Dino Game in Java

In this article, we will create the famous Chrome Dino Game in Java with Swing. We all have played the Dino game in the browser when the internet goes off. It’s a simple game where the player must keep the dinosaur safe from hitting obstacles by jumping over them.

Features

The dinosaur can jump by pressing the Enter key.
When the game is over, the player can restart it by pressing the Space bar key.

Code for Dino Game in Java

Create a folder for the project with a name of your choice. Create a file within this folder with the name dino.java. Please copy and paste the below code and run it.

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.Frame;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
import javax.swing.AbstractAction;
import javax.swing.ActionMap;
import javax.swing.InputMap;
import javax.swing.JPanel;
import javax.swing.KeyStroke;
import javax.swing.Timer;
import java.awt.event.KeyListener;

class Game extends Frame implements KeyListener{
	final int D_W = 1200;
	final int D_H = 550;
	static int unit = 10;
	Color colorDinosaur = Color.GRAY;
	Color colorGameOver1 = Color.black;
	Color colorGameOver2 = Color.yellow;
	Color colorCactus1 = Color.gray; 
	Color colorCactus2 = Color.gray;
	int jump = 0;
	int jumpY = 0;
	int y = 0;
	boolean onEnterPresses = false;
	boolean down = false;
	List<MyGraph> myGraphs = new ArrayList<>();
	int currentDinosaurX = 0;
	int currentDinosaurY = 0;
	boolean gameOver = false;
	DrawPanel drawPanel = new DrawPanel(); 
	public static  void main(String args[]) {
		new Game();
	}

	public Game() {
		super("Run Dino Run");
		setSize(1200, 550); // set the size of the window
		setVisible(true);
		addWindowListener(new WindowAdapter() {
			public void windowClosing(WindowEvent e) {
				dispose();
				System.exit(0);
			}
		});

		addKeyListener(this);
		initCactusG();

		ActionListener listener = new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				if (!gameOver) {
					if (jump >= D_W) {
						jump = 0;
						initCactusG();
						drawPanel.repaint();
					} else {
						jump += 10;
						drawPanel.repaint();
					}
				}
			}
		};

		Timer timer = new javax.swing.Timer(40, listener);
		timer.start();
		ActionListener listenerD = new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				if (!gameOver) {
					if (onEnterPresses) {
						if (down) {
							jumpY -= 20;
						} else {
							jumpY += 20;
						}
					}
					if (jumpY >= 280) {
						down = true;
					}
					if (jumpY <= 0) {
						onEnterPresses = false;
						down = false;
						jumpY = 0;
					}
				}
			}
		};
		Timer timerD = new javax.swing.Timer(80, listenerD);
		timerD.start();
		add(drawPanel);
		pack();
		// setDefaultCloseOperation(EXIT_ON_CLOSE);
		setLocationRelativeTo(null);
		setVisible(true);
	}

	// create the cactus on random positions
	private void initCactusG() {
		Random rr = new Random();
		int nbr = 2;// rr.nextInt(2)+1 ;;
		int x_ = 10;
		int y_ = 100;
		int h_ = 60;
		int p_ = 10;
		myGraphs = new ArrayList<Game.MyGraph>();
		for (int it = 0; it < nbr; it++) {
			Random r = new Random();
			int step = r.nextInt(10) + 1;
			MyGraph myGraph = new MyGraph();
			myGraph.x_ = x_ * 30 + step * 10 + 600;
			myGraph.h_ = 10 + (6 * step) + 2;
			myGraph.y_ = 300 - h_;
			myGraph.p_ = 8 + step / 2;
			myGraphs.add(myGraph);
		}
	}

	// draw the cactus
	private void drawCactus(Graphics g) {
		int x = 0;
		int y = 0;
		int h = 0;
		int p = 0;
		for (MyGraph myGraph : myGraphs) {
			x = myGraph.x_;
			h = myGraph.h_;
			y = myGraph.y_;
			p = myGraph.p_;
			int maxH = 180;
			int i = p * 2 + 40;
			int j = p * 2 + 40;
			int y1 = y + 40;
			int y2 = y + 60;
			if (x + j - jump < 0) {
				jump = 0;
			}
			draw(g, x - i - jump, y1, h, p);
			draw(g, x - jump, y, maxH, p * 2);
			draw(g, x + j - jump, y2, h, p);
			drow2(g, x - jump, h, p, i, j, y1, y2);
		}
	}

	// on game over draw the game over text
	private void gameOver(Graphics g) {
		Graphics2D graph = (Graphics2D) g;
		graph.setPaint(colorGameOver1);
		graph.setFont(new Font("MV Boli", 20, 50));
		graph.drawString("Game Over", 550, 150);

		//restart
		Graphics2D graph1 = (Graphics2D) g;
		graph1.setPaint(colorGameOver1);
		graph1.setFont(new Font("MV Boli", 20, 50));
		graph1.drawString("Press Space key to restart!!", 350, 250);
	}

	// restart the game
	private void restartGame(Graphics g) {
		new Game();
	}

	// draw the sun on the sky
	private void drawSun(Graphics g) {
		Graphics2D sun1 = (Graphics2D) g;
		sun1.setPaint(new Color(255, 255, 0));
		sun1.fillArc(900, 70, 80, 80, 90, 180);
		Graphics2D sun2 = (Graphics2D) g;
		sun2.setPaint(new Color(255, 255, 153));
		sun2.fillArc(900, 70, 80, 80, 270, 180);
	}

	// draw the cactus
	private void drow2(Graphics g, int x, int h, int p, int i, int j, int y1, int y2) {
		Graphics2D gsds = (Graphics2D) g;
		gsds.setPaint(colorCactus1);
		gsds.fillRect(x - i + p, y1 + h, i, p);
		Graphics2D gsdds = (Graphics2D) g;
		gsdds.setPaint(colorCactus2);
		gsdds.fillRect(x - i + 2 * p, y1 + h - p, i - 2 * p, p);
		Graphics2D gsd2 = (Graphics2D) g;
		gsd2.setPaint(colorCactus2);
		gsd2.fillRect(x + p * 2, y2 + h, j - p, p);
		Graphics2D gsd3 = (Graphics2D) g;
		gsd3.setPaint(colorCactus1);
		gsd3.fillRect(x + p * 4, y2 + h - p, j - 4 * p, p);
	}

	// draw the surface
	private void drawSol(Graphics g, int x, int y, int maxH) {
		Graphics2D sol = (Graphics2D) g;
		sol.setPaint(Color.orange);
		sol.fillRect(0, y + maxH - 20, 1700, 100);
	}

	// draw the dinausor
	private void drawDinausor(Graphics g, int y) {
		int xDinausor = 180;
		int step = 1;
		g.setColor(colorDinosaur);
		currentDinosaurX = xDinausor;
		currentDinosaurY = y;
		drawRaw(g, xDinausor, y, 2, 1);
		drawRaw(g, xDinausor + 4 * unit, y, 2, 1);
		drawRaw(g, xDinausor, y - step * unit, 1, 1);
		drawRaw(g, xDinausor + 4 * unit, y - step * unit, 1, 1);
		step++;
		drawRaw(g, xDinausor, y - step * unit, 2, 1);
		drawRaw(g, xDinausor + 3 * unit, y - step * unit, 2, 1);
		step++;
		drawRaw(g, xDinausor, y - step * unit, 5, 1);
		step++;
		drawRaw(g, xDinausor - unit, y - step * unit, 6, 1);
		step++;
		drawRaw(g, xDinausor - 2 * unit, y - step * unit, 8, 1);
		step++;
		drawRaw(g, xDinausor - 3 * unit, y - step * unit, 10, 1);
		step++;
		drawRaw(g, xDinausor - 4 * unit, y - step * unit, 11, 1);
		drawRaw(g, xDinausor + (11 + 1 - 4) * unit, y - step * unit, 1, 1);
		step++;
		drawRaw(g, xDinausor - 4 * unit, y - step * unit, 3, 1);
		drawRaw(g, xDinausor + (5 - 4) * unit, y - step * unit, 8, 1);
		step++;
		drawRaw(g, xDinausor - 4 * unit, y - step * unit, 2, 1);
		drawRaw(g, xDinausor + (6 - 4) * unit, y - step * unit, 5, 1);
		step++;
		drawRaw(g, xDinausor - 4 * unit, y - step * unit, 1, 1);
		drawRaw(g, xDinausor + (7 - 4) * unit, y - step * unit, 4, 1);
		step++;
		drawRaw(g, xDinausor - 4 * unit, y - step * unit, 1, 1);
		drawRaw(g, xDinausor + (8 - 4) * unit, y - step * unit, 7, 1);
		step++;
		drawRaw(g, xDinausor + (8 - 4) * unit, y - step * unit, 4, 1);
		step++;
		drawRaw(g, xDinausor + (8 - 4) * unit, y - step * unit, 8, 1);
		step++;
		drawRaw(g, xDinausor + (8 - 4) * unit, y - step * unit, 2, 1);
		drawRaw(g, xDinausor + (11 - 4) * unit, y - step * unit, 5, 1);
		step++;
		drawRaw(g, xDinausor + (8 - 4) * unit, y - step * unit, 8, 1);
		step++;
		drawRaw(g, xDinausor + (9 - 4) * unit, y - step * unit, 6, 1);
		step++;
	}

	private void drawRaw(Graphics g, int Dinausor, int y, int w, int h) {
		Graphics2D sun16 = (Graphics2D) g;
		sun16.fillRect(Dinausor, y, w * unit, h * unit);
	}

	private void draw(Graphics g, int x, int y, int h, int p) {
		if (x <= currentDinosaurX && x + p >= currentDinosaurX && y <= currentDinosaurY) {
			gameOver(g);
			gameOver = true;
			return;
		}
		Graphics2D gcd = (Graphics2D) g;
		// Green 0 -204- 0
		gcd.setPaint(colorCactus1);
		gcd.fillRect(x, y, p, h);
		Graphics2D gsd = (Graphics2D) g;
		// Very dark green 0 -102- 0
		gsd.setPaint(colorCactus2);
		gsd.fillRect(x + p, y, p, h);
		Graphics2D gssd = (Graphics2D) g;
		// Very dark green 0 -102- 0
		gssd.setPaint(colorCactus2);
		gssd.fillArc(x, y - p, p * 2, p * 2, 1, 90);
		Graphics2D gzssd = (Graphics2D) g;
		gzssd.setPaint(colorCactus1);
		gzssd.fillArc(x, y - p, p * 2, p * 2, 90, 90);
		Graphics2D ghssd = (Graphics2D) g;
		ghssd.setPaint(colorCactus1);
		ghssd.fillArc(x, y + h - p, p * 2, p * 2, 180, 90);
		Graphics2D ghzssd = (Graphics2D) g;
		ghzssd.setPaint(colorCactus2);
		ghzssd.fillArc(x, y + h - p, p * 2, p * 2, 270, 90);
	}

	private class DrawPanel extends JPanel {
		public DrawPanel() {
			MoveAction action = new MoveAction("onEnter");
			String ACTION_KEY = "onEnter";
			KeyStroke W = KeyStroke.getKeyStroke(KeyEvent.VK_ENTER, 0);
			InputMap inputMap = getInputMap(WHEN_IN_FOCUSED_WINDOW);
			inputMap.put(W, ACTION_KEY);
			ActionMap actionMap = getActionMap();
			actionMap.put(ACTION_KEY, action);
		}
		protected void paintComponent(Graphics g) {
			super.paintComponent(g);
			drawCactus(g);
			drawSun(g);
			drawSol(g, 100, 250, 180);
			drawDinausor(g, 400 - jumpY);
			if (gameOver) {
				gameOver(g);
			}
		}
		public Dimension getPreferredSize() {
			return new Dimension(D_W, D_H);
		}
	}

	private class MyGraph {
		int x_ = 10;
		int y_ = 100;
		int h_ = 60;
		int p_ = 10;
	}

	class MoveAction extends AbstractAction {
		public MoveAction(String name) {
			putValue(NAME, name);
		}
		public void actionPerformed(ActionEvent actionEvent) {
			onEnterPresses = true;
			drawPanel.repaint();
		}
	}

	@Override
	public void keyTyped(KeyEvent e) {
		// TODO Auto-generated method stub
	}

	@Override
	public void keyPressed(KeyEvent e) {
		if(e.getKeyCode() == KeyEvent.VK_SPACE) {
			if(gameOver){
				gameOver = false;
				restartGame(getGraphics());
			}
		}	
	}

	@Override
	public void keyReleased(KeyEvent e) {
		// TODO Auto-generated method stub
	}
}

Output for Dino Game in Java

Image Output:

Video Output:

Conclusion

This ends our article on Dino Game in Java. I hope this was helpful and easy to follow. You must also check these projects to get a good hold of building applications in Java.

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