[Sep 23, 2025] Pass Oracle Java SE 1Z0-819 Exam With 297 Questions [Q52-Q74]

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[Sep 23, 2025] Pass Oracle Java SE 1Z0-819 Exam With 297 Questions

Ultimate Guide to Prepare Free Oracle 1Z0-819 Exam Questions and Answer

The Oracle 1Z0-819 exam is aimed at developers who have at least 6 months of experience in Java programming and are familiar with the basics of Java SE 11. It consists of 60 multiple-choice questions and has a time limit of 150 minutes. 1Z0-819 exam is available in several languages, including English, Japanese, Chinese, and Korean. Passing the Oracle 1z1-819 exam is a great way to enhance your career opportunities as a Java developer and improve your credibility in the industry.

NEW QUESTION 52
Which two are functional interfaces? (Choose two.)

Option A

Option B

Option C

Option D

Option E

NEW QUESTION 53
Which two statements are true about the modular JDK? (Choose two.)

The foundational APIs of the Java SE Platform are found in the java.base module.

An application must be structured as modules in order to run on the modular JDK.

It is possible but undesirable to configure modules’ exports from the command line.

APIs are deprecated more aggressively because the JDK has been modularized.

NEW QUESTION 54
Given this enum declaration:

Examine this code:
System.out.println(Alphabet.getFirstLetter());
What code should be written at line 3 to make this code print A?

final String getFirstLetter() { return A.toString(); }

static String getFirstLetter() { return Alphabet.values()[1].toString(); }

static String getFirstLetter() { return A.toString(); }

String getFirstLetter() { return A.toString(); }

NEW QUESTION 55
Which three initialization statements are correct? (Choose three.)

int[][][] e = {{1,1,1},{2,2,2}};

short sh = (short)’A’;

float x = 1f;

byte b = 10;
char c = b;

String contact# = “(+2) (999) (232)”;

int x = 12_34;

boolean false = (4 != 4);

NEW QUESTION 56
Given:

What is the result?

2134

2143

214

234

NEW QUESTION 57
Given the code fragment:
Which two code snippets inserted independently inside println method print Mondial:domainmodel? (Choose two.)

Main.prefix + Main.name

prefix + getName

Main.prefix + Main.getName()

new Main().prefix + new Main().name

prefix + name

prefix + Main.name

NEW QUESTION 58
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

NEW QUESTION 59
Given the code fragment:

What is the result?

13 5 7 9

1 3 5 7 9 11

2 4 6 B 10

2 4 6 8

NEW QUESTION 60
Given:

What is the result?

nothing

It fails to compile.

A java.lang.IllegalArgumentException is thrown.

NEW QUESTION 61
Given these two classes:

And given this fragment:

Which describes the fragment?

It throws IllegalMonitorStateException.

It is subject to deadlock.

It is subject to livelock.

The code does not compile.

NEW QUESTION 62
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.

NEW QUESTION 63
Given:

What is the expected result of javac?

javac fails to compile the class and prints the error message, C:workspace4Mycar.java:1:error: package java does not exist

javac compiles Mycar.java without errors or warnings.

javac fails to compile the class and prints the error message, C:workspace4Mycar.java:1:error: expected import java.lang

javac fails to compile the class and prints the error message, Error: Could not find or load main class Mycar.class

NEW QUESTION 64
Given:

What is the output?

1 2 [1, 2, 3, four] 3 four

1 2 [1, 2, 3, 4] 3 4

1 2 [1, 2, 3, 4] 3 four

1 2 [1, 2, 3, four] 3 4

NEW QUESTION 65
Given:

and

Which code fragment on line 1 makes the s1 set contain the names of all employees born before January 1,
1989?

Option A

Option B

Option C

Option D

NEW QUESTION 66
Given:

What is the result?

The compilation fails on line 2.

An exception is thrown at run time.

The compilation fails on line 1.

a action

ab action

NEW QUESTION 67
Given:

What is the result?

The compilation fails.
[0). D, | 1). i, | 2). a]

[). o, | 1). a, | 2).]

[0). o, | 1). i, | 2). r]

ArrayIndexOutOfBounds Exception is thrown at runtime.

NEW QUESTION 68
Given:

What is the result?

[A, B, C]
followed by an exception thrown on line 11.

[A, B, C]
[A, B]

[A, B, C]
[A, B, C]

On line 9, an exception is thrown at run time.

Explanation
Graphical user interface, text, application Description automatically generated

NEW QUESTION 69
How many Thing objects are eligible for garbage collection in line 1?

NEW QUESTION 70
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”));

NEW QUESTION 71
Given:

And the command:
java Main Helloworld
What is the result ?

Input: Echo:

Input: Helloworld Echo: Helloworld

Input:
Then block until any input comes from System.in.

Input:
Echo: Helloworld

A NullPointerException is thrown at run time.

NEW QUESTION 72
Given:

Which statement is true about the Fox class?

Fox class does not have to override inhabit method, so long as it does not try to call it.

Fox class does not have to override the inhabit method if Forest and Town provide compatible implementations.

Fox class must implement either Forest or Town interfaces, but not both.

The inhabit method implementation from the first interface that Fox implements will take precedence.

Fox class must provide implementation for the inhabit method.

NEW QUESTION 73
Given:

What is known about the Sportscar class?

The Sportscar class is a subclass of Automobile and inherits its methods.

The Sportscar subclass cannot override setTurbo method from the superclass Automobile.

The Sportscar class is a superclass that has more functionality than the Automobile class.

The Sportscar class inherits the setTurbo method from the superclass Automobile.

NEW QUESTION 74
Given:

Which is true about line 1?

If the value is not present, a NoSuchElementException is thrown at run time.

It always executes the System.out::print statement.

If the value is not present, a NullPointerException is thrown at run time.

If the value is not present, nothing is done.

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Oracle 1Z0-819 certification exam is designed for developers who have a solid understanding of Java programming language and its core APIs. It is a professional-level certification that validates the skills and knowledge required to develop robust, scalable, and secure Java applications using the latest version of Java SE, which is Java SE 11.

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