Arduino and Processing communication

Projects Interfacing w/ Software on the Computer
3

Yes, I read.
it slightly helped me. I can not always run my test

String Power = "";

if (Power == "1") //OK => Connect
{
text();
}
else // No Connect
{
text();
}

void serialEvent (Serial port)
  {
    data = port.readStringUntil('.');
    data = data.substring(0, data.length() - 1);
    
    index_Power = data.indexOf(",");     //  My arduino send "1"
    Power = data.substring(0, index_Power );
  
  }