ashkrit

//Always Happy
        Optional<String> phone = contactNumber(p);
        Optional<String> email = email(p);

        System.out.println("Calling Phone " + phone.get());
        System.out.println("Sending Email " + email.get());

ashkrit

Optional<String> phone = contactNumber(p);
        Optional<String> email = email(p);

        if (phone.isPresent()) {
            System.out.println("Calling Phone " + phone.get());
        }
        if (email.isPresent()) {
            System.out.println("Sending Email " + email.get());
        }

ashkrit

//Not using optional
        if (p.email != null) {
            System.out.println("Sending email to " + p.email);
        }

        if (p.phone != null) {
            System.out.println("Calling " + p.phone);
        }

ashkrit

public class Person {
    final String firstName;
    final String lastName;
    
     final String email; // This can be null
    final String phone; //This can be null
}

ashkrit

public class VerifyCurrentGC {

    public static void main(String... args) {

        var gcBeans = ManagementFactory.getGarbageCollectorMXBeans();

        gcBeans.stream().forEach(gc -> {

            out.println(format("GC Name : %s", gc.getName()));
            var poolNames = gc.getMemoryPoolNames();

ashkrit

public class MemoryAllocator {

    public static final int KB = 1024;
    static int mbToAllocate = Integer.getInteger("mb", 1000);

    public static void main(String[] args) {
        System.out.println(String.format("Start allocation of %s MBs", mbToAllocate));

        for (var i = 0; i < mbToAllocate; i++) {
            var garbage = new byte[KB * KB];

ashkrit

listener, listenError := net.ListenTCP("tcp", addr)
  if listenError != nil {
    return nil, fmt.Errorf("Listen: %s", listenError)
  }

ashkrit

def main(args: Array[String]): Unit = {
  
    val res = divide(10, 0)
    res match {
      case Left(value) => println(s"Result is ${value}")
      case Right(e) => println(s"Calculation failed reason  ${e}")
    }

    val result = trydivide(10, 0)
    result match {

ashkrit

public void close() {
        try {
            this.writer.close();
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

ashkrit

int main () 
{ 
    FILE * fp; 
    fp = fopen ("somejunkfile.txt", "rb"); 
  
    if (fp == NULL) 
    { 
        printf("errno: %d\n", errno); 
        printf("Error opening the file: %s\n", strerror(errno)); 
      exit(EXIT_FAILURE)