pgsamila

boolean isJavaFun = true;
System.out.println(isJavaFun);// Outputs true

pgsamila

Math.max(50, 100);

Math.min(50, 100);

Math.sqrt(100);

Math.random();

pgsamila

int num1 = 200 + 50;    // 250 (200 + 50)

int num2 = num1 + 250;  // 500 (250 + 250)

int num3 = num2 + num2; // 1000 (500 + 500)

pgsamila

int myInt = 9;
double myDouble = myInt;

pgsamila

// This is a single line comment
System.out.println("Hello World");

System.out.println("Hello World"); // This is a single comment

/* This is a multiple line comment, 
The code below will print the words Hello World to the screen, and it is amazing */
System.out.println("Hello World");

pgsamila

public class Hello {
  public static void main(String[] args) {
    System.out.println("Hello World");
  }
}

pgsamila

void loop() {

  if (!client.connected()) {
    reconnect();
  }
  client.loop();

  long now = millis();
  if (now - lastMsg > 2000) {
    lastMsg = now;

pgsamila

void setup() {
  // Initialize NodeMCU
  Serial.begin(115200);
  setup_wifi();
  client.setServer(mqtt_server, 1883);
  client.setCallback(callback);
}

pgsamila

void reconnect() {
  // Loop until we’ re reconnected
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    // Create a random client ID
    String clientId = "ESP8266Client-";
    clientId += String(random(0xffff), HEX);
    // Attempt to connect
    if (client.connect(clientId.c_str())) {
      Serial.println("connected");

pgsamila

void callback(char* topic, byte* payload, unsigned int length) {
  Serial.print("Message arrived [");
  Serial.print(topic);
  Serial.print("] ");
  for (int i = 0; i < length; i++) {
    Serial.print((char)payload[i]);
  }
  Serial.println();

  // Do something with node MCU