Oracle 1Z0-809 Online Practice Questions and Exam Preparation

Oracle 1Z0-809 Online Questions & Answers

• Question 111:

  Given:

  

  and the code fragment:

  

  What is the result?

  A. 0.0
  B. 1500.0
  C. A compilation error occurs.
  D. 2000.0
  B. 1500.0

• Question 112:

  Given the definition of the Vehicle class:

  class Vehicle {

  String name;

  void setName (String name) {

  this.name = name;

  }

  String getName() {

  return name;

  }

  }

  Which action encapsulates the Vehicle class?

  A. Make the Vehicle class public.
  B. Make the name variable public.
  C. Make the setName method public.
  D. Make the name variable private.
  E. Make the setName method private.
  F. Make the getName method private.
  D. Make the name variable private.

• Question 113:

  Given:

  

  What change should you make to guarantee a single order of execution (printed values 1 -100 in order)?

  A. Line 3: public synchronized void run() {
  B. Line 1: class MyClass extends Thread {
  C. Line 2: public volatile int value;
  D. Line 2: public synchronized int value;
  B. Line 1: class MyClass extends Thread {

• Question 114:

  Given:

  class Vehicle {

  int vno;

  String name;

  public Vehicle (int vno, String name) {

  this.vno = vno,;

  this.name = name;

  }

  public String toString () {

  return vno + ":" + name;

  }

  }

  and this code fragment:

  Set vehicles = new TreeSet <> ();

  vehicles.add(new Vehicle (10123, "Ford"));

  vehicles.add(new Vehicle (10124, "BMW"));

  System.out.println(vehicles);

  What is the result?

  A. 10123 Ford 10124 BMW
  B. 10124 BMW 10123 Ford
  C. A compilation error occurs.
  D. A ClassCastException is thrown at run time.
  D. A ClassCastException is thrown at run time.

• Question 115:

  Given the definition of the Vehicle class:

  Class Vehhicle {

  int distance; //line n1

  Vehicle (int x) {

  this distance = x;

  }

  public void increSpeed(int time) { //line n2

  int timeTravel = time; //line n3

  class Car {

  int value = 0;

  public void speed () {

  value = distance /timeTravel;

  System.out.println ("Velocity with new speed"+value+"kmph");

  }

  }

  new Car().speed();

  }

  }

  and this code fragment:

  Vehicle v = new Vehicle (100);

  A. increSpeed(60); What is the result?
  B. Velocity with new speed
  C. A compilation error occurs at line n1.
  D. A compilation error occurs at line n2.
  E. A compilation error occurs at line n3.
  A. increSpeed(60); What is the result?

• Question 116:

  Given the code fragment:

  

  What is the result?

  A. text1text2
  B. text1text2text2text3
  C. text1
  D. [text1, text2]
  A. text1text2

• Question 117:

  Given:

  public class Test {

  private T t;

  public T get () {

  return t;

  }

  public void set (T t) {

  this.t = t;

  }

  public static void main (String args [ ] ) {

  Test 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. [email protected]@
  C. A compilation error occurs. To rectify it, replace line n1 with: Test type1 = new Test();
  D. A compilation error occurs. To rectify it, replace line n2 with: type1.set (Integer(100));
  A. Java 100

• Question 118:

  Given the code fragment:

  UnaryOperator uo1 = s -> s*2; //line n1

  List loanValues = Arrays.asList(1000.0, 2000.0);

  loanValues.stream()

  .filter(lv -> lv >= 1500)

  .map(lv -> uo1.apply(lv)) //line n2

  .forEach(s -> System.out.print(s + " "));

  What is the result?

  A. 4000.0
  B. 4000
  C. A compilation error occurs at line n1.
  D. A compilation error occurs at line n2.
  D. A compilation error occurs at line n2.

• Question 119:

  Given:

  

  and the code fragment:

  

  Which definition of the ColorSorter class sorts the blocks list?

  

  A. Option A
  B. Option B
  C. Option C
  D. Option D
  C. Option C

• Question 120:

  Given the definition of the Emp class:

  public class Emp

  private String eName;

  private Integer eAge;

  Emp(String eN, Integer eA) {

  this.eName = eN;

  this.eAge = eA;

  }

  public Integer getEAge () {return eAge;}

  public String getEName () {return eName;}

  }

  and code fragment:

  Listli = Arrays.asList(new Emp("Sam", 20), New Emp("John", 60), New Emp("Jim", 51)); Predicate agVal = s -> s.getEAge() <= 60; //line n1

  li = li.stream().filter(agVal).collect(Collectors.toList());

  Stream names = li.stream()map.(Emp::getEName); //line n2

  names.forEach(n -> System.out.print(n + " "));

  What is the result?

  A. Sam John Jim
  B. John Jim
  C. A compilation error occurs at line n1.
  D. A compilation error occurs at line n2.
  C. A compilation error occurs at line n1.