2023 Updated Verified Pass 1z0-809 Exam - Real Questions and Answers
Dumps Moneyack Guarantee - 1z0-809 Dumps Approved Dumps
The 1z0-809 exam covers a wide range of topics, including Java Class Design, Advanced Inheritance, Generics and Collections, Lambda Expressions, Java File I/O (NIO.2), Concurrency, JDBC, Localization, and Annotations. Candidates are also expected to have experience with Java tools and technologies, including the Java Development Kit (JDK), the Java SE 8 API documentation, and the Java Platform, Enterprise Edition (Java EE). 1z0-809 exam consists of 85 multiple-choice and multiple-select questions and has a duration of 180 minutes. A passing score of 65% or higher is required to obtain certification.
NEW QUESTION # 27
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 runmethods of both the Workerand Masterclasses are executed.
Which modification meets the requirement?
- A. Replace line n1with class Master extends Thread {
- B. At line n2, insert CyclicBarrier cb = new CyclicBarrier(2, master);
- C. At line n2, insert CyclicBarrier cb = new CyclicBarrier(master);
- D. At line n2, insert CyclicBarrier cb = new CyclicBarrier(1, master);
Answer: A
NEW QUESTION # 28
Given:
class RateOfInterest {
public static void main (String[] args) {
int rateOfInterest = 0;
String accountType = "LOAN";
switch (accountType) {
case "RD";
rateOfInterest = 5;
break;
case "FD";
rateOfInterest = 10;
break;
default:
assert false: "No interest for this account"; //line n1
}
System.out.println ("Rate of interest:" + rateOfInterest);
}
}
and the command:
java -ea RateOfInterest
What is the result?
- A. A compilation error occurs at line n1.
- B. An AssertionError is thrown.
- C. No interest for this account
- D. Rate of interest: 0
Answer: C
NEW QUESTION # 29
Given the code fragments :
and
What is the result?
TV Price :110 Refrigerator Price :2100
- A.
- B. The program prints nothing.
- C.
- D. A compilation error occurs.
TV Price :1000 Refrigerator Price :2000
Answer: A
NEW QUESTION # 30
Given:
public class Canvas implements Drawable {
public void draw () { }
}
public abstract class Board extends Canvas { }
public class Paper extends Canvas {
protected void draw (int color) { }
}
public class Frame extends Canvas implements Drawable {
public void resize () { }
}
public interface Drawable {
public abstract void draw ();
}
Which statement is true?
- A. Framedoes not compile.
- B. All classes compile successfully.
- C. Boarddoes not compile.
- D. Drawabledoes not compile.
- E. Paperdoes not compile.
Answer: E
NEW QUESTION # 31
Given the code fragment:
What is the result?
- A. 4000 : 1000
- B. 4000 : 2000
- C. 1000 : 2000
- D. 1000 : 4000
Answer: B
NEW QUESTION # 32
Given:
And given the commands:
What is the result?
- A. Failure
- B. Compilation fails.
- C. An exception is thrown at runtime.
- D. Success
Answer: A
NEW QUESTION # 33
Given the code fragment:
List<Integer> values = Arrays.asList (1, 2, 3);
values.stream ()
.map(n -> n*2)//line n1
.peek(System.out::print)//line n2
.count();
What is the result?
- A. A compilation error occurs at line n1.
- B. 0
- C. A compilation error occurs at line n2.
- D. The code produces no output.
Answer: B
NEW QUESTION # 34
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. 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: D
NEW QUESTION # 35
Given the code fragment:
What is the result?
- A. Found Red Found Default
- B. Found Red Found Blue Found Teal
- C. Found Default
- D. Found Red Found Blue Found Teal Found Default
- E. Found Teal
Answer: E
NEW QUESTION # 36
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 an argument and produces a result of any data type.
- C. It accepts one argument and returns void.
- D. It accepts one argument and always produces a result of the same type as the argument.
Answer: D
Explanation:
Explanation/Reference:
Reference: http://winterbe.com/posts/2014/03/16/java-8-tutorial/ (functions)
NEW QUESTION # 37
Given the code fragment:
What is the result?
- A. No Match
- B. Match 1
- C. Match 2
- D. A nullPointerException is thrown at runtime.
Answer: C
NEW QUESTION # 38
Given:
interface Doable {
public void doSomething (String s);
}
Which two class definitions compile?
- A. public class Do implements Doable {
public void doSomething(Integer i) { }
public void doSomething(String s) { }
public void doThat (String s) { }
} - B. public class Job implements Doable {
public void doSomething(Integer i) { }
} - C. public abstract class Task implements Doable {
public void doSomethingElse(String s) { }
} - D. public abstract class Work implements Doable {
public abstract void doSomething(String s) { }
public void doYourThing(Boolean b) { }
} - E. public class Action implements Doable {
public void doSomething(Integer i) { }
public String doThis(Integer j) { }
}
Answer: B,E
NEW QUESTION # 39
Given that version.txt is accessible and contains:
1234567890
and given the code fragment:
What is the result?
- A. The program prints nothing.
- B. 0
- C. 1
- D. 2
Answer: B
NEW QUESTION # 40
Given the code fragment:
What is the result?
- A. A compilation error occurs at line n1.
- B. Logged out at: 2015-01-12T21:58:00Z
- C. Can't logout
- D. Logged out at: 2015-01-12T21:58:19.880Z
Answer: B
NEW QUESTION # 41
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. Travel time is 6 hours
- B. Travel time is 8 hours
- C. An exception is thrown at line n1.
- D. Travel time is 4 hours
Answer: D
NEW QUESTION # 42
Given the code fragments:
and
What is the result?
- A. Optional [France]
Optional [NotFound] - B. Optional[France]
Not Found - C. France
Not Found - D. France
Optional[NotFound]
Answer: C
NEW QUESTION # 43
Given:
What is the result?
- A. Compilation fails
- B. Red 0 Orange 1
- C. Red 0 Orange 0 Green 3
- D. Red 0 Orange 0 Green 6
- E. Green 4
Answer: A
NEW QUESTION # 44
Given the code fragment:
List<String> empDetails = Arrays.asList("100, Robin, HR", "200, Mary, AdminServices","101, Peter, HR"); empDetails.stream()
.filter(s-> s.contains("r"))
.sorted()
.forEach(System.out::println); //line n1
What is the result?
- A. A compilation error occurs at line n1.
- B. 100, Robin, HR200, Mary, AdminServices101, Peter, HR
- C. 100, Robin, HR101, Peter, HR
- D. 101, Peter, HR200, Mary, AdminServices
Answer: B
NEW QUESTION # 45
Given the code fragment:
public class Foo {
public static void main (String [ ] args) {
Map<Integer, String> unsortMap = new HashMap< > ( );
unsortMap.put (10, "z");
unsortMap.put (5, "b");
unsortMap.put (1, "d");
unsortMap.put (7, "e");
unsortMap.put (50, "j");
Map<Integer, String> treeMap = new TreeMap <Integer, String> (new
Comparator<Integer> ( ) {
@Override public int compare (Integer o1, Integer o2) {return o2.compareTo
(o1); } } );
treeMap.putAll (unsortMap);
for (Map.Entry<Integer, String> entry : treeMap.entrySet () ) {
System.out.print (entry.getValue () + " ");
}
}
}
What is the result?
- A. A compilation error occurs.
- B. d b e z j
- C. j z e b d
- D. z b d e j
Answer: C
NEW QUESTION # 46
Given the content of Operator.java, EngineOperator.java,and Engine.javafiles:
and the code fragment:
What is the result?
- A. ON OFF
- B. The Engine.javafile fails to compile.
- C. The Operator.javafile fails to compile.
- D. The EngineOperator.javafile fails to compile.
Answer: B
NEW QUESTION # 47
Given:
and the code fragment:
What is the result?
- A. A compilation error occurs at line n1.
- B. The program compiles successfully.
- C. A compilation error occurs at line n2.
- D. A compilation error occurs because the try block doesn't have a catch or finally block.
Answer: D
NEW QUESTION # 48
Given:
and
Which interface from the java.util.functionpackage should you use to refactor the class Txt?
- A. Function
- B. Supplier
- C. Consumer
- D. Predicate
Answer: B
NEW QUESTION # 49
Given the for loop construct:
for ( expr1 ; expr2 ; expr3 ) {
statement;
}
Which two statements are true?
- A. When expr2 evaluates to false, the loop terminates. It is evaluated only after each iteration through the loop.
- B. The expression expr3 must be present. It is evaluated after each iteration through the loop.
- C. The expression expr1 is optional. it initializes the loop and is evaluated once, as the loop begin.
- D. This is not the only valid for loop construct; there exits another form of for loop constructor.
Answer: A,C
Explanation:
The for statement have this forms:
for (init-stmt; condition; next-stmt) {
body
}
There are three clauses in the for statement.
The init-stmt statement is done before the loop is started, usually to initialize an iteration
variable.
The condition expression is tested before each time the loop is done. The loop isn't
executed if the boolean expression is false (the same as the while loop).
The next-stmt statement is done after the body is executed. It typically increments an
iteration variable.
NEW QUESTION # 50
Given:
What is the result?
- A. A StringIndexOutOfBoundsException is thrown at runtime.
- B. A NullPointerException is thrown at runtime.
- C. d
- D. AnArrayIndexOutOfBoundsException is thrown at runtime.
- E. The program prints nothing
Answer: A
NEW QUESTION # 51
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 the three files.
- C. The program prints the content of data.txt file.
- D. The program prints:
Exception
<<The content of the data.txt file>>
Exception
Answer: C
NEW QUESTION # 52
......
Updated PDF (New 2023) Actual Oracle 1z0-809 Exam Questions: https://www.testsdumps.com/1z0-809_real-exam-dumps.html
Verified 1z0-809 Exam Dumps PDF [2023] Access using TestsDumps: https://drive.google.com/open?id=1KHk2cBBZ3wnJYCoKXsozH4dxCbruj74B
