11 May, 2021

A Review Of Top Quality 1Z0-819 Practice Question

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Oracle 1Z0-819 Free Dumps Questions Online, Read and Test Now.

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Total 175 questions Full Exam Access

Question 1

Which code fragment prints 100 random numbers?
1Z0-819 dumps exhibit

Option A

Option B

Option C

Option D

Question 2

Given:

Which two are correct? (Choose two.)
1Z0-819 dumps exhibit

Option A

Option B

Option C

Option D

Question 3

Given:

Which two methods modify field values? (Choose two.)

setAllCounts

setACount

setGCount

setCCount

setTCount

Question 4

Given:

Assuming that this code compiles correctly, which three statements are true? (Choose three.)

B cannot be abstract.

B is a subtype of A.

A cannot be abstract.

A cannot be final.

B cannot be final.

A is a subtype of B.

Question 5

Given:

What is the result?

[0,0] = Red[0,1] = White[1,0] = Black[1,1] = Blue[2,0] = Yellow[2,1] = Green[3,0] = Violet

[0,0] = Red[1,0] = Black[2,0] = Blue

java.lang.ArrayIndexOutOfBoundsException thrown

[0,0] = Red[0,1] = White[1,0] = Black[2,0] = Blue[2,1] = Yellow[2,2] = Green[2,3] = Violet

Question 6

Given:

Why does D cause a compilation error?

D inherits a() only from C.

D inherits a() from B and C but the return types are incompatible.

D extends more than one interface.

D does not define any method.

Question 7

Given:

What is required to make the Foo class thread safe?

No change is required.

Make the declaration of lock static.

Replace the lock constructor call with new ReentrantLock (true).

Move the declaration of lock inside the foo method.

Question 8

Given:

Which two are secure serialization of these objects? (Choose two.)

Define the serialPersistentFields array field.

Declare fields transient.

Implement only readResolve to replace the instance with a serial proxy and not writeReplace.

Make the class abstract.

Implement only writeReplace to replace the instance with a serial proxy and not readResolve.

Question 9

Given:

and:

Which code, when inserted on line 10, prints the number of unique localities from the roster list?

.map(Employee::getLocality).distinct().count();

map(e > e.getLocality()).count();

.map(e > e.getLocality()).collect(Collectors.toSet()).count();

.filter(Employee::getLocality).distinct().count();

Question 10

Given:

What is the result?

WorkingUnknown

Unknown

TuesdayUnknown

The compilation fails.

Tuesday

Working

Question 11

var numbers = List.of(0,1,2,3,4,5,6,7,8,9);
You want to calculate the average of numbers. Which two codes will accomplish this? (Choose two.)

double avg = numbers.stream().parallel().averagingDouble(a > a);

double avg = numbers.parallelStream().mapToInt (m > m).average().getAsDouble ();

double avg = numbers.stream().mapToInt (i > i).average().parallel();

double avg = numbers.stream().average().getAsDouble();

double avg = numbers.stream().collect(Collectors.averagingDouble(n > n));

Question 12

Examine this excerpt from the declaration of the java.se module:
1Z0-819 dumps exhibit

What does the transitive modifier mean?

Only a module that requires the java.se module is permitted to require the java.sql module.

Any module that requires the java.se module does not need to require the java.sql module.

Any module that attempts to require the java.se module actually requires the java.sql module instead.

Any module that requires the java.sql module does not need to require the java.se module.

Question 13

Given:

What is the result?

It throws a runtime exception.

Value of Euler = 2.71828

The code does not compile.

Value of Euler = “2.71828”

Question 14

Given:

What is the type of the local variable x?

Character

char

String[ ]

String

Question 15

Given the code fragment:
1Z0-819 dumps exhibit

What is the output?

The compilation fail

[-1, -2, -3]

[-3, -2, -1]

A runtime exception is thrown.

Question 16

Given: Automobile.java
1Z0-819 dumps exhibit

Car.java

What must you do so that the code prints 4?

Remove the parameter from wheels method in line 3.

Add @Override annotation in line 2.

Replace the code in line 2 with Car ob = new Car();

Remove abstract keyword in line 1.

Question 17

Given:
var data = new ArrayList<>(); data.add(“Peter”);
data.add(30); data.add(“Market Road”); data.set(1, 25); data.remove(2); data.set(3, 1000L); System.out.print(data); What is the output?

[Market Road, 1000]

[Peter, 30, Market Road]

[Peter, 25, null, 1000]

An exception is thrown at run time.

Question 18

Given:

What is the result?

The compilation fails due to an error in line 1.

Question 19

Given:

Which two lines of code when inserted in line 1 correctly modifies instance variables? (Choose two.)

setCCount(c) = cCount;

tCount = tCount;

setGCount(g);

cCount = setCCount(c);

aCount = a;

Question 20

Given:
var fruits = List.of(“apple”, “orange”, “banana”, “lemon”);
You want to examine the first element that contains the character n. Which statement will accomplish this?

String result = fruits.stream().filter(f > f.contains(“n”)).findAny();

fruits.stream().filter(f > f.contains(“n”)).forEachOrdered(System.out::print);

Optional<String> result = fruits.stream().filter(f > f.contains (“n”)).findFirst ();

Optional<String> result = fruits.stream().anyMatch(f > f.contains(“n”));

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Total 175 questions Full Exam Access