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1z0-809 Dumps Full Questions - Exam Study Guide
1Z0-809 Exam topics
Candidates must know the exam topics before they start of preparation. Because it will really help them in hitting the core. Our Oracle 1Z0-809 exam dumps will include the following topics:
- Exceptions and Assertions
- Java Class Design
- Localization
- Advanced Java Class Design
- Building Database Applications with JDBC
- Lambda Built-in Functional Interfaces
- Java Concurrency
- Java Stream API
- Generics and Collections
- Java I/O Fundamentals
- Java File I/O (NIO.2)
Preparation Resources
Now that you have made your decision and know the date of the final test, you can make a plan for your thorough training. Keep in mind that the field of Java is constantly evolving, so choose only relevant and credible sources for preparation. We can find many options on the Internet: training courses, sets of questions, and study guides such as.
- ‘Oracle Certified Professional Java SE 8 Programmer Exam 1Z0-809: A Comprehensive OCPJP 8 Certification Guide 2nd Edition’ by SG Ganesh, Hari Kiran Kumar, Tushar Sharma. A group of expert authors has developed a training guide consisting of 14 chapters to prepare candidates for all 1Z0-809 exam topics and develop all the skills necessary for a professional Java SE 8 developer. The book begins with answers to the most frequently asked questions about the OCP Java SE 8 Programmer certification process, and at the end of the training you will be offered a practice exam for your self-check. What's more, for a more comprehensive approach, you'll get real-life examples, practice questions, exam notes and tips. Anyone can order this book in the Kindle version or print format on Amazon, and then get the key to passing the Oracle 1Z0-809 exam brilliantly.
- ‘OCP: Oracle Certified Professional Java SE 8 Programmer II Study Guide: Exam 1Z0-809 1st Edition, Kindle Edition by Jeanne Boyarsky and Scott Selikoff. The study guide, developed by expert Java developers, aims to strengthen candidates' existing knowledge as well as to develop new skills needed to obtain the OCP Java SE 8 Programmer certification. As a result, you will gain a solid understanding of abstract classes, interfaces, and class design, learn object-oriented design principles and patterns, and deepen into functional programming. And thanks to the practical work with expert-led database practice you will master input-output, NIO, and JDBC, which will help you not only to pass the Oracle 1Z0-809 exam perfectly but also to sharpen the skills necessary for a Java developer in solving everyday tasks. So when you order this guide from Amazon in Kindle or Paperback version, you get not only the prep material but also the insight, explanations, and perspectives that come from years of experience
- ‘OCP Java SE 8 Programmer II Exam Guide (Exam 1Z0-809) 7th Edition’ by Kathy Sierra, Bert Bates, and Elisabeth Robson. Developed by a team of experts, including two Java SE 8 Programmer II exam developers, the study guide fully follows the objectives of the official test and assists candidates greatly in through preparation for this Oracle exam. The book's content is designed to provide comprehensive coverage of each topic such as object orientation, streams, threads, and concurrency, as well as providing you with the fundamentals of programming in the Java language. So, both the Kindle and the print version are available on Amazon making it easy for any candidate to obtain the OCP Java SE 8 Programmer certification.
In other words, there are a huge number of training resources available to you to help you write your final test with flying colors, become an Oracle Certified Professional Java SE 8 Programmer, and take the next step in your IT career.
NEW QUESTION 67
Given the following class:
Which two changes would encapsulate this class and ensure that the area field is always equal to length * height whenever the Rectangle class is used?
- A. Call the setArea method at the end of the setHeight method.
- B. Call the setArea method at the beginning of the setHeight method.
- C. Change the setArea method to private.
- D. Call the setArea method at the end of the setLength method.
- E. Change the area field to public.
- F. Call the setArea method at the beginning of the setLength method.
Answer: C,E
NEW QUESTION 68
Given:
and the code fragment:
What is the result?
- A. A compilation error occurs.
- B. [Java ME: Jessy:Chicago, Java ME: Mark:Chicago]
[Java EE: Helen:Houston] - C. Java EE
Java ME - D. [Java EE: Helen:Houston]
[Java ME: Jessy:Chicago, Java ME: Mark:Chicago]
Answer: A
Explanation:
Explanation/Reference:
Explanation:
NEW QUESTION 69
The data.doc, data.txt and data.xml files are accessible and contain text.
Given the code fragment:
Stream<Path> paths = Stream.of (Paths. get("data.doc"),
Paths. get("data.txt"),
Paths. get("data.xml"));
paths.filter(s-> s.toString().endWith("txt")).forEach(
s -> {
try {
Files.readAllLines(s)
.stream()
.forEach(System.out::println); //line n1
} catch (IOException e) {
System.out.println("Exception"); }
}
);
What is the result?
- A. A compilation error occurs at line n1.
- B. The program prints the content of data.txt file.
- C. The program prints:
Exception
<<The content of the data.txt file>>
Exception - D. The program prints the content of the three files.
Answer: B
NEW QUESTION 70
Given:
What is the result?
- A. 3 5
- B. 9 25
- C. 0 0
- D. Compilation fails.
Answer: A
NEW QUESTION 71
Given the code fragment:
public class FileThread implements Runnable {
String fName;
public FileThread(String fName) { this.fName = fName; }
public void run () System.out.println(fName);}
public static void main (String[] args) throws IOException,
InterruptedException {
ExecutorService executor = Executors.newCachedThreadPool();
Stream<Path> listOfFiles = Files.walk(Paths.get("Java Projects"));
listOfFiles.forEach(line -> {
executor.execute(new FileThread(line.getFileName().toString
())); //
line n1
});
executor.shutdown();
executor.awaitTermination(5, TimeUnit.DAYS); //
line n2
}
}
The Java Projects directory exists and contains a list of files.
What is the result?
- A. The program throws a runtime exception at line n2.
- B. A compilation error occurs at line n1.
- C. The program prints files names concurrently.
- D. The program prints files names sequentially.
Answer: C
NEW QUESTION 72
Given the content of the employee.txtfile:
Every worker is a master.
Given that the employee.txtfile is accessible and the file allemp.txtdoes NOT exist, and the code fragment:
What is the result?
- A. Exception 2
- B. The program executes, does NOT affect the system, and produces NO output.
- C. Exception 1
- D. allemp.txt is created and the content of employee.txt is copied to it.
Answer: C
NEW QUESTION 73
Given the code fragment:
List<String> listVal = Arrays.asList("Joe", "Paul", "Alice", "Tom");
System.out.println (
// line n1
);
Which code fragment, when inserted at line n1, enables the code to print the count of string elements whose length is greater than three?
- A. listVal.stream().filter(x -> x.length()>3).mapToInt(x -> x).count()
- B. listVal.stream().peek(x -> x.length()>3).count().get()
- C. listVal.stream().map(x -> x.length()>3).count()
- D. listVal.stream().filter(x -> x.length()>3).count()
Answer: B
NEW QUESTION 74
Given the code fragment:
List<Integer> list1 = Arrays.asList(10, 20);
List<Integer> list2 = Arrays.asList(15, 30);
//line n1
Which code fragment, when inserted at line n1, prints 10 20 15 30?
- A. Stream.of(list1, list2)
. flatMap(list -> list.intStream())
. forEach(s -> System.out.print(s + " ")); - B. list1.stream()
. flatMap(list2.stream().flatMap(e1 -> e1.stream())
. forEach(s -> System.out.println(s + " ")); - C. Stream.of(list1, list2)
. flatMapToInt(list -> list.stream())
. forEach(s -> System.out.print(s + " ")); - D. Stream.of(list1, list2)
. flatMap(list -> list.stream())
. forEach(s -> System.out.print(s + " "));
Answer: D
NEW QUESTION 75
Given the code fragment:
Which code fragment, when inserted at line 7, enables printing 100?
- A. IntFunction funRef = e -> e + 10;
Integer result = funRef.apply (10); - B. ToIntFunction funRef = e -> e + 10;
int result = funRef.apply (value); - C. Function<Integer> funRef = e -> e + 10;
Integer result = funRef.apply(value); - D. ToIntFunction<Integer> funRef = e -> e + 10;
int result = funRef.applyAsInt (value);
Answer: C
NEW QUESTION 76
Given:
What is the result?
- A. Initialized
Started - B. An exception is thrown at runtime
- C. Initialized
Started
Initialized - D. Compilation fails
Answer: D
NEW QUESTION 77
Given the code snippet from a compiled Java source file:
Which command-line arguments should you pass to the program to obtain the following output?
Arg is 2
- A. java MyFile 1 2 2 3 4
- B. java MyFile 1 3 2 2
- C. java MyFile 0 1 2 3
- D. java MyFile 2 1 2
Answer: B
NEW QUESTION 78
Given:
final class Folder { //line n1
//line n2
public void open () {
System.out.print("Open");
}
}
public class Test {
public static void main (String [] args) throws Exception {
try (Folder f = new Folder()) {
f.open();
}
}
}
Which two modifications enable the code to print Open Close? (Choose two.)
- A. At line n2, insert:
final void close () {
System.out.print("Close");
} - B. At line n2, insert:
public void close () throws IOException {
System.out.print("Close");
} - C. Replace line n1 with:
class Folder implements AutoCloseable { - D. Replace line n1 with:
class Folder extends Closeable { - E. Replace line n1 with:
class Folder extends Exception {
Answer: B,C
NEW QUESTION 79
Assume customers.txtis accessible and contains multiple lines.
Which code fragment prints the contents of the customers.txtfile?
Stream<String> stream = Files.find (Paths.get (“customers.txt”));
- A. stream.forEach( c) -> System.out.println(c));
Stream<Path> stream = Files.list (Paths.get (“customers.txt”)); - B. stream.forEach( c) -> System.out.println(c));
Stream<String> lines = Files.lines (Paths.get (“customers.txt”)); - C. stream.forEach((String c) -> System.out.println(c));
Stream<Path> stream = Files.find (Paths.get (“customers.txt”)); - D. lines.forEach( c) -> System.out.println(c));
Answer: C
NEW QUESTION 80
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.map(a-> a.techName).forEach(System.out::print);
- B. stre.map(a-> a).forEachOrdered(System.out::print);
- C. stre.forEach(System.out::print);
- D. stre.forEachOrdered(System.out::print);
Answer: B
NEW QUESTION 81
Given the code fragment:
What is the result?
- A. 4000 : 1000
- B. 1000 : 2000
- C. 1000 : 4000
- D. 4000 : 2000
Answer: A
NEW QUESTION 82
Given the code fragment:
BiFunction<Integer, Double, Integer> val = (t1, t2) -> t1 + t2;//line n1
System.out.println(val.apply(10, 10.5));
What is the result?
- A. A compilation error occurs at line n1.
- B. 0
- C. A compilation error occurs at line n2.
- D. 20.5
Answer: A
NEW QUESTION 83
Given:
and the code fragment:
Which definition of the ColorSorter class sorts the blocks list?
- A. Option A
- B. Option C
- C. Option B
- D. Option D
Answer: C
NEW QUESTION 84
Given:
and the command:
java Product 0
What is the result?
- A. A compilation error occurs at line n1.
- B. New Price: 0.0
- C. An AssertionError is thrown.
- D. A NumberFormatException is thrown at run time.
Answer: B
NEW QUESTION 85
Given the code fragments:
class Employee {
Optional<Address> address;
Employee (Optional<Address> address) {
this.address = address;
}
public Optional<Address> getAddress() { return address; }
}
class Address {
String city = "New York";
public String getCity { return city: }
public String toString() {
return city;
}
}
and
Address address = null;
Optional<Address> addrs1 = Optional.ofNullable (address);
Employee e1 = new Employee (addrs1);
String eAddress = (addrs1.isPresent()) ? addrs1.get().getCity() : "City Not available"; What is the result?
- A. null
- B. City Not available
- C. A NoSuchElementException is thrown at run time.
- D. New York
Answer: B
Explanation:
Explanation/Reference:
NEW QUESTION 86
For which three objects must a vendor provide implementations in its JDBC driver?
- A. SQLException
- B. Statement
- C. Date
- D. Time
- E. DriverManager
- F. Connection
- G. ResultSet
Answer: B,F,G
Explanation:
Explanation
Database vendors support JDBC through the JDBC driver interface or through the ODBC connection. Each driver must provide implementations of java.sql.Connection, java.sql.Statement, java.sql.PreparedStatement, java.sql.CallableStatement, and java.sql.Re sultSet. They must also implement the java.sql.Driver interface for use by the generic java.sql.DriverManager interface.
NEW QUESTION 87
Given the code fragment:
ZonedDateTime depart = ZonedDateTime.of(2015, 1, 15, 1, 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: C
NEW QUESTION 88
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/server/exe/readme
- B. /app/log/sys/server/exe/readme
- C. /app/sys/log/readme/server/exe
- D. /app/./sys/log/readme
Answer: D
NEW QUESTION 89
Which statement is true about the single abstract method of the java.util.function.Function interface?
- A. It accepts one argument and returns boolean.
- B. It accepts one argument and always produces a result of the same type as the argument.
- C. It accepts one argument and returns void.
- D. It accepts an argument and produces a result of any data type.
Answer: B
NEW QUESTION 90
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<Vehicle> vehicles = new TreeSet <> ();
vehicles.add(new Vehicle (10123, "Ford"));
vehicles.add(new Vehicle (10124, "BMW"));
System.out.println(vehicles);
What is the result?
- A. A compilation error occurs.
- B. A ClassCastExceptionis thrown at run time.
- C. 10124 BMW
1 0123 Ford - D. 10123 Ford
10124 BMW
Answer: B
NEW QUESTION 91
......
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