2023 Realistic Verified Free Oracle 1z1-819 Exam Questions
1z1-819 Real Exam Questions and Answers FREE
To prepare for the exam, candidates can take advantage of a range of study materials, including official Oracle documentation, online courses, practice exams, and study guides. It is recommended that candidates have at least six months of experience in Java programming before attempting the exam.
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NEW QUESTION # 40
Assume ds is a DataSource and the EMP table is defined appropriately.
What does executing this code fragment do?
- A. inserts one row (101, 'SMITH', 'HR')
- B. inserts two rows (101, 'SMITH', 'HR') and (102, 'JONES', 'HR')
- C. inserts two rows (101, 'SMITH', 'HR') and (102, 'JONES', NULL)
- D. throws a SQLException
Answer: A
NEW QUESTION # 41
Given:
Assuming that this code compiles correctly, which three statements are true? (Choose three.)
- A. A is a subtype of B.
- B. B cannot be final.
- C. A cannot be abstract.
- D. A cannot be final.
- E. B cannot be abstract.
- F. B is a subtype of A.
Answer: D,E,F
NEW QUESTION # 42
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().collect(Collectors.averagingDouble(n -> n));
- B. double avg = numbers.stream().parallel().averagingDouble(a -> a);
- C. double avg = numbers.stream().average().getAsDouble();
- D. double avg = numbers.parallelStream().mapToInt (m -> m).average().getAsDouble ();
- E. double avg = numbers.stream().mapToInt (i -> i).average().parallel();
Answer: C,D
Explanation:
NEW QUESTION # 43
Given the code fragment:
What is the result?
- A. The compilation fails.
- B. USD -> 1.00
GBP -> 0.75
EUR -> 0.84
CNY -> 6.42 - C. EUR -> 0.84
GBP -> 0.75
USD -> 1.00
CNY -> 6.42 - D. CNY -> 6.42
EUR -> 0.84
GBP -> 0.75
USD -> 1.00
Answer: A
Explanation:
Explanation
Text Description automatically generated
NEW QUESTION # 44
Given:
Which annotation should be used to remove warnings from compilation?
- A. @SuppressWarnings("unchecked") on main and @SafeVarargs on the print method
- B. @SuppressWarnings("rawtypes") on main and @SafeVarargs on the print method
- C. @SuppressWarnings on the main and print methods
- D. @SuppressWarnings("all") on the main and print methods
Answer: A
Explanation:
NEW QUESTION # 45
Given the code fragment:
Which code fragment replaces the for statement?
- A. intstream.rangeclosed(l, 100).mapToObj{FizzBuzz::convert).forEach(System.out::printIn);
- B. IntStream.range(1, 100).mapToObj(FizzBuzz::convert).forEach(System.out::println);
- C. IntStream.ranged, 100).map(FizzBuzz::convert).forEach(System.out::println);
- D. IntStream.rangeClosed(l, 100).map(FizzBuzz::convert).forEach(System.out::println);
Answer: D
NEW QUESTION # 46
Given:
Which two lines inserted in line 1 will allow this code to compile? (Choose two.)
- A. protected void walk(){}
- B. public abstract void walk();
- C. private void walk(){}
- D. abstract void walk();
- E. void walk(){}
Answer: A,B
NEW QUESTION # 47
Given:
and
What is the result?
- A. The compilation fails.
- B. A NullPointerException is thrown at run time.
- C. 1
1
1 - D. 1
Null
null - E. A ClassCastException is thrown at run time.
Answer: A
Explanation:
NEW QUESTION # 48
Given:
What is the result?
- A. Tuesday
- B. Working
- C. WorkingUnknown
- D. TuesdayUnknown
- E. The compilation fails.
- F. Unknown
Answer: F
Explanation:
NEW QUESTION # 49
Which describes a characteristic of setting up the Java development environment?
- A. The Java development environment is set up for all operating systems by default.
- B. You set up the Java development environment for a specific operating system when you install the JDK.
- C. Setting up the Java development environment requires that you also install the JRE.
- D. Setting up the Java development environment occurs when you install an IDE before the JDK.
Answer: D
NEW QUESTION # 50
Which is a proper JDBC URL?
- A. http://localhost
mysql.jdbc:3306/database - B. http://localhost.mysql.com:3306/database
- C. jdbc:mysql://localhost:3306/database
- D. jdbe.mysql.com://localhost:3306/database
Answer: C
NEW QUESTION # 51
Given:
This code results in a compilation error.
Which code should be inserted on line 1 for a successful compilation?
- A. Consumer consumer = msg -> { return System.out.print(msg); };
- B. Consumer consumer = (String args) > System.out.print(args);
- C. Consumer consumer = var arg > {System.out.print(arg);};
- D. Consumer consumer = System.out::print;
Answer: D
Explanation:
NEW QUESTION # 52
Given the code fragment:
What is the result?
- A. The compilation fails.
- B. USD -> 1.00
GBP -> 0.75
EUR -> 0.84
CNY -> 6.42 - C. EUR -> 0.84
GBP -> 0.75
USD -> 1.00
CNY -> 6.42 - D. CNY -> 6.42
EUR -> 0.84
GBP -> 0.75
USD -> 1.00
Answer: A
Explanation:
NEW QUESTION # 53
Given the code fragment:
List<Integer> list = List.of(11,12,13,12,13);
Which statement causes a compile time error?
- A. Integer a = Integer.valueOf(list.get(0));
- B. Double e = Double.valueOf(list.get(0));
- C. Integer b = list.get(0);
- D. int c =list.get(0);
- E. Double d = list.get(0);
- F. double f = list.get(0);
Answer: A
NEW QUESTION # 54
Given:
and omitting the throws FooException clause results in a compilation error.
Which statement is true about FooException?
- A. FooException is a subclass of RuntimeError.
- B. The body of foo can throw FooException or one of its subclasses.
- C. The body of foo can only throw FooException.
- D. FooException is unchecked.
Answer: B
NEW QUESTION # 55
Given:
Which two statements are valid to be written in this interface? (Choose two.)
- A. final void methodE();
- B. private abstract void methodC();
- C. public abstract void methodB();
- D. public void methodF(){System.out.println("F");}
- E. public String methodD();
- F. final void methodG(){System.out.println("G");}
- G. public int x;
Answer: C,E
NEW QUESTION # 56
Analyze the code:
Which two options can you insert inside println method to produce Global:namescope? (Choose two.)
- A. Test.prefix+Test.name
- B. prefix+name
- C. prefix+Test.name
- D. Test.prefix+Test.getName()
- E. new Test().prefix+new Test().name
- F. Test.getName+prefix
Answer: D,E
NEW QUESTION # 57
Given:
Which three classes successfully override showFirst ()?
- A.
- B.
- C.
- D.
- E.
- F.
Answer: C
NEW QUESTION # 58
Given:
What is the result?
- A. It throws a runtime exception.
- B. Value of Euler = 2.71828
- C. The code does not compile.
- D. Value of Euler = "2.71828"
Answer: C
NEW QUESTION # 59
Given:
Which two allow a.Main to allocate a new Person? (Choose two.)
- A. In Line 1, change the access modifier to publicpublic Person() {
- B. In Line 2, add extends Person to the Main classpublic class Main extends Person {and change Line 3 to create a new Main objectPerson person = new Main();
- C. In Line 1, remove the access modifierPerson() {
- D. In Line 1, change the access modifier to privateprivate Person() {
- E. In Line 2, change the access modifier to protectedprotected class Main {
Answer: A,B
NEW QUESTION # 60
......
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