Real 1Z0-819 Exam PDF Test Engine Practice Test Questions
Oracle 1Z0-819 Real 2021 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 dumps:
- Create and use enumerations
- Understand variable scopes, apply encapsulation and make objects immutable
- Secure resource access including filesystems, manage policies and execute privileged code
- Initialize objects and their members using instance and static initialiser statements and constructors
- Create and use subclasses and superclasses, including abstract classes
- Define and use fields and methods, including instance, static and overloaded methods
- Develop code that mitigates security threats such as denial of service, code injection, input validation and ensure data integrity
- Declare and instantiate Java objects including nested class objects, and explain objectsâ - lifecycles (including creation, dereferencing by reassignment, and garbage collection)
- Create and use interfaces, identify functional interfaces, and utilize private, static, and default methods
- Utilize polymorphism and casting to call methods, differentiate object type versus reference type
NEW QUESTION 112
Which three annotation uses are valid? (Choose three.)
- A. var v = "Hello" + (@Interned) "World"
- B. Function<String, String> func = (var @NonNull x) > x.toUpperCase();
- C. var myString = (@NonNull String) str;
- D. Function<String, String> func = (@NonNull x) > x.toUpperCase();
- E. var obj = new @Interned MyObject();
- F. Function<String, String> func = (@NonNull var x) > x.toUpperCase();
Answer: B,D,E
NEW QUESTION 113
Given:
After which line can we insert assert i < 0 || values[i] <= values[i + 1]; to verify that the values array is partially sorted?
- A. after line 10
- B. after line 8
- C. after line 5
- D. after line 6
Answer: D
Explanation:
NEW QUESTION 114
Given:
What is required to make the Foo class thread safe?
- A. Move the declaration of lock inside the foo method.
- B. No change is required.
- C. Replace the lock constructor call with new ReentrantLock (true).
- D. Make the declaration of lock static.
Answer: C
Explanation:
Reference:
/how-to-make-java-class-thread-safe
NEW QUESTION 115
Given this requirement:
Module vehicle depends on module part and makes its com.vehicle package available for all other modules.
Which module-info.java declaration meets the requirement?
- A. Option C
- B. Option A
- C. Option B
- D. Option D
Answer: B
NEW QUESTION 116
Given:
What is the output?
- A. :APPLE:ORANGE:BANANA
appleorangebanana - B. :APPLE:ORANGE:BANANA
- C. APPLE:apple ORANGE:orange BANANA:banana
- D. apple:APPLE orange:ORANGE banana:BANANA
- E. appleorangebanana
:APPLE:ORANGE:BANANA
Answer: D
Explanation:
NEW QUESTION 117
Given:
Which two methods facilitate valid ways to read instance fields? (Choose two.)
- A. getCCount
- B. getTCount
- C. getGCount
- D. getTotalCount
- E. getACount
Answer: A,D
NEW QUESTION 118
Given:
LocalDate d1 = LocalDate.of(1997,2,7);
DateTimeFormatter dtf =
DateTimeFormatter.ofPattern( /*insert code here*/ );
System.out.println(dtf.format (d1));
Which pattern formats the date as Friday 7th of February 1997?
- A. "eeee d'th of' MMMM yyyy"
- B. "eeee d+"th of"+ MMMM yyyy"
- C. "eeee dd+"th of"+ MMM yyyy"
- D. "eeee dd'th of' MMM yyyy"
Answer: D
NEW QUESTION 119
Analyze the code:
Which two options can you insert inside println method to produce Global:namescope? (Choose two.)
- A. new Test().prefix+new Test().name
- B. Test.getName+prefix
- C. prefix+name
- D. Test.prefix+Test.name
- E. Test.prefix+Test.getName()
- F. prefix+Test.name
Answer: A,E
NEW QUESTION 120
Given:
Which two lines can replace line 1 so that the Y class compiles? (Choose two.)
- A. set(map.values());
- B. super.set(List<String> map)
- C. set(map)
- D. map.forEach((k, v) -> set(v)));
- E. super.set(map.values());
Answer: A,E
NEW QUESTION 121
Given:
Which three are true? (Choose three.)
- A. b1.foo(c) prints Ola Mundo!
- B. b1.foo(c) prints Hello world!
- C. b1.foo(c) prints Bonjour le monde!
- D. f1.foo(c) prints Ola Mundo!
- E. f2.foo(c) prints Hello world!
- F. f2.foo(c) prints Bonjour le monde!
- G. f2.foo(c) prints Ola Mundo!
- H. f1.foo(c) prints Hello world!
- I. f1.foo(c) prints Bonjour le monde!
Answer: A,F,H
NEW QUESTION 122
Given:
String originalPath = "data\\projects\\a-project\\..\\..\\another-project"; Path path = Paths.get(originalPath); System.out.print(path.normalize()); What is the result?
- A. data\another-project
- B. data\projects\a-project\another-project
- C. data\\projects\\a-project\\..\\..\\another-project
- D. data\projects\a-project\..\..\another-project
Answer: D
Explanation:
NEW QUESTION 123
Which two are successful examples of autoboxing? (Choose two.)
- A. Double d = 4;
- B. String a = "A";
- C. Integer e = 5;
- D. Long c = 23L;
- E. Float g = Float.valueOf(null);
- F. Float f = 6.0;
Answer: B,C
NEW QUESTION 124
Given:
executed with this command:
java Main one two three
What is the result?
- A. 0). one1). two2). three
- B. 0). one
- C. It creates an infinite loop printing:0). one1). two1). two...
- D. The compilation fails.
- E. A java.lang.NullPointerException is thrown.
Answer: C
NEW QUESTION 125
Given:
What action ensures successful compilation?
- A. Replace enum Color with public enum Color.
- B. Replace public Color(int c) with private Color(int c).
- C. Replace enum Color implements Serializable with public enum Color.
- D. Replace int c; with private int c;.
- E. Replace int c; with private final int c;.
Answer: B
Explanation:
NEW QUESTION 126
Given the code fragment:
Which can replace line 11?
- A. UnaryOperator<Interger >uo = (int x) -> x * 3;
- B. UnaryOperator<Interger > uo = (var x ) -> (x * 3);
- C. UnaryOperator<Interger >uo = x -> { return x * 3; };
- D. UnaryOperator<Interger >uo = var x -> { return x 3 ; };
Answer: B
NEW QUESTION 127
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 succeeds.
- C. The compilation fails because a final class cannot extend another class.
- D. The compilation fails because there is no zero args constructor defined in class X.
Answer: A
Explanation:
NEW QUESTION 128
Given:
List<String> longlist = List.of("Hello","World","Beat");
List<String> shortlist = new ArrayList<>();
Which code fragment correctly forms a short list of words containing the letter "e"?
- A. Option A
- B. Option B
- C. Option C
- D. Option D
Answer: C
NEW QUESTION 129
Given:
And the command:
java Main Helloworld
What is the result ?
- A. Input:
Then block until any input comes from System.in. - B. Input: Echo:
- C. Input:
Echo: Helloworld - D. Input: Helloworld Echo: Helloworld
- E. A NullPointerException is thrown at run time.
Answer: A
Explanation:
NEW QUESTION 130
Given:
What is the result?
- A. The compilation fails due to an error in line 3.
- B. The compilation fails due to an error in line 4.
- C. 0
- D. The compilation fails due to an error in line 2.
- E. 1
- F. The compilation fails due to an error in line 5.
- G. The compilation fails due to an error in line 1.
Answer: E
NEW QUESTION 131
Given an application with a main module that has this module-info.java file:
Which two are true? (Choose two.)
- A. A module providing an implementation of country.CountryDetails must have a requires main; directive in its module-info.java file.
- B. A module providing an implementation of country.CountryDetails can be compiled and added without recompiling the main module.
- C. To compile without an error, the application must have at least one module in the module source path that provides an implementation of country.CountryDetails.
- D. An implementation of country.countryDetails can be added to the main module.
- E. To run without an error, the application must have at least one module in the module path that provides an implementation of country.CountryDetails.
Answer: A,C
NEW QUESTION 132
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