ライフゲームのJavaプログラム

import java.util.Random;

public class GameOfLife {
    private static final int SIZE = 10; // フィールドのサイズ
    private static final int GENERATIONS = 100; // 世代数

    private boolean[][] currentGeneration; // 現在の世代
    private boolean[][] nextGeneration; // 次の世代

    public GameOfLife() {
        currentGeneration = new boolean[SIZE][SIZE];
        nextGeneration = new boolean[SIZE][SIZE];
        initializeField();
    }

    public void run() {
        for (int i = 0; i < GENERATIONS; i++) {
            System.out.println("Generation " + (i + 1) + ":");
            printField(currentGeneration);
            System.out.println();
            generateNextGeneration();
            swapGenerations();
        }
    }

    private void initializeField() {
        Random random = new Random();
        for (int i = 0; i < SIZE; i++) {
            for (int j = 0; j < SIZE; j++) {
                currentGeneration[i][j] = random.nextBoolean();
            }
        }
    }

    private void generateNextGeneration() {
        for (int i = 0; i < SIZE; i++) {
            for (int j = 0; j < SIZE; j++) {
                int liveNeighbors = countLiveNeighbors(i, j);
                nextGeneration[i][j] = (liveNeighbors == 3) || (liveNeighbors == 2 && currentGeneration[i][j]);
            }
        }
    }

    private int countLiveNeighbors(int row, int col) {
        int count = 0;
        for (int i = -1; i <= 1; i++) {
            for (int j = -1; j <= 1; j++) {
                if (i == 0 && j == 0) {
                    continue;
                }
                int neighborRow = (row + i + SIZE) % SIZE;
                int neighborCol = (col + j + SIZE) % SIZE;
                if (currentGeneration[neighborRow][neighborCol]) {
                    count++;
                }
            }
        }
        return count;
    }

    private void swapGenerations() {
        boolean[][] temp = currentGeneration;
        currentGeneration = nextGeneration;
        nextGeneration = temp;
    }

    private void printField(boolean[][] field) {
        for (int i = 0; i < SIZE; i++) {
            for (int j = 0; j < SIZE; j++) {
                System.out.print(field[i][j] ? "■" : "□");
            }
            System.out.println();
        }
    }

    public static void main(String[] args) {
        GameOfLife game = new GameOfLife();
        game.run();
    }
}