1Z0-819 Certification Overview - [Jan 02, 2022] Latest 1Z0-819 PDF Dumps [Q108-Q130]

1Z0-819 Certification Overview - [Jan 02, 2022] Latest 1Z0-819 PDF Dumps

The Best Oracle 1Z0-819 Study Guides and Dumps of 2022

Oracle 1Z0-819 Exam Syllabus Topics:

Topic	Details
Topic 1	Secure resource access including filesystems, manage policies and execute privileged code Develop thread-safe code, using different locking mechanisms
Topic 2	Create and use subclasses and superclasses, including abstract classes Use local variable type inference, including as lambda parameters
Topic 3	Understand variable scopes, apply encapsulation and make objects immutable Connect to and perform database SQL operations, process query results using JDBC API
Topic 4	Create and use interfaces, identify functional interfaces Initialize objects and their members using instance and static initialiser statements and constructors
Topic 5	Implement serialization and deserialization techniques on Java objects Declare and instantiate Java objects including nested class objects
Topic 6	Handle text using String and StringBuilder classes Utilize polymorphism and casting to call methods, differentiate object type versus reference type
Topic 7	Use primitives and wrapper classes, including, operators, parentheses, type promotion and casting Sort collections and arrays using Comparator and Comparable interfaces
Topic 8	Define and use fields and methods, including instance, static and overloaded methods Working with Arrays and Collections
Topic 9	Deploy and execute modular applications, including automatic modules Implement functional interfaces using lambda expressions
Topic 10	Develop code that mitigates security threats such as denial of service Use Java Streams to filter, transform and process data

NEW QUESTION 108
Given:

You wants to make the reduction operation parallelized.
Which two modifications will accomplish this?

A. Replace line 1with int sum = numbers. ParallelStream ( ). Reduce (0, (n, m ) -> n + m);
B. Replace line 1 with int sum = numbers. Stream (). Interate (0, a -> a+1. Reduce (0, (n m) -> n+m);
C. Replace line 1 with int sum = numbers. Parallel ( ). Stream ( ). Reduce (0, (n, m ) -> n + m);
D. Replace line 1with int sum = number. Stream ( ) . flatMap (a -> a) .reduce (0, (n, m) -> n +m );
E. Replace line 1with int sum = number.stream. parallel ( ). Reduce (0, (n, m) -> n + m);

Answer: B,D

NEW QUESTION 109
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.)

A. double avg = numbers.stream().average().getAsDouble();
B. double avg = numbers.stream().parallel().averagingDouble(a -> a);
C. double avg = numbers.parallelStream().mapToInt (m -> m).average().getAsDouble ();
D. double avg = numbers.stream().collect(Collectors.averagingDouble(n -> n));
E. double avg = numbers.stream().mapToInt (i -> i).average().parallel();

Answer: A,C

Explanation:

NEW QUESTION 110
Given:

What is the result?

A. Joe Bloggs
B. null
C. p1
D. The compilation fails due to an error in line 1.

Answer: D

Explanation:

NEW QUESTION 111
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 112
Given:

What is the result?

A. Orange Juice Apple Pie Lemmon Ice Raspberry Tart
B. Orange Juice
C. The compilation fails.
D. The program prints nothing.

Answer: A

Explanation:

NEW QUESTION 113
Which two statements are correct about try blocks? (Choose two.)

A. catch blocks must be ordered from generic to specific exception types.
B. A finally block must be immediately placed after the try or catch blocks.
C. A finally block in a try-with-resources statement executes before the resources declared are closed.
D. A try block can have more than one catch block.
E. A try block must have a catch block and a finally block.

Answer: B,D

NEW QUESTION 114
Which two commands are used to identify class and module dependencies? (Choose two.)

A. jmod describe
B. jdeps --list-deps
C. java --show-module-resolution
D. jar --show-module-resolution
E. java Hello.java

Answer: B,C

NEW QUESTION 115
Given:

What is the type of x?

A. String
B. char
C. List<String>
D. List<Character>

Answer: A

NEW QUESTION 116
Given:

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

A. MyInterface5
B. MyInterface4
C. MyInterface2
D. MyInterface1
E. MyInterface3

Answer: C,E

NEW QUESTION 117
Given:
String originalPath = "data\\projects\\a-project\\..\\..\\another-project"; Path path = Paths.get(originalPath); System.out.print(path.normalize()); What is the result?

A. data\another-project
B. data\projects\a-project\another-project
C. data\\projects\\a-project\\..\\..\\another-project
D. data\projects\a-project\..\..\another-project

Answer: D

Explanation:

NEW QUESTION 118
What makes Java dynamic?

A. The Java compiler preprocesses classes to run on specific target platforms.
B. At runtime, classes are loaded as needed, and new code modules can be loaded on demand.
C. The Java compiler uses reflection to test if class methods are supported by resources of a target platform.
D. The runtime can process machine language sources as well as executables from different language compilers.

Answer: B

NEW QUESTION 119
Given the Person class with age and name along with getter and setter methods, and this code fragment:

What will be the result?

A. Tom Peter Aman
B. Tom Aman Peter
C. Aman Tom Peter
D. Aman Peter Tom

Answer: D

NEW QUESTION 120
Given:

Which three are true? (Choose three.)

A. b1.foo(c) prints Ola Mundo!
B. b1.foo(c) prints Hello world!
C. b1.foo(c) prints Bonjour le monde!
D. f1.foo(c) prints Ola Mundo!
E. f2.foo(c) prints Hello world!
F. f2.foo(c) prints Bonjour le monde!
G. f2.foo(c) prints Ola Mundo!
H. f1.foo(c) prints Hello world!
I. f1.foo(c) prints Bonjour le monde!

Answer: A,F,H

NEW QUESTION 121
Given a Memberclass with fields for nameand yearsMembership, including getters and setters and a print method, and a list of clubMembersmembers:

Which two Stream methods can be changed to use method references? (Choose two.)