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Oracle 1z1-809 exam is a challenging exam that tests the candidate's knowledge and skills related to the Java programming language. Candidates who pass 1z0-809 exam are considered to be skilled Java programmers who are capable of developing complex Java applications. To prepare for the exam, candidates can take advantage of various study resources that are available online. Passing 1z0-809 exam can help candidates to advance their careers in the field of Java development.

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NEW QUESTION # 108
Given the code fragment:
public static void main (String[] args) throws IOException {
BufferedReader brCopy = null;
try (BufferedReader br = new BufferedReader (new FileReader
( "employee.txt"))) { //
line n1
br.lines().forEach(c -> System.out.println(c));
brCopy = br; //line n2
}
brCopy.ready(); //line n3;
}
Assume that the ready method of the BufferedReader, when called on a closed BufferedReader, throws an exception, and employee.txt is accessible and contains valid text.
What is the result?

• A. A compilation error occurs at line n3.
• B. A compilation error occurs at line n2.
• C. A compilation error occurs at line n1.
• D. The code prints the content of the employee.txtfile and throws an exception at line n3.

Answer: C

NEW QUESTION # 109
Given that these files exist and are accessible:

and given the code fragment:

Which code fragment can be inserted at line n1to enable the code to print only
/company/emp?

• A. Stream<Path> stream = Files.list (Paths.get ("/company"));
• B. Stream<Path> stream = Files.find(
  Paths.get ("/company"), 1,
  (p,b) -> b.isDirectory (), FileVisitOption.FOLLOW_LINKS);
• C. Stream<Path> stream = Files.walk (Paths.get ("/company"));
• D. Stream<Path> stream = Files.list (Paths.get ("/company/emp"));

Answer: B

NEW QUESTION # 110
Given the code fragment:
Path file = Paths.get ("courses.txt");
// line n1
Assume the courses.txt is accessible.
Which code fragment can be inserted at line n1 to enable the code to print the content of the courses.txt file?

• A. Stream<String> fc = Files.readAllLines (file);fc.forEach (s - > System.out.println(s));
• B. List<String> fc = Files.list(file);fc.stream().forEach (s - > System.out.println(s));
• C. Stream<String> fc = Files.lines (file);fc.forEach (s - > System.out.println(s));
• D. List<String> fc = readAllLines(file);fc.stream().forEach (s - > System.out.println(s));

Answer: C

NEW QUESTION # 111
Given:

What is the result?

• A. 10 : 22 : 22
• B. 10 : 22 : 6
• C. 10 : 30 : 6
• D. 10 : 22 : 20

Answer: A

NEW QUESTION # 112
Given the code fragment:

Which two code fragments, when inserted at line n1 independently, result in the output PEEK:
Unix?

• A. .allMatch ();
• B. .findFirst ();
• C. .findAny ();
• D. .noneMatch ();
• E. .anyMatch ();

Answer: B

NEW QUESTION # 113
Given the code fragment:

You have been asked to define the ProductCode class. The definition of the ProductCode class must allow c1 instantiation to succeed and cause a compilation error on c2 instantiation.
Which definition of ProductCode meets the requirement?

• A.
• B.
• C.
• D.

Answer: C

NEW QUESTION # 114
Given the code fragment:
List<String> str = Arrays.asList ("my", "pen", "is", "your', "pen");
Predicate<String> test = s -> {
int i = 0;
boolean result = s.contains ("pen");
System.out.print(i++) + ":");
return result;
};
str.stream()
. filter(test)
. findFirst()
. ifPresent(System.out ::print);
What is the result?

• A. 0 : 0 : 0 : 0 : 0 : pen
• B. A compilation error occurs.
• C. 0 : 1 : pen
• D. 0 : 1 : 2 : 3 : 4 :
• E. 0 : 0 : pen

Answer: B

NEW QUESTION # 115
Which two statements are true for a two-dimensional array of primitive data type?

• A. It cannot contain elements of different types.
• B. All methods of the class object may be invoked on the two-dimensional array.
• C. The length of each dimension must be the same.
• D. At the declaration time, the number of elements of the array in each dimension must be specified.

Answer: B,D

NEW QUESTION # 116
Given:
interface Doable {
public void doSomething (String s);
}
Which two class definitions compile? (Choose two.)

• A. public abstract class Work implements Doable {
  public abstract void doSomething(String s) { }
  public void doYourThing(Boolean b) { }
  }
• B. public class Job implements Doable {
  public void doSomething(Integer i) { }
  }
• C. public class Do implements Doable {
  public void doSomething(Integer i) { }
  public void doSomething(String s) { }
  public void doThat (String s) { }
  }
• D. public abstract class Task implements Doable {
  public void doSomethingElse(String s) { }
  }
• E. public class Action implements Doable {
  public void doSomething(Integer i) { }
  public String doThis(Integer j) { }
  }

Answer: C,D

NEW QUESTION # 117
Given the code fragment:

What is the result?

• A. Logged out at: 2015-01-12T21:58:00Z
• B. A compilation error occurs at line n1.
• C. Can't logout
• D. Logged out at: 2015-01-12T21:58:19.880Z

Answer: A

NEW QUESTION # 118
Given the code fragments:
class ThreadRunner implements Runnable {
public void run () { System.out.print ("Runnable") ; }
}
class ThreadCaller implements Callable {
Public String call () throws Exception {return "Callable"; )
}
and
ExecutorService es = Executors.newCachedThreadPool ();
Runnable r1 = new ThreadRunner ();
Callable c1 = new ThreadCaller ();
// line n1
es.shutdown();
Which code fragment can be inserted at line n1 to start r1 and c1 threads?

• A. es.submit(r1);Future<String> f1 = es.submit (c1);
• B. Future<String> f1 = (Future<String>) es.submit (r1);es.execute (c1);
• C. es.execute (r1);Future<String> f1 = es.execute (c1) ;
• D. Future<String> f1 = (Future<String>) es.execute(r1);Future<String> f2 = (Future<String>)
  es.execute(c1);

Answer: A

NEW QUESTION # 119
Given the following array:

Which two code fragments, independently, print each element in this array?

• A. Option E
• B. Option F
• C. Option D
• D. Option C
• E. Option A
• F. Option B

Answer: A,E

NEW QUESTION # 120
Given the code fragments:

and

Which two modifications enable to sort the elements of the emps list? (Choose two.)

• A. Replace line n1 with
  class Person implements Comparable<Person>
• B. At line n2 insert:
  public int compareTo (Person p, Person p2) {
  return p1.name.compareTo (p2.name);
  }
• C. Replace line n1 with
  class Person extends Comparator<Person>
• D. At line n2 insert
  public int compareTo (Person p) {
  return this.name.compareTo (p.name);
  }
• E. Replace line n1 with
  class Person implements Comparator<Person>
• F. At line n2 insert
  public int compare (Person p1, Person p2) {
  return p1.name.compareTo (p2.name);
  }

Answer: A,B

NEW QUESTION # 121
Given the code fragment:

What is the result?

• A. A compilation error occurs at line n2.
• B. The code reads the password without echoing characters on the console.
• C. A compilation error occurs because the IOException isn't declared to be thrown or caught?
• D. A compilation error occurs at line n1.

Answer: D

NEW QUESTION # 122
Given the code fragment:
public void recDelete (String dirName) throws IOException {
File [ ] listOfFiles = new File (dirName) .listFiles();
if (listOfFiles ! = null && listOfFiles.length >0) {
for (File aFile : listOfFiles) {
if (aFile.isDirectory ()) {
recDelete (aFile.getAbsolutePath ());
} else {
if (aFile.getName ().endsWith (".class"))
aFile.delete ();
}
}
}
}
Assume that Projects contains subdirectories that contain .class files
and is passed as an argument to the recDelete () method when it is
invoked.
What is the result?

• A. The method executes and does not make any changes to the Projects directory.
• B. The method throws an IOException.
• C. The method deletes the .class files of the Projects directory only.
• D. The method deletes all the .class files in the Projects directory and its subdirectories.

Answer: D

NEW QUESTION # 123
Given the code fragment:
public class StringReplace {
public static void main(String[] args) {
String message = "Hi everyone!";
System.out.println("message = " + message.replace("e", "X")); }
}
What is the result?

• A. A compile time error is produced.
• B. message = Hi everyone!
• C. A runtime error is produced.
• D. message =
• E. message = Hi Xveryone!
• F. message = Hi XvXryonX!

Answer: F

NEW QUESTION # 124
Which statement is true about the single abstract method of the java.util.function.Predicate interface?

• A. It accepts one argument and returns boolean.
• B. It accepts one argument and returns void.
• C. It accepts one argument and always produces a result of the same type as the argument.
• D. It accepts an argument and produces a result of any data type.

Answer: A

Explanation:
References:

NEW QUESTION # 125
Given that course.txt is accessible and contains:
Course : : Java
and given the code fragment:
public static void main (String[ ] args) {
int i;
char c;
try (FileInputStream fis = new FileInputStream (“course.txt”);
InputStreamReader isr = new InputStreamReader(fis);) {
while (isr.ready()) { //line n1
isr.skip(2);
i = isr.read ();
c = (char) i;
System.out.print(c);
}
} catch (Exception e) {
e.printStackTrace();
}
}
What is the result?
ur :: va

• A. A compilation error occurs at line n1.
• B. The program prints nothing.
• C.
• D. ueJa

Answer: C

NEW QUESTION # 126
Given the definition of the Employee class:

and this code fragment:

What is the result?

• A. [hr:Bob, hr:Eva, sales:Ada, sales:Bob]
• B. [hr:Eva, hr:Bob, sales:Bob, sales:Ada]
• C. [sales:Ada, hr:Bob, sales:Bob, hr:Eva]
• D. [Ada:sales, Bob:sales, Bob:hr, Eva:hr]

Answer: C

NEW QUESTION # 127
Given the code fragment:
9. Connection conn = DriveManager.getConnection(dbURL, userName, passWord);
10. String query = "SELECT id FROM Employee";
11. try (Statement stmt = conn.createStatement()) {
12. ResultSet rs = stmt.executeQuery(query);
13.stmt.executeQuery("SELECT id FROM Customer");
14. while (rs.next()) {
15. //process the results
16.System.out.println("Employee ID: "+ rs.getInt("id"));
17.}
18. } catch (Exception e) {
19. System.out.println ("Error");
20. }
Assume that:
The required database driver is configured in the classpath.
The appropriate database is accessible with the dbURL, userName, and passWord exists.
The Employee and Customer tables are available and each table has id column with a few records and the SQL
queries are valid.
What is the result of compiling and executing this code fragment?

• A. The program prints employee IDs.
• B. The program prints Error.
• C. compilation fails on line 13.
• D. The program prints customer IDs.

Answer: B

NEW QUESTION # 128
Which statement is true about the DriverManager class?

• A. it is written by different vendors for their specific database.
• B. It only queries metadata of the database.
• C. It returns an instance of Connection.
• D. it executes SQL statements against the database.

Answer: C

Explanation:
Explanation
The DriverManager returns an instance of Doctrine\DBAL\Connection which is a wrapper around the underlying driver connection (which is often a PDO instance).

NEW QUESTION # 129
Given:

And given the code fragment:

Which two modifications enable the code to print the following output?
Canine 60 Long
Feline 80 Short

• A. Replace line n2 with:
  super (type, maxSpeed) ;
  this.bounds = bounda;
• B. Replace line n1 with:
  this ("Canine",60);
  this.bounds = bounds;
• C. Replace line n2 with:
  super (type,maxSpeed) ;
  this (bounds) ;
• D. Replace line n1 with:
  super ( ) ;
  this.bounds = bounds;
• E. Replace line n1 with:
  this.bounds = bounda;
  super ( ) ;

Answer: D

NEW QUESTION # 130
Given:
public class product {
int id; int price;
public Product (int id, int price) {
this.id = id;
this.price = price;
}
public String toString() { return id + ":" + price; }
}
and the code fragment:
List<Product> products = Arrays.asList(new Product(1, 10),
new Product (2, 30),
new Product (2, 30));
Product p = products.stream().reduce(new Product (4, 0), (p1, p2) -> {
p1.price+=p2.price;
return new Product (p1.id, p1.price);});
products.add(p);
products.stream().parallel()
.reduce((p1, p2) - > p1.price > p2.price ? p1 : p2)
.ifPresent(System.out: :println);
What is the result?
2 : 30

• A. 2 : 30
  3 : 20
  1 : 10
• B. 4 : 0
• C. The program prints nothing.
• D. 4 : 60
• E. 4 : 60

Answer: D

NEW QUESTION # 131
......

The Oracle 1z0-809 exam consists of 80 multiple-choice and multiple-select questions that need to be answered within 150 minutes. The questions are designed to test the candidate's knowledge of Java SE 8 features such as functional programming, concurrency, database access, I/O streams, and collections. 1z0-809 exam also includes questions on Java security, localization, and deployment.

 

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