Simple Car Race Game in Java

   December 5, 2022
Car Race Game in Java

When it comes to building gaming applications, we always think of racing games as we loved playing these types of games in our childhood. So today in this article we will develop a Car Race Game in Java with Swing.

This game needs no explanation, but still has a bit of context for the game. The player’s car needs to race with the opponent’s cars without hitting any one of them and maintaining a high speed.

Project Overview: Car Race Game in Java

Project Name:Car Race Game in Java
Abstract:It’s a GUI-based project used with the swing library to organize all the elements that work under the Car Race Game.
Language Used:Java
IDE:VS Code
Java version (Recommended):Java SE 18.0. 2.1
Database:None
Type:Desktop Application
Recommended for:Beginners of Java
Time to build:1-2 hours

What will you learn? 

  • Building the logic of the game with the help of conditionals and loops
  • Learn the OOPs paradigm with the help of classes, objects, and inheritance
  • Creating an attractive User Interface with the help of Java Swing and Java AWT

Features

  • The player will be able to move the car left and right by pressing the left and right key
  • The Score and Speed of the car are updated continuously as the car moves ahead
  • If the car hits another car then the game is over and the player can restart the game by pressing Enter Key

Complete Code for Car Race Game in Java

First of all download the images for the project from here. Now, create a folder for the project and add all the images to this folder. Create a file named CarRace.java and copy the below line of code in that. Comments are provided for explanation.

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.io.IOException;
import java.util.Random;
import java.util.concurrent.TimeUnit;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.Timer;
// this class is used to build the graphics and the game logic
class CarGame extends JFrame implements KeyListener,ActionListener
{
    private int xpos=300; // x position of the car 
    private int ypos=700; // y position of the car
    private ImageIcon car; // car image 
    private Timer timer; // timer to update the screen
    Random random=new Random(); // random number generator
    
    private int num1=400,num2=0,num3=0; // x position of the obstacles
    private int tree1ypos=400,tree2ypos=-200,tree3ypos=-500,tree4ypos=100,tree5ypos=-300,tree6ypos=500; // y position of the obstacles 
    private int roadmove=0; // y position of the road
    private int carxpos[]={100,200,300,400,500}; // x position of the car
    private int carypos[]= {-240,-480,-720,-960,-1200}; // y position of the car
    private int cxpos1=0,cxpos2=2,cxpos3=4; // x position of the car
    private int cypos1=random.nextInt(5),cypos2=random.nextInt(5),cypos3=random.nextInt(5); // y position of the car
    int y1pos=carypos[cypos1],y2pos=carypos[cypos2],y3pos=carypos[cypos3]; // y position of the car
    private ImageIcon car1,car2,car3; // car image
    private int score=0,delay=100,speed=90; // score,delay and speed of the game
    private ImageIcon tree1,tree2,tree3; // tree image
    private boolean rightrotate=false,gameover=false,paint=false; // boolean variables to control the game logic and the graphics
    
    // constructor to initialize the game
    public CarGame(String title)
    {
        super(title); // call the constructor of the parent class JFrame
        setBounds(300,10,700,700); // set the position and size of the frame
        setVisible(true); // make the frame visible
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // close the frame when the close button is clicked
        setLayout(null); // set the layout of the frame to null
        addKeyListener(this); // add the key listener to the frame
        setFocusable(true); // set the focus to the frame
        setResizable(false); // set the frame to be non resizable
        
    }
    // this method is used to paint the graphics on the screen 
    public void paint(Graphics g)
    {
        g.setColor(new Color(0X82CD47)); // set the color of the grass
        g.fillRect(0, 0, 700, 700);  // draw the grass
        g.setColor(new Color(0X9F8772)); // set the color of the road
        g.fillRect(90,0,10,700); // draw the road
        g.fillRect(600, 0, 10, 700); 
        g.fillRect(100, 0, 500, 700);
        
    // draw the road lines 
    if(roadmove==0)
    {
        for(int i=0; i<=700; i+=100) 
        {   // draw the road lines
            g.setColor(Color.white);
            g.fillRect(350, i,10, 70); // 
    
        }
        roadmove=1; // set the roadmove to 1
    }
    else if(roadmove==1)
    { // draw the road lines again for the next frame
        for(int i=50; i<=700; i+=100)
        {
            g.setColor(Color.white);
            g.fillRect(350, i,10, 70);
        }
        roadmove=0; // set the roadmove to 0
    }
    
    try {
        tree1=new ImageIcon(ImageIO.read(getClass().getResource("tree.png"))); // load the tree image
    } catch (IOException e) {
        e.printStackTrace();
    }
    
    try {
        tree2=new ImageIcon(ImageIO.read(getClass().getResource("tree.png"))); // load the tree image
    } catch (IOException e) {
        e.printStackTrace();
    }
    try {
        tree3=new ImageIcon(ImageIO.read(getClass().getResource("tree.png"))); // load the tree image
    } catch (IOException e) {
        e.printStackTrace();
    }
    tree1.paintIcon(this, g, 0, tree1ypos); // draw the tree image on the screen
    num1=random.nextInt(500); // generate a random number
    tree1ypos+=50; // increment the y position of the tree
    
    tree2.paintIcon(this, g, 0,tree2ypos ); // draw the tree image on the screen
    tree2ypos+=50; // increment the y position of the tree
    
    tree3.paintIcon(this,g,0,tree3ypos); // draw the tree image on the screen
    tree3ypos+=50; // increment the y position of the tree
    tree1.paintIcon(this,g,600,tree4ypos);
    tree4ypos+=50;
    tree3.paintIcon(this, g,600,tree5ypos);
    tree5ypos+=50;
    tree2.paintIcon(this, g,600,tree6ypos);
    tree6ypos+=50;
    
        
    if(tree1ypos>700)
    { // if the tree goes out of the screen then reset the tree
        num1=random.nextInt(500); // generate a random number
        tree1ypos=-num1; // reset the y position of the tree
    }
    if(tree2ypos>700)
    { 
        num1=random.nextInt(500);
        tree2ypos=-num1;
    }
    if(tree3ypos>700)
    {
        num1=random.nextInt(500);
        tree3ypos=-num1;
    }
    if(tree4ypos>700)
    { // if the tree goes out of the screen then reset the tree
        num1=random.nextInt(500);
        tree4ypos=-num1;
    }
    if(tree5ypos>700)
    {
        num1=random.nextInt(500);
        tree5ypos=-num1;
    }
    if(tree6ypos>700)
    { // if the tree goes out of the screen then reset the tree
        num1=random.nextInt(500);
        tree6ypos=-num1;
    }
    
    
        // load image for car
        try {
            car=new ImageIcon(ImageIO.read(getClass().getResource("gamecar3.png"))); // load the car image 
        } catch (IOException e) {
            e.printStackTrace();
        }
    
        // car=new ImageIcon("gamecar1.png");
        car.paintIcon(this,g,xpos,ypos); // draw the car image on the screen
        
        ypos-=40;
        if(ypos<500)
        {
        ypos=500;   
        }
        
        // load the opponent image for car
        try {
            car1=new ImageIcon(ImageIO.read(getClass().getResource("gamecar1.png")));
        } catch (IOException e) {
                e.printStackTrace();
        }
        // load the opponent image for car
        try {
            car2=new ImageIcon(ImageIO.read(getClass().getResource("gamecar2.png")));
        } catch (IOException e) {
                e.printStackTrace();
        }
        // load the opponent image for car  
        try {
            car3=new ImageIcon(ImageIO.read(getClass().getResource("gamecar4.png")));
        } catch (IOException e) {
                e.printStackTrace();
        }
        
        car1.paintIcon(this, g, carxpos[cxpos1], y1pos); // draw the opponent car image on the screen
        car2.paintIcon(this, g, carxpos[cxpos2], y2pos); 
        car3.paintIcon(this, g, carxpos[cxpos3], y3pos);
        y1pos+=50; // increment the y position of the opponent car
        y2pos+=50;
        y3pos+=50;
        if(y1pos>700)
        { // if the opponent car goes out of the screen then reset the opponent car
            cxpos1=random.nextInt(5); // generate a random number
            cypos1=random.nextInt(5);   
            y1pos=carypos[cypos1]; // reset the y position of the opponent car
            
        }
        if(y2pos>700)
        { // if the opponent car goes out of the screen then reset the opponent car
            cxpos2++;
            if(cxpos2>4)
            { 
                cxpos2=0; 
            }
            
            cxpos2=random.nextInt(5);
            cypos2=random.nextInt(5);
            y2pos=carypos[cypos2];
            
        }
        if(y3pos>700)
        {
            cxpos3++;
            if(cxpos3>4)
            {
                cxpos3=0;
            }
            cxpos3=random.nextInt(5);
            cypos3=random.nextInt(5);
            y3pos=carypos[cypos3];
        }
    
        if(cxpos1==cxpos2 && cypos1>-100 && cypos2>-100)
        { 
            cxpos1-=1;
            if(cxpos1<0)
            {
                cxpos1+=2;
            }
        }
        if(cxpos1==cxpos3&& cypos1>-100 && cypos3>-100)
        {
            cxpos3-=1;
            if(cxpos3<0)
            {
                cxpos3+=2;
            }
        }
        if(cxpos2==cxpos3&& cypos3>-100 && cypos2>-100)
        {
            cxpos2-=1;
            if(cxpos2<0)
            {
                cxpos2+=2;
            }
        }
        if(cxpos1<2 && cxpos2<2 && cxpos3<2)
        {
            if(cxpos1==0 && cxpos2==0 && cxpos3==1)
            {
                cxpos3++;
                cxpos2++;
            }
            else if(cxpos1==0 && cxpos2==1 && cxpos3==0)
            {
                cxpos3++;
                cxpos2++;
            }
            else if(cxpos1==1 && cxpos2==0 && cxpos3==0)
            {
                cxpos1++;
                cxpos2++;
            }
        }
        
        // if the opponent car hits the player car then reset the game
        if(y1pos<ypos && y1pos+175>ypos && carxpos[cxpos1]==xpos)
        { 
        gameover=true;  
        }
        if(y2pos<ypos && y2pos+175>ypos && carxpos[cxpos2]==xpos)
        { 
        gameover=true;  
        }
        if(y3pos<ypos  && y3pos+175>ypos && carxpos[cxpos3]==xpos)
        {
        gameover=true;  
        }
        if(ypos<y1pos && ypos+175>y1pos && carxpos[cxpos1]==xpos)
        {
        gameover=true;  
        }
        if(ypos<y2pos && ypos+175>y2pos && carxpos[cxpos2]==xpos)
        {
        gameover=true;  
        }
        if(ypos<y3pos  && ypos+175>y3pos && carxpos[cxpos3]==xpos)
        {
        gameover=true;  
        }
        //score 
        g.setColor(Color.red);
        g.fillRect(120,35,220,50);
        g.setColor(Color.black);
        g.fillRect(125,40, 210, 40);
        g.setColor(Color.red);
        g.fillRect(385,35,180,50);
        g.setColor(Color.black);
        g.fillRect(390,40, 170, 40);
        g.setColor(Color.white);
        g.setFont(new Font("MV Boli",Font.BOLD,30));
        g.drawString("Score : "+score, 130, 67);
        g.drawString(speed+" Km/h", 400, 67);
        score++; // increment the score
        speed++; // increment the speed
        if(speed>140)
        { // if the speed is greater than 140 then reset the speed
            speed=240-delay; 
        
        }
        if(score%50==0)
        { // if the score is divisible by 50 then increase the delay
            delay-=10;
            if(delay<60)
            {
                delay=60; // set the delay to 60
            }
        }
        //delay 
        try
        {
            
            TimeUnit.MILLISECONDS.sleep(delay); // delay the game
        } 
        catch (InterruptedException e) {
            e.printStackTrace();
        }
        if(y1pos<ypos && y1pos+175>ypos && carxpos[cxpos1]==xpos)
        {
        gameover=true;  
        }
        if(y2pos<ypos && y2pos+175>ypos && carxpos[cxpos2]==xpos)
            
        {
        gameover=true;  
        }
        if(y3pos<ypos  && y3pos+175>ypos && carxpos[cxpos3]==xpos)
        {
        gameover=true;  
        }
        if(gameover)
        {
        g.setColor(Color.gray);
        g.fillRect(120, 210, 460, 200); 
        g.setColor(Color.DARK_GRAY);
        g.fillRect(130, 220, 440, 180);
        g.setFont(new Font("MV Boli",Font.BOLD,50));
        g.setColor(Color.red);
        g.drawString("Game Over !",210, 270);
        g.setColor(Color.white);
        g.setFont(new Font("MV Boli",Font.BOLD,30));
        g.drawString("Press Enter to Restart", 190, 340);
        if(!paint)
        {
            repaint();
            paint=true;
        }
        }
        else
        {
        repaint();
        }
    }
        
    public static void main(String args[])
    {
        CarGame c=new CarGame("Car Racing Game");
    }
    @Override
    public void keyPressed(KeyEvent e) {
        if(e.getKeyCode()==KeyEvent.VK_LEFT && !gameover)
        { // if the left key is pressed then move the car to the left
            xpos-=100;
            if(xpos<100)
            {
                xpos=100; // set the car to the left most position
            }
            
            
        }
        if(e.getKeyCode()==KeyEvent.VK_RIGHT&&!gameover)
        {   // if the right key is pressed then move the car to the right
            xpos+=100;
            if(xpos>500)
            {
                xpos=500; // if the car is at the right most position then don't move it
            }
        }
        if(e.getKeyCode()==KeyEvent.VK_ENTER && gameover)
        { // if the game is over and the enter key is pressed then restart the game
            gameover=false;     
            paint=false;
            cxpos1=0;
            cxpos2=2;
            cxpos3=4;
            cypos1=random.nextInt(5); // randomize the position of the opponent cars
            cypos2=random.nextInt(5); 
            cypos3=random.nextInt(5);
            y1pos=carypos[cypos1]; // set the position of the opponent cars
            y2pos=carypos[cypos2];
            y3pos=carypos[cypos3];
            speed=90; // set the speed to 90
            score=0; // set the score to 0
            delay=100; // set the delay to 100
            xpos=300; // set the position of the player car to the center
            ypos=700;    // set the position of the player car to the bottom
        }
    }
    @Override
    public void keyReleased(KeyEvent arg0) {
        // TODO Auto-generated method stub
    }
    @Override
    public void keyTyped(KeyEvent e) {
        if(e.getKeyChar()=='a'&&!gameover)
        { // if the key pressed is 'a' then move the car left
            xpos-=100; // decrement the xpos by 100
            
        }
        if(e.getKeyChar()=='s'&&!gameover)
        { // if the key pressed is 's' then move the car right
            xpos+=100; // increment the xpos by 100
        }
        
        repaint();
        
    }
    @Override
    public void actionPerformed(ActionEvent arg0) {}
}
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Output for Car Race Game in Java:

Image Output:

output for Car Race Game in Java

Video Output:

Video Player

Conclusion

Hope you enjoyed building the Car Race Game in Java as much as I enjoyed creating it for you!! We learned how to deal with collisions between different objects and re-rendering the object as they go out of view. You can try adding more functionalities like creating more obstacles in the way or to increase the difficulty of the game you can try increasing the speed of the car after each level.

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Author: Ayush Purawr