[2025] New 1Z0-819 exam Free Sample Questions to Practice
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Oracle 1Z0-819 certification exam is designed for individuals who wish to demonstrate their knowledge and skills in Java programming. 1Z0-819 exam is intended for developers who have experience in creating applications using Java SE 11. Java SE 11 Developer certification is recognized globally and serves as a validation of a developer's expertise in Java programming.
Oracle 1Z0-819 exam is an excellent way for Java developers to validate their skills and knowledge and enhance their career prospects. By passing 1Z0-819 exam, developers can demonstrate their proficiency in Java SE 11 and gain recognition as an Oracle Certified Professional (OCP) Java SE 11 Developer.
NEW QUESTION # 70
Given:
What is the result?
- A. The compilation fails.
- B. Map: 4 Keys: 4 Values: 4
- C. Map: 0 Keys: 0 Values: 0
- D. Map: 4 Keys: 0 Values: 0
- E. Map: 0 Keys: 4 Values: 4
Answer: D
Explanation:
NEW QUESTION # 71
Given:
You want to obtain the Stream object on reading the file. Which code inserted on line 1 will accomplish this?
- A. var lines = Files.lines(Paths.get(INPUT_FILE_NAME));
- B. Stream lines = Files.readAllLines(Paths.get(INPUT_FILE_NAME));
- C. Stream<String> lines = Files.lines(INPUT_FILE_NAME);
- D. var lines = Files.readAllLines(Paths.get(INPUT_FILE_NAME));
Answer: D
NEW QUESTION # 72
Given the declaration:
Examine this code fragment:
/* Loc1 */ class ProcessOrders { ... }
Which two annotations may be applied at Loc1 in the code fragment? (Choose two.)
- A. @Resource(priority=0)
- B. @Resource(priority=100)
- C. @Resource(name="Customer1")
- D. @Resource
- E. @Resource(name="Customer1", priority=100)
Answer: A,B
NEW QUESTION # 73
Given:
What is the result?
- A. nothing
- B. 0
- C. 0 4 9
- D. 1
Answer: A
NEW QUESTION # 74
Which code fragment compiles?
- A. Option A
- B. Option D
- C. Option B
- D. Option C
Answer: B
Explanation:
NEW QUESTION # 75
Given:
What is known about the Sportscar class?
- A. The Sportscar class is a superclass that has more functionality than the Automobile class.
- B. The Sportscar class inherits the setTurbo method from the superclass Automobile.
- C. The Sportscar class is a subclass of Automobile and inherits its methods.
- D. The Sportscar subclass cannot override setTurbo method from the superclass Automobile.
Answer: C
NEW QUESTION # 76
Consider this method declaration:
A) "SET SESSION AUTHORIZATION " + user
B) "SET SESSION AUTHORIZATION " + stmt.enquoteIdentifier(user)
Is A or B the correct replacement for <EXPRESSION> and why?
- A. B, because all values provided by the calling code should be enquoted.
- B. A, because it is unnecessary to enclose identifiers in quotes.
- C. A and B are functionally equivalent.
- D. A, because it sends exactly the value of user provided by the calling code.
- E. B, because enquoting values provided by the calling code prevents SQL injection.
Answer: D
NEW QUESTION # 77
Given:
executed with this command:
java Main one two three
What is the result?
- A. The compilation fails.
- B. 0). one1). two2). three
- C. A java.lang.NullPointerException is thrown.
- D. 0). one
- E. It creates an infinite loop printing:0). one1). two1). two...
Answer: E
NEW QUESTION # 78
Which method throws an exception for not-a-number and infinite input values?
- A.
- B.
- C.
- D.
Answer: A
NEW QUESTION # 79
Given:
jdeps -jdkinternals C:\workspace4\SimpleSecurity\jar\classes.jar
Which describes the expected output?
- A. The -jdkinternals option analyzes all classes in the .jar and prints all class-level dependencies.
- B. The -jdkinternals option analyzes all classes in the .jar for class-level dependencies on JDK internal APIs. If any are found, the results with suggested replacements are output in the console.
- C. jdeps lists the module dependencies and the package names of all referenced JDK internal APIs. If any are found, the suggested replacements are output in the console.
- D. jdeps outputs an error message that the -jdkinternals option requires either the -summary or the - verbose options to output to the console.
Answer: B
Explanation:
-jdkinternals option analyzes all classes in the .jar for class-level dependencies on JDK internal APIs. If any are found, the results with suggested replacements are output in the console.
NEW QUESTION # 80
Given:
Which two changes need to be made to make this class compile? (Choose two.)
- A. Change Line 1 to a class:public class API {
- B. Change Line 1 to extend java.lang.AutoCloseable:public interface API extends AutoCloseable {
- C. Change Line 2 to an abstract method:public abstract void checkValue(Object value)throws IllegalArgumentException;
- D. Change Line 2 access modifier to protected:protected void checkValue(Object value)throws IllegalArgumentException;
- E. Change Line 1 to an abstract class:public abstract class API {
Answer: A,C
NEW QUESTION # 81
Given:
What is the output?
A)
B)
C)
D)
- A. option C
- B. option B
- C. option D
- D. option A
Answer: C
NEW QUESTION # 82
Given the code fragment:
What is the result?
- A. 0
- B. The program prints nothing.
- C. 1
- D. 01
- E. It prints 1 in the infinite loop.
Answer: B
NEW QUESTION # 83
Assuming the user credentials are correct, which expression will create a Connection?
- A.
- B.
- C.
- D.
- E.
Answer: E
NEW QUESTION # 84
Given:
Which code, when inserted at one or more marked positions, would allow classes B and C to compile?
- A. @Override // position 2public void z() { } // position 3
- B. public 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: A
NEW QUESTION # 85
Given:
Which two independent changes will make the Main class compile? (Choose two.)
- A. Change line 3 to Student student = new Student("Biology");.
- B. Move the entire Student class declaration to a separate Java file, Student.java.
- C. Change line 1 to static class Student {.
- D. Change line 2 to public Student(String classname).
- E. Change line 1 to public class Student {.
Answer: A,D
Explanation:
NEW QUESTION # 86
Given:
What is the result?
- A. An IndexOutOfBoundsException is thrown at runtime.
- B. is it 1
- C. this is it 2
- D. this is it 3
- E. is it 0
Answer: C
Explanation:
NEW QUESTION # 87
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 1with int sum = number.stream. parallel ( ). Reduce (0, (n, m) -> n + m);
- C. Replace line 1 with int sum = numbers. Stream (). Interate (0, a -> a+1. 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 1 with int sum = numbers. Parallel ( ). Stream ( ). Reduce (0, (n, m ) -> n + m);
Answer: C,D
NEW QUESTION # 88
......
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