Oracle 1z1-819 Deluxe Study Guide with Online Test Engine [Q86-Q101]

Oracle 1z1-819 Deluxe Study Guide with Online Test Engine

1z1-819 dumps review – Professional Quiz Study Materials

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Q86. 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.

Q87. Given:

What is the result?

 The compilation fails.

 1.99,2.99,0

 1.99,2.99,0.0

 1.99,2.99

Q88. A bookstore’s sales are represented by a list of Sale objects populated with the name of the customer and the books they purchased.
public class Sale {
private String customer;
private List<Book> items;
// constructor, setters and getters not shown
}
public class Book {
private String name;
private double price;
// constructor, setters and getters not shown
}
Given a list of Sale objects, tList, which code fragment creates a list of total sales for each customer in ascending order?

 Option A

 Option B

 Option C

 Option D

Q89. 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.

Q90. 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.

Q91. 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));

Q92. Given:

Which two lines can replace line 1 so that the Y class compiles? (Choose two.)

 map.forEach((k, v) -> set(v)));

 set(map.values());

 super.set(List<String> map)

 super.set(map.values());

 set(map)

Q93. 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.

Q94. 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;

}

Q95. Given:

What is the result?

 JoeMarry

 Joenull

 nullnull

 nullMary

Q96. 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.

Q97. Given:

What prevents this code from compiling?

 The calculateSurfaceAreamethod within Cylinder must be declared default.

 Cylinderis not properly calling the Rectangle and Ellipseinterfaces’ calculateSurfaceArea methods.

 Cylinderrequires an implementation of calculateSurfaceAreawith two parameters.

 The calculateSurfaceAreamethod within Rectangle and Ellipserequires a publicaccess modifier.

Q98. Which two statements are correct about modules in Java? (Choose two.)

 java.base exports all of the Java platforms core packages.

 module-info.java can be placed in any folder inside module-path.

 A module must be declared in module-info.java file.

 module-info.java cannot be empty.

 By default, modules can access each other as long as they run in the same folder.

Q99. Given the code fragment:

You must define the A exception class. The program execution must be terminated if the condition at line 19 is true and an a exception is thrown at line 20.
Which code fragment at line n1 defines A as per the requirement?

 Class A extends Exception {

 Class A extends RuntimeException {

 Class A extends Throwable {

 Class A extends ArithmeticException {

Q100. Given:

Which three are correct? (Choose three.)

 b1.foo(li) prints Hello world!

 f1.foo(li) prints Bonjour le monde!

 f1.foo(li) prints Hello world!

 f1.foo(li) prints Hola Mundo!

 b1.foo(li) prints Bonjour le monde!

 f2.foo(li) prints Hola Mundo!

 f2.foo(li) prints Bonjour le monde!

 b1.foo(li) prints Hola Mundo!

 f2.foo(li) prints Hello world!

Q101. 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.

 Loading …

Holding the Oracle 1Z0-819 certification demonstrates that you have the skills and knowledge required to develop robust and efficient Java applications using the latest Java technologies. Java SE 11 Developer certification is recognized worldwide by employers and gives you a competitive edge in the job market. It also provides a foundation for further advanced Java certifications. To prepare for the exam, candidates can take online courses, attend training sessions or self-study using books and practice exams.

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