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class Maru {
  float d;
  float r;
  PVector position;
  PVector velocity;
  float hue;
  float sat;
 
  Maru(float x, float y, float vx, float vy, float d, float hue, float sat) {
    this.position = new PVector(x, y);
    this.velocity = new PVector(vx, vy);
    this.d = d;
    this.r = d/2;
    this.hue = hue;
    this.sat = sat;
  }
  void update() {
    position.add(velocity);
 
    if (position.x-d > width) {
      position.x = -d;
    }
  }
  void draw() {
    noStroke();
    fill(hue, sat, 100);
    ellipse(position.x, position.y, d, d);
  }
}
 
final int d = 50;
final float vx = 2;
final float vy = 0;
final int div = 10;
ArrayList<Maru> marus;
 
void setup() {
  size(400, 400);
  colorMode(HSB, 360, 100, 100);
 
  marus = new ArrayList<Maru>();
 
  float hue = 0;
  final float dh = 360/div;
  final float ds = 100/div;
 
  for (int j=0; j<div; j++) {
    final float y = j*d;
    float sat = 0;
 
    for (int i=0; i<div; i++) {
      final float x = i*d;
      marus.add(new Maru(x, y, vx, vy, d, hue, sat));
      sat += ds;
    }
    hue += dh;
  }
}
void draw() {
  background(0);
  for (Maru maru : marus) {
    maru.draw();
    maru.update();
  }
}
 

Main.java:31: error: class, interface, or enum expected
final int d = 50;
      ^
Main.java:32: error: class, interface, or enum expected
final float vx = 2;
      ^
Main.java:33: error: class, interface, or enum expected
final float vy = 0;
      ^
Main.java:34: error: class, interface, or enum expected
final int div = 10;
      ^
Main.java:35: error: class, interface, or enum expected
ArrayList<Maru> marus;
^
Main.java:37: error: class, interface, or enum expected
void setup() {
^
Main.java:39: error: class, interface, or enum expected
  colorMode(HSB, 360, 100, 100);
  ^
Main.java:41: error: class, interface, or enum expected
  marus = new ArrayList<Maru>();
  ^
Main.java:43: error: class, interface, or enum expected
  float hue = 0;
  ^
Main.java:44: error: class, interface, or enum expected
  final float dh = 360/div;
        ^
Main.java:45: error: class, interface, or enum expected
  final float ds = 100/div;
        ^
Main.java:47: error: class, interface, or enum expected
  for (int j=0; j<div; j++) {
  ^
Main.java:47: error: class, interface, or enum expected
  for (int j=0; j<div; j++) {
                ^
Main.java:47: error: class, interface, or enum expected
  for (int j=0; j<div; j++) {
                       ^
Main.java:48: error: class, interface, or enum expected
    final float y = j*d;
          ^
Main.java:49: error: class, interface, or enum expected
    float sat = 0;
    ^
Main.java:51: error: class, interface, or enum expected
    for (int i=0; i<div; i++) {
    ^
Main.java:51: error: class, interface, or enum expected
    for (int i=0; i<div; i++) {
                  ^
Main.java:51: error: class, interface, or enum expected
    for (int i=0; i<div; i++) {
                         ^
Main.java:52: error: class, interface, or enum expected
      final float x = i*d;
            ^
Main.java:53: error: class, interface, or enum expected
      marus.add(new Maru(x, y, vx, vy, d, hue, sat));
      ^
Main.java:54: error: class, interface, or enum expected
      sat += ds;
      ^
Main.java:55: error: class, interface, or enum expected
    }
    ^
Main.java:57: error: class, interface, or enum expected
  }
  ^
Main.java:61: error: class, interface, or enum expected
  for (Maru maru : marus) {
  ^
Main.java:63: error: class, interface, or enum expected
    maru.update();
    ^
Main.java:64: error: class, interface, or enum expected
  }
  ^
27 errors

Standard output is empty