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Oracle 1z1-819 Certification exam is a comprehensive exam that measures the candidate's understanding of Java SE 11. It consists of 80 multiple-choice questions that have to be completed within 180 minutes. 1Z0-819 exam is available in multiple languages, and the passing score for the exam is 63%.
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.
NEW QUESTION # 85
Given:
public class X {
}
and
public final class Y extends X {
}
What is the result of compiling these two classes?
- A. The compilation fails because either class X or class Y needs to implement the toString() method.
- B. The compilation fails because a final class cannot extend another class.
- C. The compilation fails because there is no zero args constructor defined in class X.
- D. The compilation succeeds.
Answer: A
Explanation:
NEW QUESTION # 86
Given:
What is the result?
- A. 6=(x+y)=6
- B. 6=(x+y)=42
- C. An exception is thrown at runtime.
- D. 42=(x+y)=42
- E. 42=(x+y)=6
Answer: B
Explanation:
NEW QUESTION # 87
Given:
What is the result?
- A. 0
- B. An exception is thrown at runtime.
- C. 1
- D. 2
Answer: D
Explanation:
NEW QUESTION # 88
Given:
Which code fragment on line 1 makes the m map contain the employee with the highest salary for each neighborhood?
A)
B)
C)
D)
- A. Option C
- B. Option D
- C. Option A
- D. Option B
Answer: B
NEW QUESTION # 89
Which module-info.java is correct for a service provider for a print service defined in the PrintServiceAPI module?
- A. module PrintServiceProvider {
requires PrintServiceAPI;
exports org.printservice.spi;
} - B. module PrintServiceProvider {
requires PrintServiceAPI;
uses com.provider.PrintService;
} - C. module PrintServiceProvider {
requires PrintServiceAPI;
provides org.printservice.spi.Print with
com.provider.PrintService;
} - D. module PrintServiceProvider {
requires PrintServiceAPI;
exports org.printservice.spi.Print with
D18912E1457D5D1DDCBD40AB3BF70D5D
com.provider.PrintService;
}
Answer: A
NEW QUESTION # 90
Given:
Which two are secure serialization of these objects? (Choose two.)
- A. Implement only readResolve to replace the instance with a serial proxy and not writeReplace.
- B. Declare fields transient.
- C. Implement only writeReplace to replace the instance with a serial proxy and not readResolve.
- D. Define the serialPersistentFields array field.
- E. Make the class abstract.
Answer: A,D
NEW QUESTION # 91
Given:
Which three are true? (Choose three.)
- A. f2.foo(c) prints Bonjour le monde!
- B. f2.foo(c) prints Hello world!
- C. b1.foo(c) prints Ola Mundo!
- D. b1.foo(c) prints Bonjour le monde!
- E. f1.foo(c) prints Bonjour le monde!
- F. b1.foo(c) prints Hello world!
- G. f1.foo(c) prints Ola Mundo!
- H. f2.foo(c) prints Ola Mundo!
- I. f1.foo(c) prints Hello world!
Answer: A,C,I
NEW QUESTION # 92
Given:
What is the output?
- A. Exception
- B. 0
- C. 1
- D. 2
Answer: D
Explanation:
NEW QUESTION # 93
Given:
Which two statements can be added at line 1 in Bar to successfully compile it? (Choose two.)
- A. public ArrayList<Number> foo(Set<CharSequence> m) { ... }
- B. public List<Integer> foo(Set<String> m) { ... }
- C. public List<Integer> foo(Set<CharSequence> m) { ... }
- D. public List<Object> foo(Set<CharSequence> m) { ... }
- E. public ArrayList<Integer> foo(Set<String> m) { ... }
- F. public List<Integer> foo(TreeSet<String> m) { ... }
Answer: A,F
NEW QUESTION # 94
Given:
Which is true about line 1?
- A. It always executes the System.out::print statement.
- B. If the value is not present, a NoSuchElementException is thrown at run time.
- C. If the value is not present, nothing is done.
- D. If the value is not present, a NullPointerException is thrown at run time.
Answer: C
Explanation:
NEW QUESTION # 95
Given:
You wants to make the reduction operation parallelized.
Which two modifications will accomplish this?
- A. Replace line 1with int sum = number. Stream ( ) . flatMap (a -> a) .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. Parallel ( ). Stream ( ). Reduce (0, (n, m ) -> n + m);
- D. Replace line 1 with int sum = numbers. Stream (). Interate (0, a -> a+1. Reduce (0, (n m) -> n+m);
- E. Replace line 1with int sum = numbers. ParallelStream ( ). Reduce (0, (n, m ) -> n + m);
Answer: A,D
NEW QUESTION # 96
Given:
You want to implement the java. Io, serializable interface to the MypersisteneData class.
Which method should be overriden?
- A. nothing
- B. The readExternal and writeExternal method
- C. The readExternal method
- D. The writeExternal method
Answer: B
NEW QUESTION # 97
Which code fragment prints 100 random numbers?
- A. Option C
- B. Option D
- C. Option A
- D. Option B
Answer: B
NEW QUESTION # 98
Given:
Which two statements are true if the method is added to Bar? (Choose two.)
- A. public <T> Collection<T> foo(Collection<T> arg) { ... } overloads Foo.foo.
- B. public <T> Collection<T> bar(Collection<T> arg) { ... } overloads Foo.foo.
- C. public <T> Iterable<T> foo(Collection<T> arg) { ... } overrides Foo.foo.
- D. public <T> List<T> foo(Collection<T> arg) { ... } overrides Foo.foo.
- E. public Collection<String> foo(Collection<String> arg) { ... } overrides Foo.foo.
- F. public <T> Collection<T> foo(Stream<T> arg) { ... } overloads Foo.foo.
Answer: C,D
NEW QUESTION # 99
Given:
What is the result?
- A. 0
- B. 0 4 9
- C. 1
- D. nothing
Answer: D
NEW QUESTION # 100
Given:
Which three classes successfully override printOne()? (Choose three.)
- A. Option E
- B. Option F
- C. Option D
- D. Option A
- E. Option B
- F. Option C
Answer: C,D,F
NEW QUESTION # 101
What makes Java dynamic?
- A. The Java compiler preprocesses classes to run on specific target platforms.
- B. The runtime can process machine language sources as well as executables from different language compilers.
- C. The Java compiler uses reflection to test if class methods are supported by resources of a target platform.
- D. At runtime, classes are loaded as needed, and new code modules can be loaded on demand.
Answer: D
NEW QUESTION # 102
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. filter(Integer::equals(0))
- B. filter(Member::getYearsMembership() >= testMembershipLength)
- C. peek(Member::print)
- D. map(testName::compareToIgnoreCase)
Answer: B,D
NEW QUESTION # 103
Given:
and
Which two method definitions at line n1 in the Bar class compile? (Choose two.)
- A. public List<Integer> foo(TreeSet<String> m) {...}
- B. public ArrayList<Number> foo(Set<CharSequence> m) {...}
- C. public List<Number> foo(Set<String> m) {...}
- D. public ArrayList<Integer> foo(Set<String> m) {...}
- E. public List<Integer> foo(Set<CharSequence> m) {...}
- F. public List<Object> foo(Set<CharSequence> m) {...}
Answer: A,B
NEW QUESTION # 104
Given:
Why does D cause a compilation error?
- A. D does not define any method.
- B. D inherits a() only from C.
- C. D inherits a() from B and C but the return types are incompatible.
- D. D extends more than one interface.
Answer: C
NEW QUESTION # 105
Given:
Which two changes need to be made to make this class compile? (Choose two.)
- A. Change Line 1 to extend java.lang.AutoCloseable:public interface API extends AutoCloseable {
- B. Change Line 1 to a class:public class API {
- C. Change Line 2 access modifier to protected:protected void checkValue(Object value)throws IllegalArgumentException;
- D. Change Line 1 to an abstract class:public abstract class API {
- E. Change Line 2 to an abstract method:public abstract void checkValue(Object value)throws IllegalArgumentException;
Answer: B,E
NEW QUESTION # 106
Given:
Which two method implementations are correct, when inserted independently in line 1? (Choose two.)
- A. Option D
- B. Option C
- C. Option E
- D. Option A
- E. Option B
Answer: C,D
NEW QUESTION # 107
Given:
Which two constructors will compile and set the class field strings? (Choose two.)
- A. Option D
- B. Option E
- C. Option A
- D. Option B
- E. Option C
Answer: B,E
NEW QUESTION # 108
Given the code fragment:
What is the result?
A)
B)
C)
D)
- A. Option D
- B. Option A
- C. Option B
- D. Option C
Answer: D
NEW QUESTION # 109
......
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