1z1-809 Dumps PDF - 1z1-809 Real Exam Questions Answers
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Earning an Oracle 1z0-809 certification can open up several career opportunities for Java developers. It is a valuable credential that demonstrates a deep understanding of Java programming concepts and techniques, and it can help candidates stand out in a competitive job market.
NEW QUESTION # 67
Given that version.txtis accessible and contains:
1234567890
and given the code fragment:
What is the result?
121
- A. 0
- B.
- C. 1
- D. The program prints nothing.
Answer: C
NEW QUESTION # 68
Given:
What is the result?
- A. 10 Hello Hello 11
- B. 100 Hello Hello 121
- C. 10 Hello 11
- D. 100 Hello 121
- E. 10 Hello Hello 121
Answer: A
NEW QUESTION # 69
Given:
and the command:
java Product 0
What is the result?
- A. New Price: 0.0
- B. An AssertionError is thrown.
- C. A NumberFormatExceptionis thrown at run time.
- D. A compilation error occurs at line n1.
Answer: A
NEW QUESTION # 70
Given the following array:
Which two code fragments, independently, print each element in this array?
- A. Option B
- B. Option A
- C. Option D
- D. Option C
- E. Option E
- F. Option F
Answer: B,E
NEW QUESTION # 71
Given the code fragment:
List<Integer> nums = Arrays.asList (10, 20, 8):
System.out.println (
//line n1
);
Which code fragment must be inserted at line n1 to enable the code to print the maximum number in the nums
list?
- A. nums.stream().max(Integer : : max).get()
- B. nums.stream().max(Comparator.comparing(a -> a)).get()
- C. nums.stream().map(a -> a).max()
- D. nums.stream().max()
Answer: B
NEW QUESTION # 72
Given:
and the code fragment:
What is the result?
true
- A. true
false - B. true
false - C. false
true - D. false
Answer: B
NEW QUESTION # 73
Given:
public interface Moveable<Integer> {
public default void walk (Integer distance) {System.out.println
( "Walking");)
public void run(Integer distance);
}
Which statement is true?
- A. Moveablecan be used as below:
Moveable animal = (Integer n) - > System.out.println(n);
animal.run(100);
Moveable.walk(20); - B. Moveablecan be used as below:
Moveable<Integer> animal = n - > System.out.println("Running" + n);
animal.run(100);
animal.walk(20); - C. Movablecannot be used in a lambda expression.
- D. Moveablecan be used as below:
Moveable<Integer> animal = n - > n + 10;
animal.run(100);
animal.walk(20);
Answer: D
NEW QUESTION # 74
Given the code fragments:
4. void doStuff() throws ArithmeticException, NumberFormatException,
Exception {
5. if (Math.random() >-1 throw new Exception ("Try again");
6. }
and
24. try {
25. doStuff ( ):
26. } catch (ArithmeticException | NumberFormatException | Exception e)
{
27. System.out.println (e.getMessage()); }
28. catch (Exception e) {
29. System.out.println (e.getMessage()); }
30. }
Which modification enables the code to print Try again?
- A. Comment the lines 28, 29 and 30.
- B. Replace line 26 with:
} catch (Exception | ArithmeticException | NumberFormatException e) { - C. Replace line 27 with:
throw e; - D. Replace line 26 with:
} catch (ArithmeticException | NumberFormatException e) {
Answer: D
NEW QUESTION # 75
Given:
public class Emp {
String fName;
String lName;
public Emp (String fn, String ln) {
fName = fn;
lName = ln;
}
public String getfName() { return fName; }
public String getlName() { return lName; }
}
and the code fragment:
List<Emp> emp = Arrays.asList (
new Emp ("John", "Smith"),
new Emp ("Peter", "Sam"),
new Emp ("Thomas", "Wale"));
emp.stream()
/ /line n1
. collect(Collectors.toList());
Which code fragment, when inserted at line n1, sorts the employees list in descending order of fNameand then ascending order of lName?
- A. .sorted (Comparator.comparing(Emp::getfName).thenComparing(Emp::getlName))
- B. .sorted (Comparator.comparing(Emp::getfName).reserved().thenComparing (Emp::getlName))
- C. .map(Emp::getfName).sorted(Comparator.reserveOrder().map
(Emp::getlName).reserved - D. .map(Emp::getfName).sorted(Comparator.reserveOrder())
Answer: B
NEW QUESTION # 76
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. A NoSuchElementException is thrown at run time.
- B. null
- C. City Not available
- D. New York
Answer: C
NEW QUESTION # 77
Given the records from the STUDENT table:
Given the code fragment:
Assume that the URL, username, and password are valid.
What is the result?
- A. The STUDENT table is updated with the record:113 : Jannet : [email protected] the program
prints:114 : John : [email protected] - B. The STUDENT table is updated with the record:113 : Jannet : [email protected] the program
prints:113 : Jannet : [email protected] - C. A SQLException is thrown at run time.
- D. The STUDENT table is not updated and the program prints:114 : John : [email protected]
Answer: C
NEW QUESTION # 78
Given:
public class SampleClass {
public static void main(String[] args) {
AnotherSampleClass asc = new AnotherSampleClass(); SampleClass sc = new
SampleClass();
sc = asc;
System.out.println("sc: " + sc.getClass());
System.out.println("asc: " + asc.getClass());
}}
class AnotherSampleClass extends SampleClass {
}
What is the result?
- A. sc: class SampleClass asc: class AnotherSampleClass
- B. sc: class Object asc: class AnotherSampleClass
- C. sc: class AnotherSampleClass asc: class SampleClass
- D. sc: class AnotherSampleClass asc: class AnotherSampleClass
Answer: D
NEW QUESTION # 79
Given:
Your design requires that:
- fuelLevel of Engine must be greater than zero when the start() method is invoked.
- The code must terminate if fuelLevel of Engine is less than or equal to zero.
Which code fragment should be added at line n1 to express this invariant condition?
- A. assert fuelLevel > 0: "Impossible fuel" ;
- B. assert fuelLevel < 0: System.exit(0);
- C. assert (fuelLevel > 0) : System.out.println ("Impossible fuel");
- D. assert (fuelLevel) : "Terminating...";
Answer: B
NEW QUESTION # 80
Given:
and
Which interface from the java.util.function package should you use to refactor the class Txt?
- A. Supplier
- B. Consumer
- C. Function
- D. Predicate
Answer: A
NEW QUESTION # 81
Given the code fragment:
Which code fragment, when inserted at line n1, ensures falseis printed?
- A. boolean b = cs.stream() .findAny() .get() .equals("Java");
- B. boolean b = cs.stream() .anyMatch (w -> w.equals ("Java"));
- C. boolean b = cs.stream() .allMatch(w -> w.equals("Java"));
- D. boolean b = cs.stream() .findFirst() .get() .equals("Java");
Answer: B
NEW QUESTION # 82
Given:
public interface Moveable<Integer> {
public default void walk (Integer distance) {System.out.println("Walking");)
public void run(Integer distance);
}
Which statement is true?
- A. Moveable can be used as below:
Moveable<Integer> animal = n - > n + 10;
animal.run(100);
animal.walk(20); - B. Movable cannot be used in a lambda expression.
- C. Moveable can be used as below:
Moveable animal = (Integer n) - > System.out.println(n);
animal.run(100);
Moveable.walk(20); - D. Moveable can be used as below:
Moveable<Integer> animal = n - > System.out.println("Running" + n);
animal.run(100);
animal.walk(20);
Answer: A
NEW QUESTION # 83
Given:
and the code fragment:
What is the result?
- A. A compilation error occurs at line n1.
- B. 0
- C. An Exceptionis thrown at run time.
- D. 1
Answer: A
NEW QUESTION # 84
Given:
interface Doable {
public void doSomething (String s);
}
Which two class definitions compile? (Choose two.)
- A. public class Job implements Doable {public void doSomething(Integer i) { }}
- B. public class Action implements Doable {public void doSomething(Integer i) { }public String
doThis(Integer j) { }} - C. public abstract class Task implements Doable {public void doSomethingElse(String s) { }}
- D. public class Do implements Doable {public void doSomething(Integer i) { }public void
doSomething(String s) { }public void doThat (String s) { }} - E. public abstract class Work implements Doable {public abstract void doSomething(String s) { }public
void doYourThing(Boolean b) { }}
Answer: C,D
NEW QUESTION # 85
Given the code fragment:
Which two code fragments can be independently inserted at line n1 to enable the code to print the elements of the array in reverse order?
- A. Option B
- B. Option D
- C. Option A
- D. Option C
- E. Option E
Answer: E
NEW QUESTION # 86
Given:
class Bird {
public void fly () { System.out.print("Can fly"); }
}
class Penguin extends Bird {
public void fly () { System.out.print("Cannot fly"); }
}
and the code fragment:
class Birdie {
public static void main (String [ ] args) {
fly( ( ) -> new Bird ( ));
fly (Penguin : : new);
}
/* line n1 */
}
Which code fragment, when inserted at line n1, enables the Birdie class to compile?
- A. static void fly (Consumer<? extends Bird> bird) {bird.accept( ) fly ();}
- B. static void fly (Supplier<? extends Bird> bird) {LOST
- C. static void fly (Supplier<Bird> bird) {bird.get( ) fly ();}
- D. static void fly (Consumer<Bird> bird) {bird :: fly ();}
Answer: C
NEW QUESTION # 87
The following grid shows the state of a 2D array:
This grid is created with the following code:
Which line of code, when inserted in place of //line n1. adds an x into the grid so that the grid contains three consecutive X'S?
- A. qrid [2] [0] = 'X' ;
- B. qrid [0] [2] = 'X' ;
- C. qrid [1] [2] = 'X' ;
- D. qrid [1] [3] = 'X' ;
- E. qrid [3] [1] = 'X' ;
Answer: A
NEW QUESTION # 88
Given the code fragment:
Assume that:
The required database driver is configured in the classpath.
The appropriate database is accessible with the dbURL, userName, and passWordexists The Employeetable has a column ID of type integer and the SQL query matches one record.
What is the result?
- A. The code prints Error.
- B. The code prints the employee ID.
- C. Compilation fails at line 15.
- D. Compilation fails at line 14.
Answer: D
NEW QUESTION # 89
......
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