Starter code (java).

experiments/starter_java/Main.java

+import javax.imageio.ImageIO;
+import java.awt.image.BufferedImage;
+import java.io.File;
+import java.io.IOException;
+
+public class Main {
+    static final int RESOLUTION = 256;
+    static BufferedImage image = new BufferedImage(RESOLUTION, RESOLUTION, BufferedImage.TYPE_INT_ARGB);
+
+    public static void main(String[] args) {
+        for (int y = 0; y < RESOLUTION; y++) {
+            for (int x = 0; x < RESOLUTION; x++) {
+                writePixel(x, y, 0, 0, 255, 255);
+            }
+        }
+
+        saveOutput("output.png");
+    }
+
+    static void writePixel(int x, int y, int r, int g, int b, int a) {
+        int rgba = (a << 24) | (r << 16) | (g << 8) | b;
+
+        image.setRGB(x, y, rgba);
+    }
+
+    static void saveOutput(String name) {
+        File file = new File(name);
+
+        try {
+            ImageIO.write(image, "png", file);
+        } catch (IOException e) {
+            System.out.println(e);
+        }
+    }
+}
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