1Z0-819 Free Exam Study Guide! (Updated 297 Questions) [Q39-Q62]

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1Z0-819 Free Exam Study Guide! (Updated 297 Questions)

1Z0-819 Dumps for Oracle Java SE Certified Exam Questions and Answer

Oracle 1Z0-819 exam covers various topics such as Java Classes, Interfaces, and Objects, Lambda Expressions, Generics and Collections, Exceptions and Assertions, Module System, Concurrency, JDBC API, Annotations, I/O Fundamentals, and many more. 1Z0-819 exam consists of 80 multiple-choice questions, and the candidate will have 180 minutes to complete the exam. The Oracle 1Z0-819 certification is intended for Java developers who want to enhance their skills and knowledge in Java SE 11 and demonstrate their expertise to potential employers or clients.

Who should take the Java SE 11 Developer Exam Number: 1Z0-819

This exam helps students to understand the basic relational database concepts. Moreover, it will teach the students about data modeling concepts, building Entity Relationship Diagrams (ERDs), and mapping ERDs. Moreover, with this project-based learning techniques, students will be able to create and work with projects to design, implement, and demonstrate a database solution for a business or organization.

Oracle 1Z0-819 (Java SE 11 Developer) certification exam is a professional certification exam intended for developers who want to demonstrate their expertise in Java programming language. 1Z0-819 exam is designed to test the candidate’s skills in developing applications using Java SE 11. 1Z0-819 exam is intended for individuals who have experience in Java programming and want to validate their skills in the industry. Java SE 11 Developer certification exam covers a wide range of topics such as Java syntax, data types, concurrency, and class design.

Q39. Given the code fragment:

What is the output?

The compilation fails.

[-1, -2, -3]

[-3, -2, -1]

A runtime exception is thrown.

Q40. Given:
jdeps -jdkinternals C:workspace4SimpleSecurityjarclasses.jar
Which describes the expected output?

jdeps lists the module dependencies and the package names of all referenced JDK internal APIs. If any are found, the suggested replacements are output in the console.

jdeps outputs an error message that the -jdkinternals option requires either the -summary or the – verbose options to output to the console.

The -jdkinternals option analyzes all classes in the .jar and prints all class-level dependencies.

The -jdkinternals option analyzes all classes in the .jar for class-level dependencies on JDK internal APIs. If any are found, the results with suggested replacements are output in the console.

Explanation
-jdkinternals option analyzes all classes in the .jar for class-level dependencies on JDK internal APIs. If any are found, the results with suggested replacements are output in the console.

Q41. Your organization makes mlib.jar available to your cloud customers. While working on a new feature for mlib.jar, you see that the customer visible method public void enableService(String hostName, String portNumber) executes this code fragment

and you see this grant is in the security policy file:

What security vulnerability does this expose to your cloud customer’s code?

privilege escalation attack against the OS running the customer code

SQL injection attack against the specified host and port

XML injection attack against any mlib server

none because the customer code base must also be granted SocketPermission

denial of service attack against any reachable machine

Q42. Given:

executed using this command:
java Myclass My Car is red
What is the output of this class?

Car–red–My

My–Car–is

My–is–java

java–Myclass–My

Myclass–Car–red

Q43. Which module-info.java is correct for a service provider for a print service defined in the PrintServiceAPI module?

module PrintServiceProvider {
requires PrintServiceAPI;
exports org.printservice.spi;
}

module PrintServiceProvider {
requires PrintServiceAPI;
provides org.printservice.spi.Print with
com.provider.PrintService;
}

module PrintServiceProvider {
requires PrintServiceAPI;
uses com.provider.PrintService;
}

module PrintServiceProvider {
requires PrintServiceAPI;
exports org.printservice.spi.Print with
D18912E1457D5D1DDCBD40AB3BF70D5D
com.provider.PrintService;
}

Q44. Given this enum declaration:

Examine this code:
System.out.println(Letter.values()[1]);
What code should be written at line 5 for this code to print 200?

public String toString() { return String.valueOf(ALPHA.v); }

public String toString() { return String.valueOf(Letter.values()[1]); }

public String toString() { return String.valueOf(v); }

String toString() { return “200”; }

Q45. Given:

Which is true?

The compilation fails due to an error in line 6.

The compilation succeeds.

The compilation fails due to an error in line 4.

The compilation fails due to an error in line 10.

The compilation fails due to an error in line 7.

The compilation fails due to an error in line 9.

The compilation fails due to an error in line 2.

Q46. Given:

Which two interfaces can be used in lambda expressions? (Choose two.)

MyInterface1

MyInterface3

MyInterface5

MyInterface2

MyInterface4

Q47. Why would you choose to use a peekoperation instead of a forEachoperation on a Stream?

to process the current item and return void

to remove an item from the end of the stream

to process the current item and return a stream

to remove an item from the beginning of the stream

Explanation/Reference: https://www.baeldung.com/java-streams-peek-api

Q48. Please select the correct code snippet:

Q49. Which two statements are correct about try blocks? (Choose two.)

A try block can have more than one catch block.

A finally block in a try-with-resources statement executes before the resources declared are closed.

A finally block must be immediately placed after the try or catch blocks.

A try block must have a catch block and a finally block.

catch blocks must be ordered from generic to specific exception types.

Q50. Given:

Which two statements are valid to be written in this interface? (Choose two.)

public abstract void methodB();

final void methodG(){System.out.println(“G”);}

private abstract void methodC();

public String methodD();

public int x;

final void methodE();

public void methodF(){System.out.println(“F”);}

Q51. 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”

Q52. Which two are successful examples of autoboxing? (Choose two.)

String a = “A”;

Integer e = 5;

Float g = Float.valueOf(null);

Double d = 4;

Long c = 23L;

Float f = 6.0;

Q53. Which module-info.java is correct for a service provider for a print service defined in the PrintServiceAPI module?

module PrintServiceProvider {
requires PrintServiceAPI;
exports org.printservice.spi;
}

module PrintServiceProvider {
requires PrintServiceAPI;
provides org.printservice.spi.Print with
com.provider.PrintService;
}

module PrintServiceProvider {
requires PrintServiceAPI;
uses com.provider.PrintService;
}

module PrintServiceProvider {
requires PrintServiceAPI;
exports org.printservice.spi.Print with
D18912E1457D5D1DDCBD40AB3BF70D5D
com.provider.PrintService;

}

Q54. Given:
String originalPath = “data\projects\a-project\..\..\another-project”; Path path = Paths.get(originalPath); System.out.print(path.normalize()); What is the result?

dataanother-project

dataprojectsa-projectanother-project

data\projects\a-project\..\..\another-project

dataprojectsa-project….another-project

Q55. Given:

Which statement is true?

Class Tester does not need to import java.time.LocalDate because it is already visible to members of the package test.

All classes from the package java.time. are loaded for the class Diary.

Only LocalDate class from java.time package is loaded.

Tester must import java.time.LocalDate in order to compile.

Q56. 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.

Q57. Which two safely validate inputs? (Choose two.)

Delegate numeric range checking of values to the database.

Accept only valid characters and input values.

Use trusted domain-specific libraries to validate inputs.

Assume inputs have already been validated.

Modify the input values, as needed, to pass validation.

Q58. Given the code fragment:
Which two code snippets inserted independently inside print method print Mondial: domainmodal?

prefix + name

prefix + getName

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

prefix + Main, name

Main.prefix + Main.name

Main.prefix + Main.getName()

Q59. Given:

and the code fragment:

What is the result?
9001: java.io.FileNotFoundException: MyFile.txt-MyFile.txt

9001: APPLICATION ERROR-9001-MyFile.txt

9001: java.io.FileNotFoundException: MyFile.txt-MyFile.txt
9001: APPLICATION ERROR-9001-MyFile.txt

Compilations fails at Line 1.

Q60. Given:

You want to implement the java. Io, serializable interface to the MypersisteneData class.
Which method should be overriden?

The readExternal and writeExternal method

The readExternal method

The writeExternal method

nothing

Q61. Given:

What is the result?

Orange Juice

The compilation fails.

Orange Juice Apple Pie Lemmon Ice Raspberry Tart

The program prints nothing.

Q62. Given:

What is the result?

The compilation fails.

Y@<< hashcode>>

Null

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Who should take the Java SE 11 Developer Exam Number: 1Z0-819

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