1z0-809 Training & Certification Get Latest Java SE Updated on Sep 29, 2021
Certification Training for 1z0-809 Exam Dumps Test Engine
NEW QUESTION 87
Which statement is true about java.util.stream.Stream?
- A. A parallel stream is always faster than an equivalent sequential stream.
- B. Streams are intended to modify the source data.
- C. The execution mode of streams can be changed during processing.
- D. A stream cannot be consumed more than once.
Answer: C
NEW QUESTION 88
Given:
class UserException extends Exception { }
class AgeOutOfLimitException extends UserException { }
and the code fragment:
class App {
public void doRegister(String name, int age)
throws UserException, AgeOutOfLimitException {
if (name.length () < 6) {
throw new UserException ();
} else if (age >= 60) {
throw new AgeOutOfLimitException ();
} else {
System.out.println("User is registered.");
}
}
public static void main(String[ ] args) throws UserException {
App t = new App ();
t.doRegister("Mathew", 60);
}
}
What is the result?
- A. An AgeOutOfLimitException is thrown.
- B. A compilation error occurs in the main method.
- C. User is registered.
- D. A UserException is thrown.
Answer: A
NEW QUESTION 89
Given:
What is the result?
- A. Compilation fails.
- B. false false
- C. true false
- D. true true
- E. false true
Answer: E
NEW QUESTION 90
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. The program executes, does NOT affect the system, and produces NO output.
- B. Exception 1
- C. Exception 2
- D. allemp.txt is created and the content of employee.txt is copied to it.
Answer: B
NEW QUESTION 91
Given the following classes:
And given the following main method:
Which two options fail to compile when placed at line n1 of the main method?
- A. employee .budget = 200_000;
- B. manager .stockoption = 500;
- C. director .stockoptions = 1_000;
- D. employee .salary = 50_000;
- E. director .salary = 80_000;
- F. manager .budget = 1_000_000;
Answer: A,B
NEW QUESTION 92
The protected modifier on a Field declaration within a public class means that the field
______________.
- A. Can be read but not written from outside the class
- B. Cannot be modified
- C. Can be read and written from this class and its subclasses defined in any package
- D. Can be read and written from this class and its subclasses only within the same package
Answer: C
Explanation:
http://beginnersbook.com/2013/05/java-access-modifiers/
NEW QUESTION 93
Given:
class UserException extends Exception { }
class AgeOutOfLimitException extends UserException { }
and the code fragment:
class App {
public void doRegister(String name, int age)
throws UserException, AgeOutOfLimitException {
if (name.length () < 6) {
throw new UserException ();
} else if (age >= 60) {
throw new AgeOutOfLimitException ();
} else {
System.out.println("User is registered.");
}
}
public static void main(String[ ] args) throws UserException {
App t = new App ();
t.doRegister("Mathew", 60);
}
}
What is the result?
- A. User is registered.
- B. An AgeOutOfLimitException is thrown.
- C. A compilation error occurs in the main method.
- D. A UserException is thrown.
Answer: A
NEW QUESTION 94
Given the code fragments:
and
What is the result?
- A. DogCatMouse
- B. [Dog, Cat, Mouse]
- C. A compilation error occurs.
- D. null
Answer: B
NEW QUESTION 95
Given the code fragment:
List<Double> doubles = Arrays.asList (100.12, 200.32);
DoubleFunction funD = d -> d + 100.0;
doubles.stream (). forEach (funD); // line n1
doubles.stream(). forEach(e -> System.out.println(e)); // line n2
What is the result?
- A. 100.12200.32
- B. 200.12300.32
- C. A compilation error occurs at line n2.
- D. A compilation error occurs at line n1.
Answer: C
Explanation:
NEW QUESTION 96
Given:
class Worker extends Thread {
CyclicBarrier cb;
public Worker(CyclicBarrier cb) { this.cb = cb; }
public void run () {
try {
cb.await();
System.out.println("Worker...");
} catch (Exception ex) { }
}
}
class Master implements Runnable { //line n1
public void run () {
System.out.println("Master...");
}
}
and the code fragment:
Master master = new Master();
//line n2
Worker worker = new Worker(cb);
worker.start();
You have been asked to ensure that the run methods of both the Worker and Master classes are executed.
Which modification meets the requirement?
- A. At line n2, insert CyclicBarrier cb = new CyclicBarrier(2, master);
- B. At line n2, insert CyclicBarrier cb = new CyclicBarrier(master);
- C. Replace line n1 with class Master extends Thread {
- D. At line n2, insert CyclicBarrier cb = new CyclicBarrier(1, master);
Answer: C
NEW QUESTION 97
Given:
What is the result?
- A. box
- B. bo
- C. nb
- D. An exception is thrown at runtime
- E. nbo
Answer: D
NEW QUESTION 98
Given:
What is the result?
- A. false, true
- B. false, false
- C. true, false
- D. true, true
Answer: A
NEW QUESTION 99
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. The files in the home directory are listed along with their attributes.
- C. A compilation error occurs at line n1.
- D. A compilation error occurs at line n2.
Answer: A
NEW QUESTION 100
Given:
IntStream stream = IntStream.of (1,2,3);
IntFunction<Integer> inFu= x -> y -> x*y; //line n1
IntStream newStream = stream.map(inFu.apply(10)); //line n2
newStream.forEach(System.output::print);
Which modification enables the code fragment to compile?
- A. Replace line n2with:
IntStream newStream = stream.map(inFu.applyAsInt (10)); - B. Replace line n1with:
IntFunction<IntUnaryOperator> inFu = x -> y -> x*y; - C. Replace line n1with:
BiFunction<IntUnaryOperator> inFu = x -> y -> x*y; - D. Replace line n1with:
IntFunction<UnaryOperator> inFu = x -> y -> x*y;
Answer: A
NEW QUESTION 101
Given:
and
Which interface from the java.util.functionpackage should you use to refactor the class Txt?
- A. Supplier
- B. Predicate
- C. Function
- D. Consumer
Answer: A
NEW QUESTION 102
Given the code fragment:
What is the result?
- A.
- B. Javacourse
- C. A compilation error occurs at line n1.
courseJava - D. A compilation error occurs at line n2.
Answer: C
NEW QUESTION 103
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. An exception is thrown at line n1.
- B. Travel time is 6 hours
- C. Travel time is 4 hours
- D. Travel time is 8 hours
Answer: C
NEW QUESTION 104
Given the content of the employee.txt file:
Every worker is a master.
Given that the employee.txt file is accessible and the file allemp.txt does NOT exist, and the code fragment:
What is the result?
- A. The program executes, does NOT affect the system, and produces NO output.
- B. Exception 1
- C. Exception 2
- D. allemp.txt is created and the content of employee.txt is copied to it.
Answer: B
NEW QUESTION 105
Given the code fragment:
Stream<Path> files = Files.list(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. The files in the home directory are listed along with their attributes.
- C. A compilation error occurs at line n1.
- D. A compilation error occurs at line n2.
Answer: B
NEW QUESTION 106 
What is the result?
- A. A compilation error occurs at line 7.
- B. 0
- C. A compilation error occurs at line 8.
- D. A compilation error occurs at line 15.
Answer: A
NEW QUESTION 107
Given the definition of the Employee class:
and this code fragment:
What is the result?
- A. [sales:Ada, hr:Bob, sales:Bob, hr:Eva]
- B. [hr:Eva, hr:Bob, sales:Bob, sales:Ada]
- C. [hr:Bob, hr:Eva, sales:Ada, sales:Bob]
- D. [Ada:sales, Bob:sales, Bob:hr, Eva:hr]
Answer: A
Explanation:
Explanation/Reference:
NEW QUESTION 108
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