“Catch a drop” is a simple game that you can write in JAVA. This can be your first project for your portfolio.

To download the simple game, press Download.

You would need at least Java 11.

package ru.greklena;

import javax.imageio.ImageIO;
import javax.swing.*;
import java.awt.*;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.io.IOException;

public class GameWindow extends JFrame {

    private static GameWindow game_window;
    private static long last_frame_time;
    private static Image background;
    private static Image game_over;
    private static Image drop;
    private static float drop_left = 200;
    private static float drop_top = -100;
    private static float drop_v = 200;
    private static int score = 0;

    public static void main(String[] args) throws IOException {
        background = ImageIO.read(GameWindow.class.getResourceAsStream("background.jpg"));
        drop = ImageIO.read(GameWindow.class.getResourceAsStream("drop.png"));
        game_over = ImageIO.read(GameWindow.class.getResourceAsStream("game_over.jpg"));

        game_window = new GameWindow();
        game_window.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        game_window.setLocation(200, 100);
        game_window.setSize(900, 600);
        game_window.setResizable(false);
        last_frame_time = System.nanoTime();
        GameField game_field = new GameField();
        game_field.addMouseListener(new MouseAdapter() {
            @Override
            public void mousePressed(MouseEvent e) {
//                super.mousePressed(e);
                int x = e.getX();
                int y = e.getY();
                float drop_right = drop_left + drop.getWidth(null);
                float drop_bottom = drop_top + drop.getHeight(null);
                boolean is_drop = x>= drop_left && x<= drop_right && y>= drop_top && y<= drop_bottom;
                if (is_drop) {
                    drop_top = -100;
                    drop_left = (int) (Math.random() * (game_field.getWidth() - drop.getWidth(null)));
                    drop_v = drop_v + 20;
                    score++;
                    game_window.setTitle("Score: " + score);
                }
            }
        });
        game_window.add(game_field);
        game_window.setVisible(true);
    }

    private static void onRepaint (Graphics g) {
        long current_time = System.nanoTime();
        float delta_time = (current_time - last_frame_time) * 0.000000001f;
        last_frame_time = current_time;

        drop_top = drop_top + drop_v * delta_time;
        g.drawImage(background, 0, 0, null);
        g.drawImage(drop, (int) drop_left, (int) drop_top, null);
        if (drop_top > game_window.getHeight()) {
            g.drawImage(game_over, 150, 250, null);
        }

    }

    private static class GameField extends JPanel {

        @Override
        protected void paintComponent (Graphics g) {
            super.paintComponent(g);
            onRepaint(g);
            repaint();
        }
    }
}