Free Online Oracle 1Z0-809 Practice Test

Prepare Your Oracle 1Z0-809 Exam Questions with Free online 1Z0-809 Practice Test. Get Brilliant Java SE 8 Programmer II Exam Results with Valid 1Z0 809 Exam Dumps.

Page: 1 / 94

Total 469 Questions | Updated On: Apr 23, 2024

Question 1

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

Question 2

The last statement inside main(String []) method, increments value of i, which means it is not effectively final and hence compilation error.

//Test.java

package com.udayan.ocp;

class Player {

String name;

int age;

Player() {

this.name = "Virat";

this.age = 29;

}

public int hashCode() {

return 100;

}

public class Test {

public static void main(String[] args) {

System.out.println(new Player());

}

Hexadecimal representation of 100 is 64.

Which of the following option is correct?

A : Code compiles successfully but throws an exception on executing it

B : Code compiles successfully and on execution always prints "com.udayan.ocp.Player@64" on to the console

C : Code doesn't compile successfully

D : None of the other options

Answer: B

Question 3

You want to create a singleton class by using the Singleton design pattern. Which two statements enforce the singleton nature of the design? (Choose two.)

A : Make the class static.

B : Make the constructor private.

C : Override equals() and hashCode() methods of the java.lang.Object class

D : Use a public reference to point to the single instance

E : Implement the Serializable interface

F : Make the single instance created static and final.

Answer: A,B

Question 4

Given:

public class Counter {

public static void main (String[ ] args) {

int a = 10;

int b = -1;

assert (b >=1) : “Invalid Denominator”;

int с = a / b;

System.out.println (c);

}

What is the result of running the code with the –da option?

A : -10

B : 0

C : An AssertionError is thrown.

D : A compilation error occurs.

Answer: A

Question 5

Given code of Test.java file:

1. package com.udayan.ocp;

3. import java.util.*;

5. public class Test {

6. public static void main(String[] args) {

7. NavigableMap map = new TreeMap<>();

8. map.put(25, "Pune");

9. map.put(32, "Mumbai");

10. map.put(11, "Sri Nagar");

11. map.put(39, "Chennai");

12.

13. System.out.println(map.headMap(25, true));

14. }

15. }

A : {25=Pune, 32=Mumbai, 39=Chennai}

B : {32=Mumbai, 39=Chennai}

C : {11=Sri Nagar, 25=Pune}

D : {11=Sri Nagar}

Answer: C

Page: 1 / 94

Total 469 Questions | Updated On: Apr 23, 2024