Latest Mar 04, 2024 1Z0-819 Brain Dump: A Study Guide with Tips & Tricks for passing Exam
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Oracle 1z1-819 (Java SE 11 Developer) Exam is a certification exam for professionals seeking to demonstrate their expertise in Java development. 1Z0-819 exam covers a variety of topics, including Java language basics, object-oriented programming principles, core Java APIs, and more advanced topics such as multithreading, concurrency, and exception handling.
NEW QUESTION # 124
Given:
and the code fragment:
Which two Map objects group all employees with a salary greater than 30 by neighborhood? (Choose two.)
- A.
- B.
- C.
- D.
- E.
Answer: A
NEW QUESTION # 125
Given:
What is the result?
- A. 0
- B. 1
- C. nothing
- D. 0 4 9
Answer: C
NEW QUESTION # 126
Given:
What is the result?
- A. Joe
Marry - B. Joe
null - C. null
null - D. null
Mary
Answer: B
Explanation:
NEW QUESTION # 127
Given:
Which three classes successfully override printOne()? (Choose three.)
- A. Option A
- B. Option E
- C. Option D
- D. Option F
- E. Option B
- F. Option C
Answer: A,C,F
NEW QUESTION # 128
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 Comparable<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 p1, Person p2) {
return p1.name.compare(p2.name);
}
on line 2. - C. Insert Comparator<Person> on line 1.
Insert
public int compare(Person person) {
return person.name.compare(this.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 # 129
Given:
Which three are correct? (Choose three.)
- A. f2.foo(li) prints Hello world!
- B. b1.foo(li) prints Hola Mundo!
- C. f1.foo(li) prints Hola Mundo!
- D. b1.foo(li) prints Hello world!
- E. f1.foo(li) prints Hello world!
- F. f2.foo(li) prints Bonjour le monde!
- G. b1.foo(li) prints Bonjour le monde!
- H. f2.foo(li) prints Hola Mundo!
- I. f1.foo(li) prints Bonjour le monde!
Answer: B,D,I
NEW QUESTION # 130
Given this enum declaration:
Examine this code:
System.out.println(Letter.values()[1]);
What code should be written at line 5 for this code to print 200?
- A. String toString() { return "200"; }
- B. public String toString() { return String.valueOf(Letter.values()[1]); }
- C. public String toString() { return String.valueOf(v); }
- D. public String toString() { return String.valueOf(ALPHA.v); }
Answer: C
Explanation:
NEW QUESTION # 131
Given:
What will secure this code from a potential Denial of Service condition?
- A. Before Line 1, check the size of dataFiles to make sure it does not exceed a threshold.
- B. After Line 3, add dataReader.close().
- C. On Line 1, use try with resources when opening each dataReader.
- D. On Line 3, enclose processData(dataReader) with try with resources.
- E. After Line 4, add indexReader.close().
Answer: D
NEW QUESTION # 132
Given:
You want to obtain the Stream object on reading the file. Which code inserted on line 1 will accomplish this?
- A. Stream lines = Files.readAllLines(Paths.get(INPUT_FILE_NAME));
- B. var lines = Files.readAllLines(Paths.get(INPUT_FILE_NAME));
- C. Stream<String> lines = Files.lines(INPUT_FILE_NAME);
- D. var lines = Files.lines(Paths.get(INPUT_FILE_NAME));
Answer: B
NEW QUESTION # 133
Given:
What is the result?
- A. java.lang.IllegalAccessException is thrown.
- B. nothing
- C. Student
- D. null
- E. It fails to compile.
Answer: E
NEW QUESTION # 134
Given:
Which two are secure serialization of these objects? (Choose two.)
- A. Implement only writeReplace to replace the instance with a serial proxy and not readResolve.
- B. Make the class abstract.
- C. Implement only readResolve to replace the instance with a serial proxy and not writeReplace.
- D. Define the serialPersistentFields array field.
- E. Declare fields transient.
Answer: C,D
NEW QUESTION # 135
Given:
Which two are secure serialization of these objects? (Choose two.)
- A. Implement only writeReplace to replace the instance with a serial proxy and not readResolve.
- B. Make the class abstract.
- C. Implement only readResolve to replace the instance with a serial proxy and not writeReplace.
- D. Define the serialPersistentFields array field.
- E. Declare fields transient.
Answer: C,D
NEW QUESTION # 136
Given:
List<String> list1 = new ArrayList<>();
list1.add("A");
list1.add("B");
List list2 = List.copyOf(list1);
list2.add("C");
List<List<String>> list3 = List.of(list1, list2);
System.out.println(list3);
What is the result?
- A. [[A, B, C], [A, B, C]]
- B. [[A, B],[A, B]]
- C. [[A, B], [A, B, C]]
- D. An exception is thrown at run time.
Answer: D
Explanation:
NEW QUESTION # 137
Which statement about a functional interface is true?
- A. It must be annotated with @FunctionalInterface.
- B. It cannot have any private methods and static methods.
- C. It is declared with a single default method.
- D. It must be defined with the public access modifier.
- E. It is declared with a single abstract method.
Answer: E
NEW QUESTION # 138
Given the content from the course.txt file:
Which code fragment at line 1 prints the lines that contain Java from the course.txt file?
- A.
- B.
- C.
- D.
Answer: C
NEW QUESTION # 139
Given:
Which two interfaces can be used in lambda expressions? (Choose two.)
- A. MyInterface5
- B. MyInterface2
- C. MyInterface4
- D. MyInterface1
- E. MyInterface3
Answer: B,E
NEW QUESTION # 140
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.)
- A. peek(Member::print)
- B. filter(Member::getYearsMembership() >= testMembershipLength)
- C. map(testName::compareToIgnoreCase)
- D. filter(Integer::equals(0))
Answer: B,C
NEW QUESTION # 141
Given:
Which statement is true about the Fox class?
- A. Fox class does not have to override the inhabit method if Forest and Town provide compatible implementations.
- B. The inhabit method implementation from the first interface that Fox implements will take precedence.
- C. Fox class must implement either Forest or Town interfaces, but not both.
- D. Fox class must provide implementation for the inhabit method.
- E. Fox class does not have to override inhabit method, so long as it does not try to call it.
Answer: A
NEW QUESTION # 142
Given:
Which two lines of code when inserted in line 1 correctly modifies instance variables? (Choose two.)
- A. setGCount(g);
- B. aCount = a;
- C. tCount = tCount;
- D. cCount = setCCount(c);
- E. setCCount(c) = cCount;
Answer: B,C
NEW QUESTION # 143
......
Oracle 1Z0-819 certification exam is a crucial step in the Java certification path and is highly recognized by employers globally. 1Z0-819 exam is a comprehensive test that covers various topics, and passing it requires a strong understanding of Java programming concepts and techniques. Candidates can take advantage of various training programs, practice tests, and study materials offered by Oracle to prepare for 1Z0-819 exam.
Oracle 1Z0-819 (Java SE 11 Developer) Exam is a certification exam designed for developers who want to demonstrate their knowledge and skills in developing applications using Java SE 11. 1Z0-819 exam covers a wide range of topics related to Java programming language, such as Java syntax and data types, control structures, object-oriented programming concepts, and exception handling. It also covers topics related to Java SE 11 API, such as collections, concurrency, input/output, and networking.
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