Oracle 1Z0-809 Exam Questions 2021

NEW QUESTION 1
Given:

and the code fragment:

Which two code fragments, when inserted at line n1 independently, enable the code to print TruckCarBike?

• A. .sorted ((v1, v2) -> v1.getVId() < v2.getVId())
• B. .sorted (Comparable.comparing (Vehicle: :getVName)).reversed ()
• C. .map (v -> v.getVid()).sorted ()
• D. .sorted((v1, v2) -> Integer.compare(v1.getVId(), v2.getVid()))
• E. .sorted(Comparator.comparing ((Vehicle v) -> v.getVId()))

Answer: B

NEW QUESTION 2
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 customer IDs.
• C. The program prints Error.
• D. compilation fails on line 13.

Answer: C

NEW QUESTION 3
Which action can be used to load a database driver by using JDBC3.0?

• A. Add the driver class to the META-INF/services folder of the JAR file.
• B. Include the JDBC driver class in a jdbc.properties file.
• C. Use the java.lang.Class.forName method to load the driver class.
• D. Use the DriverManager.getDriver method to load the driver class.

Answer: C

NEW QUESTION 4
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); v.increSpeed(60);
What is the result?

• A. Velocity with new speed
• B. A compilation error occurs at line n1.
• C. A compilation error occurs at line n2.
• D. A compilation error occurs at line n3.

Answer: A

NEW QUESTION 5
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

Answer: B

NEW QUESTION 6
Given the code fragment:

What is the result?

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

Answer: D

NEW QUESTION 7
Given the code fragment:

Assume that the value of now is 6:30 in the morning. What is the result?

• A. An exception is thrown at run time.
• B. 60
• C. 1

Answer:

NEW QUESTION 8
Given the code fragment:

What is the result?

• A. DavidDavid[Susan, Allen]
• B. SusanSusan[Susan, Allen]
• C. SusanAllen [David]
• D. DavidAllen [Susan]
• E. SusanAllen[Susan, David]

Answer: C

NEW QUESTION 9
Given the code fragment:

What is the result?

• A. A compilation error occurs at line n2.
• B. 3
• C. 2
• D. A compilation error occurs at line n1.

Answer: A

NEW QUESTION 10
Given:

What is the result?

• A. Bar Hello Foo Hello
• B. Bar Hello Baz Hello
• C. Baz Hello
• D. A compilation error occurs in the Daze class.

Answer: C

NEW QUESTION 11
Which statement is true about the single abstract method of the java.util.function.Function interface?

• A. It accepts one argument and returns void.
• B. It accepts one argument and returns boolean.
• 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: D

NEW QUESTION 12
Which two statements are true about localizing an application? (Choose two.)

• A. Support for new regional languages does not require recompilation of the code.
• B. Textual elements (messages and GUI labels) are hard-coded in the code.
• C. Language and region-specific programs are created using localized data.
• D. Resource bundle files include data and currency information.
• E. Language codes use lowercase letters and region codes use uppercase letters.

Answer: AE

NEW QUESTION 13
Given the definition of the Book class:

Which statement is true about the Book class?

• A. It demonstrates encapsulation.
• B. It is defined using the factory design pattern.
• C. It is defined using the singleton design pattern.
• D. It demonstrates polymorphism.
• E. It is an immutable class.

Answer: A

NEW QUESTION 14
Given:
1. abstract class Shape {
2. Shape ( ) { System.out.println (“Shape”); }
3. protected void area ( ) { System.out.println (“Shape”); } 4. }
5.
6. class Square extends Shape {
7. int side;
8. Square int side {
9. /* insert code here */
10. this.side = side;
11. }
12. public void area ( ) { System.out.println (“Square”); }
13. }
14. class Rectangle extends Square {
15. int len, br;
16. Rectangle (int x, int y) {
17. /* insert code here */
18. len = x, br = y;
19. }
20. void area ( ) { System.out.println (“Rectangle”); }
21. }
Which two modifications enable the code to compile? (Choose two.)

• A. At line 1, remove abstract
• B. At line 9, insert super ( );
• C. At line 12, remove public
• D. At line 17, insert super (x);
• E. At line 17, insert super (); super.side = x;
• F. At line 20, use public void area ( ) {

Answer: DF

NEW QUESTION 15
Given the code fragment:

Which code fragment, when inserted at line 7, enables printing 100?

• A. Function<Integer> funRef = e –> e + 10; Integer result = funRef.apply(value);
• B. IntFunction funRef = e –> e + 10; Integer result = funRef.apply (10);
• C. ToIntFunction<Integer> funRef = e –> e + 10;int result = funRef.applyAsInt (value);
• D. ToIntFunction funRef = e –> e + 10; int result = funRef.apply (value);

Answer: A

NEW QUESTION 16
Given:
class Sum extends RecursiveAction { //line n1 static final int THRESHOLD_SIZE = 3;
int stIndex, lstIndex; int [ ] data;
public Sum (int [ ]data, int start, int end) { this.data = data;
this stIndex = start; this. lstIndex = end;
}
protected void compute ( ) { int sum = 0;
if (lstIndex – stIndex <= THRESHOLD_SIZE) { for (int i = stIndex; i < lstIndex; i++) {
sum += data [i];
}
System.out.println(sum);
} else {
new Sum (data, stIndex + THRESHOLD_SIZE, lstIndex).fork( ); new Sum (data, stIndex,
Math.min (lstIndex, stIndex + THRESHOLD_SIZE)
).compute ();
}
}
}
and the code fragment:
ForkJoinPool fjPool = new ForkJoinPool ( ); int data [ ] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}
fjPool.invoke (new Sum (data, 0, data.length));
and given that the sum of all integers from 1 to 10 is 55. Which statement is true?

• A. The program prints several values that total 55.
• B. The program prints 55.
• C. A compilation error occurs at line n1.
• D. The program prints several values whose sum exceeds 55.

Answer: A