Oracle 1Z0-809 Dumps Questions 2021

NEW QUESTION 1
Given the code fragment:
ZonedDateTime depart = ZonedDateTime.of(2015, 1, 15, 3, 0, 0, 0, ZoneID.of(“UTC-
7”));
ZonedDateTime arrive = ZonedDateTime.of(2015, 1, 15, 9, 0, 0, 0, ZoneID.of(“UTC-
5”));
long hrs = ChronoUnit.HOURS.between(depart, arrive); //line n1 System.out.println(“Travel time is” + hrs + “hours”);
What is the result?

• A. Travel time is 4 hours
• B. Travel time is 6 hours
• C. Travel time is 8 hours
• D. An exception is thrown at line n1.

Answer: A

NEW QUESTION 2
Which two methods from the java.util.stream.Stream interface perform a reduction operation? (Choose two.)

• A. count ()
• B. collect ()
• C. distinct ()
• D. peek ()
• E. filter ()

Answer: AB

NEW QUESTION 3
Given:
class FuelNotAvailException extends Exception { } class Vehicle {
void ride() throws FuelNotAvailException { //line n1 System.out.println(“Happy Journey!”);
}
}
class SolarVehicle extends Vehicle {
public void ride () throws Exception { //line n2 super ride ();
}
}
and the code fragment:
public static void main (String[] args) throws FuelNotAvailException, Exception
{
Vehicle v = new SolarVehicle (); v.ride();
}
Which modification enables the code fragment to print Happy Journey!?

• A. Replace line n1 with public void ride() throws FuelNotAvailException {
• B. Replace line n1 with protected void ride() throws Exception {
• C. Replace line n2 with void ride() throws Exception {
• D. Replace line n2 with private void ride() throws FuelNotAvailException {

Answer: B

NEW QUESTION 4
Given the code fragment:
Path path1 = Paths.get(“/app/./sys/”); Path res1 = path1.resolve(“log”);
Path path2 = Paths.get(“/server/exe/”); Path res1 = path1.resolve(“/readme/”); System.out.println(res1); System.out.println(res2);
What is the result?

• A. /app/sys/log/readme/server/exe
• B. /app/log/sys/server/exe/readme
• C. /app/./sys/log/readme
• D. /app/./sys/log/server/exe/readme

Answer: C

NEW QUESTION 5
Given:
class Student {
String course, name, city;
public Student (String name, String course, String city) { this.course = course; this.name = name; this.city = city;
}
public String toString() {
return course + “:” + name + “:” + city;
}
and the code fragment: List<Student> stds = Arrays.asList(
new Student (“Jessy”, “Java ME”, “Chicago”), new Student (“Helen”, “Java EE”, “Houston”), new Student (“Mark”, “Java ME”, “Chicago”)); stds.stream()
.collect(Collectors.groupingBy(Student::getCourse))
.f orEach(src, res) -> System.out.println(scr)); What is the result?

• A. [Java EE: Helen:Houston][Java ME: Jessy:Chicago, Java ME: Mark:Chicago]
• B. Java EEJava ME
• C. [Java ME: Jessy:Chicago, Java ME: Mark:Chicago] [Java EE: Helen:Houston]
• D. A compilation error occurs.

Answer: B

NEW QUESTION 6
Given the code fragment:
Stream<Path> files = Files.walk(Paths.get(System.getProperty(“user.home”))); files.forEach (fName -> { //line n1
try {
Path aPath = fName.toAbsolutePath(); //line n2 System.out.println(fName + “:”
+ Files.readAttributes(aPath, Basic.File.Attributes.class).creationTime ());
} catch (IOException ex) { ex.printStackTrace();
});
What is the result?

• A. All files and directories under the home directory are listed along with their attributes.
• B. A compilation error occurs at line n1.
• C. The files in the home directory are listed along with their attributes.
• D. A compilation error occurs at line n2.

Answer: A

NEW QUESTION 7
Given the code fragments:
class MyThread implements Runnable {
private static AtomicInteger count = new AtomicInteger (0); public void run () {
int x = count.incrementAndGet(); System.out.print (x+” “);
}
}
and
Thread thread1 = new Thread(new MyThread()); Thread thread2 = new Thread(new MyThread()); Thread thread3 = new Thread(new MyThread()); Thread [] ta = {thread1, thread2, thread3};
for (int x= 0; x < 3; x++) { ta[x].start();
}
Which statement is true?

• A. The program prints 1 2 3 and the order is unpredictable.
• B. The program prints 1 2 3.
• C. The program prints 1 1 1.
• D. A compilation error occurs.

Answer: A

NEW QUESTION 8
Given the code fragment:

Which should be inserted into line n1 to print Average = 2.5?

• A. IntStream str = Stream.of (1, 2, 3, 4);
• B. IntStream str = IntStream.of (1, 2, 3, 4);
• C. DoubleStream str = Stream.of (1.0, 2.0, 3.0, 4.0);
• D. Stream str = Stream.of (1, 2, 3, 4);

Answer: C

NEW QUESTION 9
Given the code fragments: class TechName {
String techName;
TechName (String techName) { this.techName=techName;
}
}
and
List<TechName> tech = Arrays.asList ( new TechName(“Java-“),
new TechName(“Oracle DB-“), new TechName(“J2EE-“)
);
Stream<TechName> stre = tech.stream();
//line n1
Which should be inserted at line n1 to print Java-Oracle DB-J2EE-?

• A. stre.forEach(System.out::print);
• B. stre.map(a-> a.techName).forEach(System.out::print);
• C. stre.map(a-> a).forEachOrdered(System.out::print);
• D. stre.forEachOrdered(System.out::print);

Answer: B

NEW QUESTION 10
Given:
public class Test<T> { private T t;
public T get () { return t;
}
public void set (T t) { this.t = t;
}
public static void main (String args [ ] ) { Test<String> type = new Test<>();
Test type 1 = new Test (); //line n1 type.set(“Java”);
type1.set(100); //line n2 System.out.print(type.get() + “ “ + type1.get());
}
}
What is the result?

• A. Java 100
• B. java.lang.string@<hashcode>java.lang.Integer@<hashcode>
• C. A compilation error occur
• D. To rectify it, replace line n1 with: Test<Integer> type1 = new Test<>();
• E. A compilation error occur
• F. To rectify it, replace line n2 with: type1.set (Integer(100));

Answer: A

NEW QUESTION 11
Given the code fragment:
class CallerThread implements Callable<String> { String str;
public CallerThread(String s) {this.str=s;} public String call() throws Exception { return str.concat(“Call”);
}
}
and
public static void main (String[] args) throws InterruptedException, ExecutionException
{
ExecutorService es = Executors.newFixedThreadPool(4); //line n1 Future f1 = es.submit (newCallerThread(“Call”));
String str = f1.get().toString(); System.out.println(str);
}
Which statement is true?

• A. The program prints Call Call and terminates.
• B. The program prints Call Call and does not terminate.
• C. A compilation error occurs at line n1.
• D. An ExecutionException is thrown at run time.

Answer: B

NEW QUESTION 12
Given:
public class Customer { private String fName; private String lName; private static int count;
public customer (String first, String last) {fName = first, lName = last;
++count;}
static { count = 0; }
public static int getCount() {return count; }
}
public class App {
public static void main (String [] args) { Customer c1 = new Customer(“Larry”, “Smith”);
Customer c2 = new Customer(“Pedro”, “Gonzales”); Customer c3 = new Customer(“Penny”, “Jones”); Customer c4 = new Customer(“Lars”, “Svenson”); c4 = null;
c3 = c2;
System.out.println (Customer.getCount());
}
}
What is the result?

• A. 2
• B. 3
• C. 4
• D. 5

Answer: D

NEW QUESTION 13
Which two code blocks correctly initialize a Locale variable? (Choose two.)

• A. Locale loc1 = "UK";
• B. Locale loc2 = Locale.getInstance("ru");
• C. Locale loc3 = Locale.getLocaleFactory("RU");
• D. Locale loc4 = Locale.UK;
• E. Locale loc5 = new Locale ("ru", "RU");

Answer: DE

NEW QUESTION 14

and the code fragment?

What is the result?

• A. $15.00
• B. 15 $
• C. USD 15.00
• D. USD $15

Answer: A

NEW QUESTION 15
Given:
interface Rideable {Car getCar (String name); } class Car {
private String name; public Car (String name) { this.name = name;
}
}
Which code fragment creates an instance of Car?

• A. Car auto = Car (“MyCar”): : new;
• B. Car auto = Car : : new;Car vehicle = auto : : getCar(“MyCar”);
• C. Rideable rider = Car : : new;Car vehicle = rider.getCar(“MyCar”);
• D. Car vehicle = Rideable : : new : : getCar(“MyCar”);

Answer: C

NEW QUESTION 16
Which two are elements of a singleton class? (Choose two.)

• A. a transient reference to point to the single instance
• B. a public method to instantiate the single instance
• C. a public static method to return a copy of the singleton reference
• D. a private constructor to the class
• E. a public reference to point to the single instance

Answer: BD