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In this part of the Java 2D games tutorial, we create a Java Snake game clone.Source code and images can be found at the author's GithubJava-Snake-Game repository.Advertisementsif(typeof ez_ad_units!='undefined')ez_ad_units.push([[728,90],'zetcode_com-box-3','ezslot_6',131,'0','0']);__ez_fad_position('div-gpt-ad-zetcode_com-box-3-0');SnakeSnake is an older classic video game. It was first created in late 70s.Later it was brought to PCs. In this game the playercontrols a snake. The objective is to eat as many apples as possible. Each timethe snake eats an apple its body grows. The snake must avoid the walls and itsown body. This game is sometimes called Nibbles.Development of Java Sname gameThe size of each of the joints of a snake is 10 px. The snake is controlled with thecursor keys. Initially, the snake has three joints. If the game is finished, the"Game Over" message is displayed in the middle of the board.
The B_WIDTH and B_HEIGHT constants determine the sizeof the board. The DOT_SIZE is the size of the apple and the dot ofthe snake. The ALL_DOTS constant defines the maximum numberof possible dots on the board (900 = (300*300)/(10*10)). The RAND_POSconstant is used to calculate a random position for an apple. TheDELAY constant determines the speed of the game.private final int x[] = new int[ALL_DOTS];private final int y[] = new int[ALL_DOTS];These two arrays store the x and y coordinates of all joints of a snake.private void loadImages() ImageIcon iid = new ImageIcon("src/resources/dot.png"); ball = iid.getImage(); ImageIcon iia = new ImageIcon("src/resources/apple.png"); apple = iia.getImage(); ImageIcon iih = new ImageIcon("src/resources/head.png"); head = iih.getImage();In the loadImages() method we get the images for the game.The ImageIcon class is used for displaying PNG images.
In the initGame() method we create the snake, randomly locatean apple on the board, and start the timer.private void checkApple() if ((x[0] == apple_x) && (y[0] == apple_y)) dots++; locateApple(); If the apple collides with the head, we increase the number of joints of the snake.We call the locateApple() method which randomly positions a new apple object.
In the move() method we have the key algorithm of the game. Tounderstand it, look at how the snake is moving. We controlthe head of the snake. We can change its direction with the cursor keys.The rest of the joints move one position up the chain. The second jointmoves where the first was, the third joint where the second was etc.
This code moves the joints up the chain.if (leftDirection) x[0] -= DOT_SIZE;This line moves the head to the left.In the checkCollision() method, we determine ifthe snake has hit itself or one of the walls.for (int z = dots; z > 0; z--) if ((z > 4) && (x[0] == x[z]) && (y[0] == y[z])) inGame = false; If the snake hits one of its joints with its head the game is over.
The game is finished if the snake hits the bottom of the board.Snake.javapackage com.zetcode;import java.awt.EventQueue;import javax.swing.JFrame;public class Snake extends JFrame public Snake() initUI(); private void initUI() add(new Board()); setResizable(false); pack(); setTitle("Snake"); setLocationRelativeTo(null); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); public static void main(String[] args) EventQueue.invokeLater(() -> JFrame ex = new Snake(); ex.setVisible(true); ); This is the main class. 2ff7e9595c
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