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#include <Wire.h> 
#include <LiquidCrystal_I2C.h>

char inputBuffer[32 + 1];

LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup(){
  Serial.begin(9600);
  pinMode(ledPin, OUTPUT);
  lcd.init();
  lcd.backlight();
}

void loop(){
  if(Serial.available() > 0){
    lcd.print("                ");
    Serial.readBytesUntil('\n', inputBuffer, 32);
    lcd.setCursor(0, 0);
    lcd.print(inputBuffer);
    memset(inputBuffer, 0, sizeof(inputBuffer));
  }
}

#include <Wire.h> 
#include <LiquidCrystal_I2C.h>

char inputBuffer[32 + 1];

LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup(){
  Serial.begin(9600);
  lcd.init();
  lcd.backlight();
}

void loop(){
  if(Serial.available() > 0){
    lcd.print("                ");
    Serial.readBytesUntil('\n', inputBuffer, 32);
    lcd.setCursor(0, 0);
    lcd.print(inputBuffer);
    memset(inputBuffer, 0, sizeof(inputBuffer));
  }
}

#include <Wire.h> 
#include <LiquidCrystal_I2C.h>

char inputBuffer[32 + 1];

LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup(){
  Serial.begin(9600);
  pinMode(ledPin, OUTPUT);
  lcd.init();
  lcd.backlight();
}

void loop(){
  if(Serial.available() > 0){
    lcd.print("                ");
    Serial.readBytesUntil('\n', inputBuffer, 80);
    lcd.setCursor(0, 0);
    lcd.print(inputBuffer);
    memset(inputBuffer, 0, sizeof(inputBuffer));
  }
}

#include <Wire.h> 
#include <LiquidCrystal_I2C.h>

char inputBuffer[32 + 1];

LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup(){
  Serial.begin(9600);
  pinMode(ledPin, OUTPUT);
  lcd.init();
  lcd.backlight();
}

void loop(){
  if(Serial.available() > 0){
    lcd.print("                ");
    Serial.readBytesUntil('\n', inputBuffer, 32);
    lcd.setCursor(0, 0);
    lcd.print(inputBuffer);
    memset(inputBuffer, 0, sizeof(inputBuffer));
  }
}

EDIT

Here is a second Arduino sketch that will display the mouse X/Y values sent from Processing on a LCD. You could change the Processing sketch's frameRate() value to 10.

#include <Wire.h> 
#include <LiquidCrystal_I2C.h>

char inputBuffer[32 + 1];

LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup(){
  Serial.begin(9600);
  pinMode(ledPin, OUTPUT);
  lcd.init();
  lcd.backlight();
}

void loop(){
  if(Serial.available() > 0){
    lcd.print("                ");
    Serial.readBytesUntil('\n', inputBuffer, 80);
    lcd.setCursor(0, 0);
    lcd.print(inputBuffer);
    memset(inputBuffer, 0, sizeof(inputBuffer));
  }
}