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1.
import processing.net.*;

Client client;

void setup(){

size(100,100);///serverIP:120.125.70.53

client = new Client(this, "120.125.70.53", 6666);

}

void draw(){

}

void mousePressed(){

client.write("Hello");

}

2.
void setup() {
pinMode(8,OUTPUT);

}

void loop() {
  int x=analogRead(A0);
  tone(8,x);
}

3.

import processing.serial.*;

Serial serial;

void setup(){

  size(1024,1024);

  serial = new Serial(this, "COM4", 9600);

}

int x=512 , y=512;

void draw(){

  background(255);

  if( serial.available()>0){

    String now=serial.readString();

    String[] xy=splitTokens(now);

    x= int(xy[0]);

    y= int(xy[1]);

  }

  fill(255,0,0);

  ellipse(x,y,100,100);

}