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1Z0-819 dumps and 215 unique questions
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NEW QUESTION 30
Given:
executed using this command:
java Myclass My Car is red
What is the output of this class?
- A. My--is--java
- B. Car--red--My
- C. java--Myclass--My
- D. Myclass--Car--red
- E. My--Car--is
Answer: B
NEW QUESTION 31
Given:
What is the result?
- A. 6=(x+y)=6
- B. 6=(x+y)=42
- C. An exception is thrown at runtime.
- D. 42=(x+y)=42
- E. 42=(x+y)=6
Answer: B
Explanation:
NEW QUESTION 32
Given the content:
What Is the result?
A)
B)
C)
D)
E)
User Username
- A. Option A
- B. Option C
- C. Option
- D. Option B
- E. Option D
Answer: C,E
NEW QUESTION 33
Given:
What is the result?
- A. java.lang.ArrayIndexOutOfBoundsException thrown
- B. [0,0] = Red[1,0] = Black[2,0] = Blue
- C. [0,0] = Red[0,1] = White[1,0] = Black[1,1] = Blue[2,0] = Yellow[2,1] = Green[3,0] = Violet
- D. [0,0] = Red[0,1] = White[1,0] = Black[2,0] = Blue[2,1] = Yellow[2,2] = Green[2,3] = Violet
Answer: D
Explanation:
NEW QUESTION 34
Given:
This code results in a compilation error.
Which code should be inserted on line 1 for a successful compilation?
- A. Consumer consumer = (String args) -> System.out.print(args);
- B. Consumer consumer = System.out::print;
- C. Consumer consumer = var arg -> {System.out.print(arg);};
- D. Consumer consumer = msg -> { return System.out.print(msg); };
Answer: B
Explanation:
NEW QUESTION 35
Given the code fragment:
var pool = Executors.newFixedThreadPool(5);
Future outcome = pool.submit(() > 1);
Which type of lambda expression is passed into submit()?
- A. java.lang.Runnable
- B. java.util.function.Predicate
- C. java.util.function.Function
- D. java.util.concurrent.Callable
Answer: D
NEW QUESTION 36
Given the code fragment:
What is the result?
A)
B)
C)
D)
- A. Option A
- B. Option B
- C. Option C
- D. Option D
Answer: C
NEW QUESTION 37
Given:
Automobile.java
Car.java
What must you do so that the code prints 4?
- A. Remove the parameter from wheels method in line 3.
- B. Remove abstract keyword in line 1.
- C. Add @Override annotation in line 2.
- D. Replace the code in line 2 with Car ob = new Car();
Answer: C
Explanation:
NEW QUESTION 38
Given:
Which is true?
- A. The code compiles but does not print any result.
- B. The code throws an exception at runtime.
- C. The code does not compile.
- D. The code prints 25.
Answer: C
NEW QUESTION 39
Which statement about a functional interface is true?
- A. It is declared with a single default method.
- B. It cannot have any private methods and static methods.
- C. It must be defined with the public access modifier.
- D. It is declared with a single abstract method.
- E. It must be annotated with @FunctionalInterface.
Answer: D
NEW QUESTION 40
Given:
What is the output?
- A. I am an object
- B. I am an array
- C. The compilation fails due to an error in line 1.
- D. I am an object array
Answer: A
NEW QUESTION 41
Given the code fragment:
Path currentFile = Paths.get("/scratch/exam/temp.txt");
Path outputFile = Paths get("/scratch/exam/new.txt");
Path directory = Paths.get("/scratch/");
Files.copy(currentFile, outputFile);
Files.copy(outputFile, directory);
Files.delete (outputFile);
The /scratch/exam/temp.txt file exists. The /scratch/exam/new.txt and /scratch/new.txt files do not exist.
What is the result?
- A. /scratch/exam/new.txt and /scratch/new.txt are deleted.
- B. The program throws a NoSuchFileException.
- C. The program throws a FileaAlreadyExistsException.
- D. A copy of /scratch/exam/new.txt exists in the /scratch directory and /scratch/exam/new.txt is deleted.
Answer: B
Explanation:
NEW QUESTION 42
Given:
What is the result?
- A. Unknown
- B. TuesdayUnknown
- C. Working
- D. WorkingUnknown
- E. Tuesday
- F. The compilation fails.
Answer: A
Explanation:
NEW QUESTION 43
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?
- A. Option A
- B. Option B
- C. Option C
- D. Option D
Answer: C
NEW QUESTION 44
Which module-info.java is correct for a service provider for a print service defined in the PrintServiceAPI module?
module PrintServiceProvider {
- A. requires PrintServiceAPI;
uses com.provider.PrintService;
}
module PrintServiceProvider { - B. requires PrintServiceAPI;
exports org.printservice.spi.Print with
com.provider.PrintService;
} - C. requires PrintServiceAPI;
exports org.printservice.spi;
}
module PrintServiceProvider { - D. requires PrintServiceAPI;
provides org.printservice.spi.Print with
com.provider.PrintService;
}
module PrintServiceProvider {
Answer: C
NEW QUESTION 45
Given:
It is required that if p instanceof Pair then p.isValid() returns true.
Which is the smallest set of visibility changes to insure this requirement is met?
- A. isValid must be public.
- B. left and right must be private.
- C. setLeft and setRight must be protected.
- D. left, right, setLeft, and setRight must be private.
Answer: B
NEW QUESTION 46
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?
- A. [Peter, 25, null, 1000]
- B. [Peter, 30, Market Road]
- C. [Market Road, 1000]
- D. An exception is thrown at run time.
Answer: D
Explanation:
NEW QUESTION 47
Given:
What is the result?
- A. The compilation fails.
- B. SomeClass#methodA()SomeClass#methodA()
- C. A ClassCastException is thrown at runtime.
- D. SomeClass#methodA()AnotherClass#methodA()
- E. AnotherClass#methodA()SomeClass#methodA()
- F. AnotherClass#methodA()AnotherClass#methodA()
Answer: A
Explanation:
NEW QUESTION 48
Given:
executed with this command:
java Main one two three
What is the result?
- A. 0). one1). two2). three
- B. 0). one
- C. It creates an infinite loop printing:0). one1). two1). two...
- D. The compilation fails.
- E. A java.lang.NullPointerException is thrown.
Answer: C
NEW QUESTION 49
Given the formula to calculate a monthly mortgage payment:
and these declarations:
How can you code the formula?
- A. m = p * ((r * Math.pow(1 + r, n) / (Math.pow(1 + r, n)) - 1));
- B. m = p * (r * Math.pow(1 + r, n) / (Math.pow(1 + r, n) - 1));
- C. m = p * r * Math.pow(1 + r, n) / Math.pow(1 + r, n) - 1;
- D. m = p * (r * Math.pow(1 + r, n) / Math.pow(1 + r, n) - 1);
Answer: B
NEW QUESTION 50
Your organization makes mlib.jar available to your cloud customers. While working on a code cleanup project for mlib.jar, you see this method by customers:
What security measures should be added to this method so that it meets the requirements for a customer accessible method?
- A.
- B. Create a method that validates the hostName and portNumber parameters before opening the socket.
- C. Enclose the call to new Socket In an AccessController.doPrivileged block.
- D. Make enableService private.
Answer: C
NEW QUESTION 51
......
Understanding functional and technical aspects of Java SE 11 Developer Exam Number: 1Z0-819
The following will be discussed in the ORACLE 1Z0-006 dumps pdf:
- Use a Java array and List, Set, Map and Deque collections, including convenience methods
- Implement functional interfaces using lambda expressions, including interfaces from the java.util.function package
- Use Java Streams to filter, transform and process data
- Develop thread-safe code, using different locking mechanisms and java.util.concurrent API
- Create worker threads using Runnable and Callable, and manage concurrency using an ExecutorService and java.util.concurrent API
- Use generics, including wildcards
- Perform decomposition and reduction, including grouping and partitioning on sequential and parallel streams
- Sort collections and arrays using Comparator and Comparable interfaces
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