wia/code/EscapeJava.java

import java.util.Arrays;

public class EscapeJava {

    public static final int TIMES = 100;
    public static final int SAMPLES = 100;


    public static void main(String[] args) {

        double[] collectedTimes = new double[TIMES];

        for (int i = 0; i < TIMES; i++) {
            long[] samples = new long[SAMPLES];
            for (int j = 0; j < SAMPLES; j++) {
                long start = System.nanoTime();

                int[][] a = calculate(generateGrid(i), i);

                long end = System.nanoTime();

                long elapsed = end - start;
                samples[j] = elapsed;
            }
            collectedTimes[i] = Arrays.stream(samples).mapToDouble(v -> v/10e9).min().orElse(-1);
        }
        Arrays.stream(collectedTimes).forEach(System.out::print);
    }

    public static int escape(double cx, double cy, int maximum, double bounds) {
        int i = 0;
        double x = 0;
        double y = 0;

        while (Math.sqrt(x * x + y * y) < bounds && i < maximum) {
            y = 2 * x * y + cy;
            x = x * x - y * y + cx;
            i++;
        }
        return i;
    }

    static class Complex {
        public double real;
        public double imag;

        Complex(double real, double imag) {
            this.real = real;
            this.imag = imag;
        }
    }

    public static Complex[][] generateGrid(int n) {
        Complex[][] grid = new Complex[n][n];
        for (int yi = 0; yi < n; yi++) {
            for (int xi = 0; xi < n; xi++) {
                double cx = -2.0 + (4.0/n) * xi;
                double cy = -2.0 + (4.0/n) * yi;

                grid[yi][xi] = new Complex(cx, cy);
            }
        }
        return grid;
    }

    public static int[][] calculate(Complex[][] grid, int n) {
        int[][] results = new int[n][n];
        for (int yi = 0; yi < n; yi++) {
            for (int xi = 0; xi < n; xi++) {
                Complex c = grid[yi][xi];
                results[yi][xi] = escape(c.real, c.imag, 10, 2);
            }
        }
        return results;
    }
}