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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:
- Implement serialization and deserialization techniques on Java objects
- Utilize polymorphism and casting to call methods, differentiate object type versus reference type
- Create and use subclasses and superclasses, including abstract classes
- Declare and instantiate Java objects including nested class objects, and explain objects' lifecycles (including creation, dereferencing by reassignment, and garbage collection)
- Handle file system objects using java.nio.file API
- Create and use enumerations
- Declare, use, and expose modules, including the use of services
- Initialize objects and their members using instance and static initialiser statements and constructors
- Create and use interfaces, identify functional interfaces, and utilize private, static, and default methods
- Connect to and perform database SQL operations, process query results using JDBC API Annotations
- Read and write console and file data using I/O Streams
- Understand variable scopes, apply encapsulation and make objects immutable
- Define and use fields and methods, including instance, static and overloaded methods
- Deploy and execute modular applications, including automatic modules
- Create, apply, and process annotations
NEW QUESTION 49
Given:
What is the result?
- A. p1
- B. null
- C. The compilation fails due to an error in line 1.
- D. Joe Bloggs
Answer: C
Explanation:
NEW QUESTION 50
Given the code fragment:
What is the result?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: A
Explanation:
NEW QUESTION 51
Given:
What is the result?
- A. Keys: 0 Values: 0 Map: 0
- B. Keys: 0 Values: 0 Map:
- C. Keys: 4 Values: 4 Map: 4
- D. The compilation fails.
- E. Keys: 4 Values: 4 Map: 0
Answer: C
NEW QUESTION 52
Assuming the Widget class has a getPrice method, this code does not compile:
Which two statements, independently, would allow this code to compile? (Choose two.)
- A. Replace line 1 with List<Widget> widgetStream = widgets.stream();.
- B. Replace line 5 with widgetStream.filter((Widget a) > a.getPrice() > 20.00).
- C. Replace line 4 with Stream<Widget> widgetStream = widgets.stream();.
- D. Replace line 5 with widgetStream.filter(a > ((Widget)a).getPrice() > 20.00).
Answer: C,D
NEW QUESTION 53
Given:
Which is true?
- A. The compilation fails due to an error in line 7.
- B. The compilation fails due to an error in line 10.
- C. The compilation fails due to an error in line 2.
- D. The compilation fails due to an error in line 4.
- E. The compilation fails due to an error in line 6.
- F. The compilation succeeds.
- G. The compilation fails due to an error in line 9.
Answer: E
NEW QUESTION 54
Given:
Which one is correct?
- A. An IllegalThreadStateException is thrown at run time.
- B. The compilation fails.
- C. Four threads are created.
- D. Three threads are created.
Answer: A
Explanation:
NEW QUESTION 55
Given:
And the command:
java Main Helloworld
What is the result ?
- A. A NullPointerException is thrown at run time.
- B. Input: Echo:
- C. Input:
Then block until any input comes from System.in. - D. Input: Helloworld Echo: Helloworld
- E. Input:
Echo: Helloworld
Answer: C
Explanation:
NEW QUESTION 56
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 57
Given the code fragment:
What is the result?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: B
NEW QUESTION 58
Given:
What is the result?
- A. 2,54,54,5
- B. 2,34,54,3
- C. 2,34,54,5
- D. 2,34,34,5
Answer: A
Explanation:
NEW QUESTION 59
Given:
Which two interfaces can be used in lambda expressions? (Choose two.)
- A. MyInterface2
- B. MyInterface3
- C. MyInterface4
- D. MyInterface1
- E. MyInterface5
Answer: A,E
NEW QUESTION 60
Given:
You want the code to produce this output:
John
Joe
Jane
Which code fragment should be inserted on line 1 and line 2 to produce the output?
- A. Insert Comparator<Person> on line 1.
Insert
public int compare(Person p1, Person p2) {
return p1.name.compare(p2.name);
}
on line 2. - B. Insert Comparator<Person> on line 1.
Insert
public int compare(Person person) {
return person.name.compare(this.name);
}
on line 2. - C. Insert Comparable<Person> on line 1.
Insert
public int compare(Person p1, Person p2) {
return p1.name.compare(p2.name);
}
on line 2. - D. Insert Comparator<Person> on line 1.
Insert
public int compareTo(Person person) {
return person.name.compareTo(this.name);
}
on line 2.
Answer: D
NEW QUESTION 61
Given:
Which two statements are valid to be written in this interface? (Choose two.)
- A. public abstract void methodB();
- B. private abstract void methodC();
- C. public int x;
- D. public String methodD();
- E. final void methodG(){System.out.println("G");}
- F. public void methodF(){System.out.println("F");}
- G. final void methodE();
Answer: A,D
NEW QUESTION 62
Given:
What is the result?
- A. Unknown
- B. WorkingUnknown
- C. The compilation fails.
- D. TuesdayUnknown
- E. Working
- F. Tuesday
Answer: A
Explanation:
NEW QUESTION 63
Given:
and
What is the result?
Joe
- A. Marry
null - B. null
- C. Mary
Joe - D. null
null
Answer: D
Explanation:
NEW QUESTION 64
Given:
What is the result?
- A. The program prints nothing.
- B. The compilation fails.
- C. Orange Juice Apple Pie Lemmon Ice Raspberry Tart
- D. Orange Juice
Answer: C
Explanation:
NEW QUESTION 65
Given:
What is the result?
- A. nothing
- B. 0
- C. 1
- D. It fails to compile.
- E. A java.lang.IllegalArgumentException is thrown.
Answer: D
Explanation:
NEW QUESTION 66
Given:
Which two are secure serialization of these objects? (Choose two.)
- A. Define the serialPersistentFields array field.
- B. Make the class abstract.
- C. Implement only readResolve to replace the instance with a serial proxy and not writeReplace.
- D. Declare fields transient.
- E. Implement only writeReplace to replace the instance with a serial proxy and not readResolve.
Answer: A,C
NEW QUESTION 67
......
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