Servo 90 degrees sliding 2

// Include the Servo library
#include <Servo.h>
// Declare the Servo pin
int servoPin = 3;
// Create a servo object
Servo Servo1;
void setup() {
// We need to attach the servo to the used pin number
   Servo1.attach(servoPin);
   Serial.begin(9600);
}
void loop(){
for(int i = 45; i <= 135; i=i+2)
   {Servo1.write(i);
     Serial.println(i);
     delay(100);
   }
for(int i = 135; i >= 45; i=i-2)
   {Servo1.write(i);
     Serial.println(i);
     delay(100);
   }
}