Does this Processing code match properly with this Ardunio code?

example1.ino

int val;

void setup() {
  Serial.begin(9600);
  pinMode(3, INPUT);
}

void loop() {
  val = analogRead(0);
  Serial.write(val);
}

example1.pde

import processing.serial.*;

int val = 0; // To store data from serial port, used to color background
Serial port; // The serial port object

void setup() {
  size(200, 200);
  port = new Serial(this, Serial.list()[0], 9600);
}

void draw() {
  // Set the background
  background(val);
}

// Called whenever there is something available to read
void serialEvent(Serial port) {
  // Read the data
  val = port.read();
}

example2.ino

int val;

void setup() {
  Serial.begin(9600);
  pinMode(3, INPUT);
}

void loop() {
  // Only send out if something has come in
  if (Serial.available() > 0) {
    Serial.read();
    val = analogRead(0);
    Serial.write(val);
  }
}

example2.pde

import processing.serial.*;

int val = 0; // To store data from serial port, used to color background
Serial port; // The serial port object

void setup() {
  size(200, 200);
  port = new Serial(this, Serial.list()[0], 9600);
  port.write(65);
}

void draw() {
  background(val);
}

void serialEvent(Serial port) {
  val = port.read();
  // Request a new value
  port.write(65);
}

example3.ino

int sensor1 = 0;
int sensor2 = 0;
int sensor3 = 0;

void setup() {
  Serial.begin(9600);
  pinMode(3, INPUT);
}

void loop() {
  if (Serial.available() > 0) { // Only send if you have hear back
    Serial.read();
    sensor1 = analogRead(0);
    sensor2 = analogRead(1);
    sensor3 = analogRead(2);

    // Send the integer out as a string using print instead of write
    Serial.print(sensor1);
    // Send a comma -- ASCII code 44
    Serial.print(',');
    Serial.print(sensor2);
    Serial.print(',');
    Serial.print(sensor3);
    // Send an new line -- ASCII code 10
    Serial.print('\n');
  }
}

example3.pde

import processing.serial.*;

int r, g, b;   // Used to color background
Serial port; // The serial port object

void setup() {
  size(200, 200);
  port = new Serial(this, Serial.list()[0], 9600);
  // Request values right off the bat
  port.write(65);
}

void draw() {
  background(r, g, b);
}

// Called whenever there is something available to read
void serialEvent(Serial port) {
  // Read the data
  String input = port.readStringUntil('\n');
  if (input != null) {
    // Print message received
    println("Receiving: " + input);
    // Split up the string into an array of integers
    int[] vals = int(splitTokens(input, ",\n";));
    // Fill r,g,b variables
    r = vals[0];
    g = vals[1];
    b = vals[2];
  }
  // When finished ask for values again
  port.write(65);
}

Serial.print('\n');

It more common to write: Serial.println();

You can also add bufferUntil:

// set buffer full flag on receipt of a newline (println from Arduino).
// the serialEvent is only triggered when a newline is received.
serialPort.bufferUntil(10);