Real 1z1-819 Exam PDF Test Engine Practice Test Questions
Oracle 1z1-819 Real 2022 Braindumps Mock Exam Dumps
Understanding functional and technical aspects of Java SE 11 Developer Exam Number: 1Z0-819
The following will be discussed in the ORACLE 1Z0-006 exam dumps:
- Create and use interfaces, identify functional interfaces, and utilize private, static, and default methods
- Develop code that mitigates security threats such as denial of service, code injection, input validation and ensure data integrity
- Secure resource access including filesystems, manage policies and execute privileged code
- Define and use fields and methods, including instance, static and overloaded methods
- Initialize objects and their members using instance and static initialiser statements and constructors
- Declare and instantiate Java objects including nested class objects, and explain objects' - lifecycles (including creation, dereferencing by reassignment, and garbage collection)
- Understand variable scopes, apply encapsulation and make objects immutable
- Utilize polymorphism and casting to call methods, differentiate object type versus reference type
- Create and use enumerations
NEW QUESTION 102
Which two statements independently compile? (Choose two.)
- A. List<? super Float> list = new ArrayList<Double>();
- B. List<? super Short> list = new ArrayList<Number>();
- C. List<? extends Number> list = new ArrayList<Object>();
- D. List<? super Number> list = new ArrayList<Integer>();
- E. List<? extends Number> list = new ArrayList<Byte>();
Answer: B,E
Explanation:
NEW QUESTION 103
Given:
What is the result?
- A. nothing
- B. Student
- C. It fails to compile.
- D. java.lang.IllegalAccessException is thrown.
- E. null
Answer: C
NEW QUESTION 104
Given:
Which two changes need to be made to make this class compile? (Choose two.)
- A. Change Line 1 to an abstract class:public abstract class API {
- B. Change Line 1 to extend java.lang.AutoCloseable:public interface API extends AutoCloseable {
- C. Change Line 1 to a class:public class API {
- D. Change Line 2 to an abstract method:public abstract void checkValue(Object value)throws IllegalArgumentException;
- E. Change Line 2 access modifier to protected:protected void checkValue(Object value)throws IllegalArgumentException;
Answer: C,D
NEW QUESTION 105
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. B, because enquoting values provided by the calling code prevents SQL injection.
- C. A, because it sends exactly the value of user provided by the calling code.
- D. A and B are functionally equivalent.
- E. A, because it is unnecessary to enclose identifiers in quotes.
Answer: C
NEW QUESTION 106
Given:
Which two lines cause compilation errors? (Choose two.)
- A. line 9
- B. line 6
- C. line 7
- D. line 12
- E. line 8
Answer: B,C
NEW QUESTION 107
Given:
When run and all three files exist, what is the state of each reader on Line 1?
- A. The compilation fails.
- B. Only reader1 has been closed.
- C. All three readers are still open.
- D. All three readers have been closed.
Answer: A
NEW QUESTION 108
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 5 with widgetStream.filter((Widget a) > a.getPrice() > 20.00).
- B. Replace line 4 with Stream<Widget> widgetStream = widgets.stream();.
- C. Replace line 5 with widgetStream.filter(a > ((Widget)a).getPrice() > 20.00).
- D. Replace line 1 with List<Widget> widgetStream = widgets.stream();.
Answer: B,C
NEW QUESTION 109
Given:
What is the output?
- A. I am an array
- B. I am an object
- C. I am an object array
- D. The compilation fails due to an error in line 1.
Answer: B
NEW QUESTION 110
Given:
Examine these requirements:
* Eliminate code duplication.
* Keep constant the number of methods other classes may implement from this interface.
Which method can be added to meet these requirements?
- A. Option B
- B. Option D
- C. Option C
- D. Option A
Answer: A
NEW QUESTION 111
Given:
and
checkQuality(QUALITY.A);
and
Which code fragment can be inserted into the switch statement to print Best?
- A. QUALITY.A
- B. QUALITY.A.ValueOf()
- C. A
- D. A.toString()
Answer: C
NEW QUESTION 112
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().mapToInt (i -> i).average().parallel();
- C. double avg = numbers.parallelStream().mapToInt (m -> m).average().getAsDouble ();
- D. double avg = numbers.stream().average().getAsDouble();
- E. double avg = numbers.stream().parallel().averagingDouble(a -> a);
Answer: C,D
Explanation:
NEW QUESTION 113
Which two statements independently compile? (Choose two.)
- A. List<? super Float> list = new ArrayList<Double>();
- B. List<? super Short> list = new ArrayList<Number>();
- C. List<? extends Number> list = new ArrayList<Object>();
- D. List<? super Number> list = new ArrayList<Integer>();
- E. List<? extends Number> list = new ArrayList<Byte>();
Answer: B,E
Explanation:
NEW QUESTION 114
Which code fragment compiles?
- A. Option C
- B. Option B
- C. Option A
- D. Option D
Answer: D
Explanation:
NEW QUESTION 115
Which interface in the java.util.function package can return a primitive type?
- A. ToDoubleFunction
- B. Supplier
- C. LongConsumer
- D. BiFunction
Answer: A
NEW QUESTION 116
Given:
Which two statements are true if the method is added to Bar? (Choose two.)
- A. public Collection<String> foo(Collection<String> arg) { ... } overrides Foo.foo.
- B. public <T> Collection<T> foo(Stream<T> arg) { ... } overloads Foo.foo.
- C. public <T> List<T> foo(Collection<T> arg) { ... } overrides Foo.foo.
- D. public <T> Iterable<T> foo(Collection<T> arg) { ... } overrides Foo.foo.
- E. public <T> Collection<T> bar(Collection<T> arg) { ... } overloads Foo.foo.
- F. public <T> Collection<T> foo(Collection<T> arg) { ... } overloads Foo.foo.
Answer: C,D
NEW QUESTION 117
Given:
Which two interfaces can be used in lambda expressions? (Choose two.)
- A. MyInterface1
- B. MyInterface2
- C. MyInterface3
- D. MyInterface5
- E. MyInterface4
Answer: B,D
NEW QUESTION 118
Given:
Which is true?
- A. The compilation fails due to an error in line 4.
- B. The compilation succeeds.
- C. The compilation fails due to an error in line 10.
- D. The compilation fails due to an error in line 6.
- E. The compilation fails due to an error in line 9.
- F. The compilation fails due to an error in line 7.
- G. The compilation fails due to an error in line 2.
Answer: D
NEW QUESTION 119
Given the code fragment:
What is the result?
- A. A java.lang.NullPointerException is thrown.
- B. False
- C. A java.lang, UnsupportedOperationException is thrown.
- D. True
Answer: C
NEW QUESTION 120
Given:
Which statement is true?
- A. Only LocalDate class from java.time package is loaded.
- B. Class Tester does not need to import java.time.LocalDate because it is already visible to members of the package test.
- C. All classes from the package java.time. are loaded for the class Diary.
- D. Tester must import java.time.LocalDate in order to compile.
Answer: B
NEW QUESTION 121
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