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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:
- Create and use subclasses and superclasses, including abstract classes
- Read and write console and file data using I/O Streams
- Implement serialization and deserialization techniques on Java objects
- Create and use interfaces, identify functional interfaces, and utilize private, static, and default methods
- Initialize objects and their members using instance and static initialiser statements and constructors
- Deploy and execute modular applications, including automatic modules
- Utilize polymorphism and casting to call methods, differentiate object type versus reference type
- Declare and instantiate Java objects including nested class objects, and explain objects' lifecycles (including creation, dereferencing by reassignment, and garbage collection)
- Understand variable scopes, apply encapsulation and make objects immutable
- Create, apply, and process annotations
- Declare, use, and expose modules, including the use of services
NEW QUESTION 17
Given:
What is the output?
- A. I am an object array
- B. The compilation fails due to an error in line 1.
- C. I am an array
- D. I am an object
Answer: D
NEW QUESTION 18
Given:
What is the result?
- A. p1
- B. Joe Bloggs
- C. null
- D. The compilation fails due to an error in line 1.
Answer: D
Explanation:
NEW QUESTION 19
Given:
What is the result?
- A. appleorangegrapelemonapricotwatermelon
- B. appleapricotgrapelemonorangewatermelon
- C. watermelonorangelemongrapeapricotapple
- D. nothing
Answer: C
Explanation:
NEW QUESTION 20
Given:
Which two are secure serialization of these objects? (Choose two.)
- A. Define the serialPersistentFields array field.
- B. Make the class abstract.
- C. Declare fields transient.
- D. Implement only readResolve to replace the instance with a serial proxy and not writeReplace.
- E. Implement only writeReplace to replace the instance with a serial proxy and not readResolve.
Answer: A,D
NEW QUESTION 21
Which code fragment compiles?
- A. Option B
- B. Option C
- C. Option A
- D. Option D
Answer: D
Explanation:
NEW QUESTION 22
Given:
What action ensures successful compilation?
- A. Replace int c; with private int c;.
- B. Replace enum Color implements Serializable with public enum Color.
- C. Replace enum Color with public enum Color.
- D. Replace public Color(int c) with private Color(int c).
- E. Replace int c; with private final int c;.
Answer: D
Explanation:
NEW QUESTION 23
Given:
What is the result?
- A. 0
- B. nothing
- C. 0 4 9
- D. 1
Answer: B
NEW QUESTION 24
Given the code fragment:
What is the result?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: D
Explanation:
NEW QUESTION 25
Given:
What prevents this code from compiling?
- A. The calculateSurfaceAreamethod within Cylinder must be declared default.
- B. Cylinderis not properly calling the Rectangle and Ellipseinterfaces' calculateSurfaceArea methods.
- C. Cylinderrequires an implementation of calculateSurfaceAreawith two parameters.
- D. The calculateSurfaceAreamethod within Rectangle and Ellipserequires a publicaccess modifier.
Answer: B
NEW QUESTION 26
Given the code fragment:
What is the result?
A)
B)
C)
D)
- A. Option C
- B. Option B
- C. Option D
- D. Option A
Answer: A
NEW QUESTION 27
Given:
When is the readObject method called?
- A. after this object is serialized
- B. before this object is deserialized
- C. before this object Is serialized
- D. after this object is deserialized
- E. The method is never called.
Answer: D
NEW QUESTION 28
Which two safely validate inputs? (Choose two.)
- A. Use trusted domain-specific libraries to validate inputs.
- B. Assume inputs have already been validated.
- C. Accept only valid characters and input values.
- D. Modify the input values, as needed, to pass validation.
- E. Delegate numeric range checking of values to the database.
Answer: C,E
NEW QUESTION 29
Given:
What is the result?
- A. 10126 3
- B. 6910 3
- C. 0
- D. 6104 3
Answer: D
Explanation:
NEW QUESTION 30
Which set of commands is necessary to create and run a custom runtime image from Java source files?
- A. jar, jlink
- B. javac, jlink
- C. javac, jar
- D. java, jdeps
Answer: B
NEW QUESTION 31
Which code fragment prints 100 random numbers?
- A. Option B
- B. Option C
- C. Option A
- D. Option D
Answer: D
NEW QUESTION 32
Given:
Assuming that this code compiles correctly, which three statements are true? (Choose three.)
- A. A cannot be final.
- B. B cannot be abstract.
- C. A cannot be abstract.
- D. B cannot be final.
- E. B is a subtype of A.
- F. A is a subtype of B.
Answer: A,B,E
NEW QUESTION 33
Given:
executed with this command:
java Main one two three
What is the output of this class?
- A. A java.lang.ArrayIndexOutOfBoundsException is thrown.
- B. nothing
- C. 1) one
- D. 1) one2) two3) three
- E. The compilation fails.
Answer: D
NEW QUESTION 34
Given:
Which code, when inserted at one or more marked positions, would allow classes B and C to compile?
- A. public void z() { } // position 3
- B. @Override // position 2public void z() { } // position 3
- C. @Override // position 3void x () {} // position 3@Override // position 3public void z() { } // position 3
- D. implements A // position 1@Override // position 2
Answer: B
NEW QUESTION 35
Given this requirement:
Module vehicle depends on module part and makes its com.vehicle package available for all other modules.
Which module-info.java declaration meets the requirement?
- A. Option A
- B. Option B
- C. Option D
- D. Option C
Answer: A
NEW QUESTION 36
Given the code fragment:
What is the result?
- A. The compilation fails at line 13.
- B. The compilation fails at line
- C. 0
- D. 1
- E. The compilation fails at line 16.
Answer: D
NEW QUESTION 37
Given:
What is the result?
- A. Keys: 0 Values: 0 Map:
- B. Keys: 0 Values: 0 Map: 0
- C. Keys: 4 Values: 4 Map: 4
- D. The compilation fails.
- E. Keys: 4 Values: 4 Map: 0
Answer: C
NEW QUESTION 38
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 C
- B. Option B
- C. Option D
- D. Option A
Answer: A
NEW QUESTION 39
Given TripleThis.java:
Compiling TripleThis.java gives this compiler warning:
Note: TripleThis.java uses unchecked or unsafe operations.
Which two replacements done together remove this compiler warning?
- A. Replace line 12 with public static void printValue function<Integer> f, int num) {.
- B. Replace line 12 with public static int printValue function<Integer, Integer>, f, T num {.
- C. Replace line 9 with function<Integer> tripler = x-> - { return (Integer) X * 3 ; }.
- D. Replace line 12 with public static <T> void printValue (Function<T, T> f, T num ) {,
- E. Replace line 9 with function<Integer>, Integer> = X -> { return (integer) x * 3; }.
Answer: B,C
NEW QUESTION 40
Given:
Which three are true? (Choose three.)
- A. f2.foo(c) prints Ola Mundo!
- B. f1.foo(c) prints Bonjour le monde!
- C. f1.foo(c) prints Hello world!
- D. b1.foo(c) prints Hello world!
- E. b1.foo(c) prints Ola Mundo!
- F. f2.foo(c) prints Bonjour le monde!
- G. b1.foo(c) prints Bonjour le monde!
- H. f1.foo(c) prints Ola Mundo!
- I. f2.foo(c) prints Hello world!
Answer: C,E,F
NEW QUESTION 41
Given:
Which three are correct? (Choose three.)
- A. f1.foo(li) prints Bonjour le monde!
- B. b1.foo(li) prints Hello world!
- C. f2.foo(li) prints Bonjour le monde!
- D. b1.foo(li) prints Bonjour le monde!
- E. f2.foo(li) prints Hola Mundo!
- F. f1.foo(li) prints Hello world!
- G. f2.foo(li) prints Hello world!
- H. b1.foo(li) prints Hola Mundo!
- I. f1.foo(li) prints Hola Mundo!
Answer: A,B,H
NEW QUESTION 42
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