soooo much

Thanks a lot.

thank you soo much I was getting really worried

Glad to hear that!

My friends, search for your life purpose, why are we here?? I advise you to watch this series and this video 👇 as a beginning to know the purpose of your existence in this life kzfaq.info/sun/PLPqH38Ki1fy3EB-8xmShVqpbQw99Do2B- kzfaq.info/get/bejne/bcphaaahvNaRn58.html

Thanks! It was really helpful

Thanks a lot, it was lagging for the first second of holding a key

btw it's better to use Canvas that is actually made for such things instead of JPanel that should actually be top container for the game display (Canvas), not the display itself. @@laz3664

Glad you liked it and thank you so much for your kind support :D

Thank you for supporting this channel! Greatly appreciate it.

also, whichever part in the if else statement comes first will take priority, meaning if you are pressing W and S, you will go up because the code checks W first.

I have the same issue, its white and not runnig well. Did u find any solution?

@@camilazcr1939 fixed it soon after i made the comment, and I completely forgot how lmao, sorry

@@camilazcr1939 I had this problem too . Look at the ( super.paintcomponent(g) ) Perhaps you add a extra ‘s’ after paintcomponent

holy shit thank you for this ive been having the exact problem lmao

😁❤

Still not working dude

did u fix it?

I believe the delta loop is FAR more accurate. After implementing the delta loop, using my 144hz monitor and setting the FPS attribute to 144 instead of 60, I noticed a MASSIVE difference between this and the sleep loop when it came to my red box's movement. Before it felt very jittery and almost looked like my monitor had ghosting issues, but after using the delta loop which had no influence on the concurrency of the program's thread, I can see my character moving as smoothly as any game I normally play on my computer.

Thanks! 😃

same problem here, any solution?

if the keys are not responding use this.requestFocusInWindow(); at the very end of your run method

@@boywonder_YT thank you so much, it worked

@@boywonder_YT like? im having same problem, how can i code this?(where)

Imagine that the Delta variable tracks the difference between the current time and last time, and when it reaches the draw interval we know enough time has passed so we run the updates. Now imagine you divide everything by the draw interval. The maximum value of Delta is now 1 (something divided by itself is 1), and the difference between the current time and last time is also a fraction of delta. Instead of Delta eventually adding up to that difference, it just adds up to 1 instead. As far as I can tell you can also implement the Delta method without the division. I hope this was helpful!

@@sparklecharmerthank you very much for your input!

So when I start it, it shows just a black panel without anything

I have the same issue, where yo able to fix it?

my code: MAIN------------------- package main; import javax.swing.JFrame; public class Main { public static void main(String[] args) { JFrame window = new JFrame(); window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); window.setResizable(false); window.setTitle("2D Adventure"); GamePanel gamePanel = new GamePanel(); window.add(gamePanel); window.pack(); window.setLocationRelativeTo(null); window.setVisible(true); gamePanel.startGameThread(); } } Game Panel---------------------------- package main; import java.awt.Color; import java.awt.Dimension; import java.awt.Graphics; import java.awt.Graphics2D; import javax.swing.JPanel; public class GamePanel extends JPanel implements Runnable{ //SCREEN SETTINGS final int originalTileSize = 16; //16 x 16 tile final int scale = 3; final int tileSize = originalTileSize * scale;//48 x 48 tile final int maxScreenCol = 16; final int maxScreenRow = 12; final int screenWidth = tileSize * maxScreenCol; final int screenHieght = tileSize * maxScreenRow; //FPS int FPS = 60; KeyHandler keyH = new KeyHandler(); Thread gameThread; //players default position int playerX = 100; int playerY = 100; int playerSpeed = 4; public GamePanel() { this.setPreferredSize(new Dimension(screenWidth, screenHieght)); this.setBackground(Color.black); this.setDoubleBuffered(true); this.addKeyListener(keyH); this.setFocusable(true); } public void startGameThread() { gameThread = new Thread(this); gameThread.start(); } @Override // SLEEP METHOD -> // public void run() { // double drawInterval = 1000000000/FPS; // double nextDrawTime = System.nanoTime() + drawInterval; // while(gameThread != null) { //System.out.println(("Program Running")); // 1 UPDATE: update information such as the characters positions // update(); // 2 Draw: draw the screen with the updated information // repaint(); // try { // double remainingTime = nextDrawTime - System.nanoTime(); // remainingTime = remainingTime/1000000; // // if(remainingTime < 0) { // remainingTime = 0; // } // // Thread.sleep((long)remainingTime); // // nextDrawTime += drawInterval; // // } catch (InterruptedException e) { // // TODO Auto-generated catch block // e.printStackTrace(); // } // } // } // DELTA METHOD-> public void run() { double drawInterval = 1000000000/FPS; double delta = 0; long lastTime = System.nanoTime(); long currentTime; long timer = 0; int drawCount = 0; while(gameThread != null) { currentTime = System.nanoTime(); delta += (currentTime - lastTime) / drawInterval; timer += (currentTime - lastTime); lastTime = currentTime; if(delta >= 1) { update(); repaint(); delta--; drawCount++; } if(timer >= 1000000000) { System.out.println("FPS:" + drawCount); drawCount = 0; } } } public void update() { if(keyH.upPressed == true) { playerY -= playerSpeed; System.out.println("up pressed"); } else if(keyH.downPressed == true) { playerY += playerSpeed; System.out.println("down pressed"); } else if(keyH.leftPressed == true) { playerX -= playerSpeed; System.out.println("left pressed"); } else if(keyH.rightPressed == true) { playerX += playerSpeed; System.out.println("right pressed"); } } public void paintComponent(Graphics g) { super.paintComponent(g); Graphics2D g2 = (Graphics2D)g; g2.setColor(Color.white); g2.fillRect(playerX, playerY, tileSize, tileSize); g2.dispose(); } } KEY HANDLER------- package main; import java.awt.event.KeyEvent; import java.awt.event.KeyListener; public class KeyHandler implements KeyListener{ public boolean upPressed, downPressed, leftPressed, rightPressed; @Override public void keyTyped(KeyEvent e) {} @Override public void keyPressed(KeyEvent e) { int code = e.getKeyCode(); if(code == KeyEvent.VK_W);{ upPressed = true; } if(code == KeyEvent.VK_S);{ downPressed = true; } if(code == KeyEvent.VK_A);{ leftPressed = true; } if(code == KeyEvent.VK_D);{ rightPressed = true; } } @Override public void keyReleased(KeyEvent e) { int code = e.getKeyCode(); if(code == KeyEvent.VK_W);{ upPressed = false; } if(code == KeyEvent.VK_S);{ downPressed = false; } if(code == KeyEvent.VK_A);{ leftPressed = false; } if(code == KeyEvent.VK_D);{ rightPressed = false; } } }

Check your KeyHandler and make sure there is no unnecessary ; in the if statement.

@@RyiSnow it worked thank you so much ive been sitting here for like 4 hours lol

@@lofipixel I do not have any difference in KeyHandler and still having the same problem.