1Z0-819 Exam Practice Questions prepared by Oracle Professionals [Q40-Q54]

July 28, 2025 latestexam 0 Comments

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1Z0-819 Exam Practice Questions prepared by Oracle Professionals

Use Valid New 1Z0-819 Questions – Top choice Help You Gain Success

The Oracle 1Z0-819 exam is ideal for developers who have experience in Java programming language and want to validate their skills. 1Z0-819 exam is also suitable for professionals who want to upgrade their knowledge to the latest version of Java. 1Z0-819 exam covers a wide range of topics, including Java fundamentals, object-oriented programming concepts, Java collections, concurrency, and I/O operations.

QUESTION 40
Which is a proper JDBC URL?

jdbe.mysql.com://localhost:3306/database

http://localhost.mysql.com:3306/database

http://localhost
mysql.jdbc:3306/database

jdbc:mysql://localhost:3306/database

QUESTION 41
Given:

and

Which two method definitions at line n1 in the Bar class compile? (Choose two.)

public List<Number> foo(Set<String> m) {…}

public List<Integer> foo(Set<CharSequence> m) {…}

public List<Integer> foo(TreeSet<String> m) {…}

public List<Object> foo(Set<CharSequence> m) {…}

public ArrayList<Integer> foo(Set<String> m) {…}

public ArrayList<Number> foo(Set<CharSequence> m) {…}

QUESTION 42
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 43
Given:

executed with this command:
java Main one two three
What is the result?

0). one

0). one1). two2). three

The compilation fails.

It creates an infinite loop printing:0). one1). two1). two…

A java.lang.NullPointerException is thrown.

QUESTION 44
Given:

Which two statements are true if the method is added to Bar? (Choose two.)

public Collection<String> foo(Collection<String> arg) { … } overrides Foo.foo.

public <T> Collection<T> foo(Stream<T> arg) { … } overloads Foo.foo.

public <T> List<T> foo(Collection<T> arg) { … } overrides Foo.foo.

public <T> Collection<T> foo(Collection<T> arg) { … } overloads Foo.foo.

public <T> Collection<T> bar(Collection<T> arg) { … } overloads Foo.foo.

public <T> Iterable<T> foo(Collection<T> arg) { … } overrides Foo.foo.

QUESTION 45
Given:

What is the type of the local variable x?

Character

char

String[ ]

String

QUESTION 46
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.

QUESTION 47
Given:

What is the result?

An exception is thrown at runtime.

Explanation
Graphical user interface, text, application, chat or text message Description automatically generated

QUESTION 48
A company has an existing Java app that includes two Java 8 jar files, sales-3.10. jar and clients-10.2.jar.
The jar file ,sales -8, 10, jar reference packages in clients -10.2 jar, but clients-10.2 jar does not reference packages in sales -8.10, jar.
They have decided to modularize clients-10.2.jar.
Which module-info. Java file would work for the new library version clients-10.3 jar?

QUESTION 49
Given:

What is the result?

The compilation fails due to an error in line 4.

The compilation fails due to an error in line 3.

The compilation fails due to an error in line 2.

The compilation fails due to an error in line 1.

The compilation fails due to an error in line 5.

QUESTION 50
Given:

What action ensures successful compilation?

Replace public Color(int c) with private Color(int c).

Replace int c; with private int c;.

Replace int c; with private final int c;.

Replace enum Color implements Serializable with public enum Color.

Replace enum Color with public enum Color.

QUESTION 51
Given:

What is the result?

null

nothing

It fails to compile.

java.lang.IllegalAccessException is thrown.

Student

QUESTION 52
Given:

executed with this command:
java Main one two three
What is the result?

0). one

0). one1). two2). three

The compilation fails.

It creates an infinite loop printing:0). one1). two1). two…

A java.lang.NullPointerException is thrown.

QUESTION 53
Given:

Which two allow a.Main to allocate a new Person? (Choose two.)

In Line 1, change the access modifier to privateprivate Person() {

In Line 1, change the access modifier to publicpublic Person() {

In Line 2, add extends Person to the Main classpublic class Main extends Person {and change Line 3 to create a new Main objectPerson person = new Main();

In Line 2, change the access modifier to protectedprotected class Main {

In Line 1, remove the access modifierPerson() {

QUESTION 54
Given:

You want to examine the items list it contains an item for which the variable count is below zero.
Which code fragment at line 1 accomplish this?

If (items.stream () .filter (i -> count < 0) . findFirst () ) {

If (items.stream () .filter (i -> count < 0) . findAny () ) {

If (items.stream () .allmatch (i -> count < 0) < 0) ) {

If (items.stream () .anymatch (i -> count < 0) < 0) ) {

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1Z0-819 Exam Practice Questions prepared by Oracle Professionals [Q40-Q54]

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