I want to know the basics of arduino serial comunications and connection with a java application in windows

Can anybody provide me with a sample java program that on run just makes an arduino pin high as well as the according arduino sketch

  and some explenation on how the arduino comunicates with the java app

I am now starting with arduino,

  I have some experience with java

found this code on the net will this work?

JAVA CODE

 package arduino;

import jssc.SerialPort;
import jssc.SerialPortException;

public class Arduino {

public static void main(String[] args) throws InterruptedException {

    SerialPort serialPort = new SerialPort("COM3");
    try {
        System.out.println("Port opened: " + serialPort.openPort());
        System.out.println("Params setted: " + serialPort.setParams(9600, 8, 1, 0));
        System.out.println("\"Hello World!!!\" successfully writen to port: " + serialPort.writeBytes("o".getBytes()));
        Thread.sleep(1000);
        System.out.println("\"Hello World!!!\" successfully writen to port: " + serialPort.writeBytes("f".getBytes()));
        System.out.println("Port closed: " + serialPort.closePort());
    } catch (SerialPortException ex) {
        System.out.println(ex);
    }
  }
}

ARDUINO

I want to know the basics of Arduino serial communications and connection with a Java application in Windows.

Can anybody provide me with a sample Java program that upon running just makes an Arduino pin high as well as the corresponding Arduino sketch, and some explanation on how the Arduino communicates with the Java app?

I am now starting with Arduino, and I have some experience with Java

I found this code on the net - will this work?

Java code

package arduino;

import jssc.SerialPort;
import jssc.SerialPortException;

public class Arduino {

public static void main(String[] args) throws InterruptedException {

    SerialPort serialPort = new SerialPort("COM3");
    try {
        System.out.println("Port opened: " + serialPort.openPort());
        System.out.println("Params setted: " + serialPort.setParams(9600, 8, 1, 0));
        System.out.println("\"Hello World!!!\" successfully writen to port: " + serialPort.writeBytes("o".getBytes()));
        Thread.sleep(1000);
        System.out.println("\"Hello World!!!\" successfully writen to port: " + serialPort.writeBytes("f".getBytes()));
        System.out.println("Port closed: " + serialPort.closePort());
    } catch (SerialPortException ex) {
        System.out.println(ex);
    }
  }
}

Arduino

found this code on the net will this work?

JAVA CODE

 package arduino;

import jssc.SerialPort;
import jssc.SerialPortException;

public class Arduino {

public static void main(String[] args) throws InterruptedException {

    SerialPort serialPort = new SerialPort("COM3");
    try {
        System.out.println("Port opened: " + serialPort.openPort());
        System.out.println("Params setted: " + serialPort.setParams(9600, 8, 1, 0));
        System.out.println("\"Hello World!!!\" successfully writen to port: " + serialPort.writeBytes("o".getBytes()));
        Thread.sleep(1000);
        System.out.println("\"Hello World!!!\" successfully writen to port: " + serialPort.writeBytes("f".getBytes()));
        System.out.println("Port closed: " + serialPort.closePort());
    } catch (SerialPortException ex) {
        System.out.println(ex);
    }
  }
}

ARDUINO

  void setup()   {                
  Serial.begin(9600);
  pinMode(8, OUTPUT);
  digitalWrite(8,HIGH);
  delay(500);
  digitalWrite(8,LOW);
  }

  int incomingByte = 0;

  void loop()                     
  {
 // send data only when you receive data:
    if (Serial.available() > 0) {
           int text = Serial.read();
           Serial.println(text);
           if (text == 'o') {
            
            digitalWrite(8,HIGH);
             
           }
           
           if (text = 'f') {
            
            digitalWrite(8,LOW);
             
           }
     }

  }