Oracle 1Z0-819 Cert Guide PDF 100% Cover Real Exam Questions [Q101-Q123]

Oracle 1Z0-819 Cert Guide PDF 100% Cover Real Exam Questions

Pass 1Z0-819 Exam - Real Questions and Answers

NEW QUESTION # 101
Given:

This code results in a compilation error.
Which code should be inserted on line 1 for a successful compilation?

• A. Consumer consumer = System.out::print;
• B. Consumer consumer = (String args) > System.out.print(args);
• C. Consumer consumer = var arg > {System.out.print(arg);};
• D. Consumer consumer = msg -> { return System.out.print(msg); };

Answer: A

Explanation:

NEW QUESTION # 102
Which statement about access modifiers is correct?

• A. An instance variable can be declared with the static modifier.
• B. An inner class cannot be declared with the public modifier.
• C. An abstract method can be declared with the private modifier.
• D. A local variable can be declared with the final modifier.
• E. An interface can be declared with the protected modifier.

Answer: D

NEW QUESTION # 103
Given:

Which statement is true?

• A. Tester must import java.time.LocalDate in order to compile.
• B. All classes from the package java.time. are loaded for the class Diary.
• C. Only LocalDate class from java.time package is loaded.
• D. Class Tester does not need to import java.time.LocalDate because it is already visible to members of the package test.

Answer: D

NEW QUESTION # 104
Which code is correct?

• A. Runnable r = {System.out.println("Message")};
• B. Runnable r = > System.out.println("Message");
• C. Runnable r = "Message" > System.out.println();
• D. Runnable r = () -> {System.out.println("Message");};
• E. Runnable r = () > System.out::print;

Answer: D

NEW QUESTION # 105
Which two safely validate inputs? (Choose two.)

• A. Accept only valid characters and input values.
• B. Use trusted domain-specific libraries to validate inputs.
• C. Assume inputs have already been validated.
• D. Delegate numeric range checking of values to the database.
• E. Modify the input values, as needed, to pass validation.

Answer: A,D

NEW QUESTION # 106
Given:

Assuming that this code compiles correctly, which three statements are true? (Choose three.)

• A. B cannot be abstract.
• B. B cannot be final.
• C. A cannot be abstract.
• D. A is a subtype of B.
• E. A cannot be final.
• F. B is a subtype of A.

Answer: A,E,F

NEW QUESTION # 107
Given:

Which two independent changes will make the Main class compile? (Choose two.)

• A. Move the entire Student class declaration to a separate Java file, Student.java.
• B. Change line 2 to public Student(String classname).
• C. Change line 3 to Student student = new Student("Biology");.
• D. Change line 1 to public class Student {.
• E. Change line 1 to static class Student {.

Answer: B,C

Explanation:

NEW QUESTION # 108
Given:

Which two are correct? (Choose two.)

• A. Option A
• B. Option D
• C. Option C
• D. Option B

Answer: B,C

NEW QUESTION # 109
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 4 with Stream<Widget> widgetStream = widgets.stream();.
• B. Replace line 5 with widgetStream.filter(a > ((Widget)a).getPrice() > 20.00).
• C. Replace line 5 with widgetStream.filter((Widget a) > a.getPrice() > 20.00).
• D. Replace line 1 with List<Widget> widgetStream = widgets.stream();.

Answer: A,B

NEW QUESTION # 110
Given:

What is the result?

• A. Joe
  null
• B. Joe
  Marry
• C. null
  null
• D. null
  Mary

Answer: A

Explanation:

NEW QUESTION # 111
Why would you choose to use a peek operation instead of a forEach operation on a Stream?

• A. to process the current item and return void
• B. to remove an item from the end of the stream
• C. to process the current item and return a stream
• D. to remove an item from the beginning of the stream

Answer: C

NEW QUESTION # 112
Given:

Which statement on line 1 enables this code fragment to compile?

• A. Function<String> function = m -> m.toUpperCase();
• B. UnaryOperator<String> function = String::toUpperCase;
• C. Function function = String::toUpperCase;
• D. UnaryOperator function = s -> s.toUpperCase();

Answer: B

Explanation:

NEW QUESTION # 113
Which method throws an exception for not-a-number and infinite input values?
A)

B)

C)

D)

• A. Option A
• B. Option C
• C. Option B
• D. Option D

Answer: A

NEW QUESTION # 114
Given:

What is the result?

• A. 0
• B. 1
• C. The compilation fails.
• D. 2
• E. 3

Answer: A

NEW QUESTION # 115
Given:

You want the code to produce this output:
John
Joe
Jane
Which code fragment should be inserted on line 1 and line 2 to produce the output?

• A. Insert Comparator<Person> on line 1.
  Insert
  public int compare(Person person) {
  return person.name.compare(this.name);
  }
  on line 2.
• B. Insert Comparator<Person> on line 1.
  Insert
  public int compare(Person p1, Person p2) {
  return p1.name.compare(p2.name);
  }
  on line 2.
• C. Insert Comparator<Person> on line 1.
  Insert
  public int compareTo(Person person) {
  return person.name.compareTo(this.name);
  }
  on line 2.
• D. Insert Comparable<Person> on line 1.
  Insert
  public int compare(Person p1, Person p2) {
  return p1.name.compare(p2.name);
  }
  on line 2.

Answer: C

NEW QUESTION # 116
Given:
/code/a/Test.java
containing:

and
/code/b/Best.java
containing:
package b;
public class Best { }
Which is the valid way to generate bytecode for all classes?

• A. javac -d /code /code/a/Test.java
• B. java /code/a/Test.java /code/b/Best.java
• C. java /code/a/Test.java
• D. java -cp /code a.Test
• E. javac -d /code /code/a/Test.java /code/b/Best.java
• F. javac -d /code /code/a/Test

Answer: E

NEW QUESTION # 117
Given:

Which two methods facilitate valid ways to read instance fields? (Choose two.)

• A. getGCount
• B. getCCount
• C. getTCount
• D. getACount
• E. getTotalCount

Answer: B,E

NEW QUESTION # 118
Given:

What is the result?

• A. The compilation fails due to an error in line 3.
• B. 0
• C. The compilation fails due to an error in line 1.
• D. The compilation fails due to an error in line 4.
• E. The compilation fails due to an error in line 5.
• F. The compilation fails due to an error in line 2.
• G. 1

Answer: G

NEW QUESTION # 119

How many Thing objects are eligible for garbage collection in line 1?

• A. 0
• B. 1
• C. 2
• D. 3
• E. 4

Answer: A

NEW QUESTION # 120
Given:

What is the result?

• A. 0
• B. b3
• C. 1
• D. The compilation fails due to an error in line 1.
• E. 2
• F. b1
• G. b2

Answer: A

Explanation:

NEW QUESTION # 121
Given:

What is the result?

• A. [0,0] = Red[0,1] = White[1,0] = Black[1,1] = Blue[2,0] = Yellow[2,1] = Green[3,0] = Violet
• B. java.lang.ArrayIndexOutOfBoundsException thrown
• C. [0,0] = Red[0,1] = White[1,0] = Black[2,0] = Blue[2,1] = Yellow[2,2] = Green[2,3] = Violet
• D. [0,0] = Red[1,0] = Black[2,0] = Blue

Answer: C

Explanation:

NEW QUESTION # 122
Given:

Which two codes, independently, can be inserted in line to 1 compile?

• A. Abacus aba = (int m, int n) -> { m * n };
• B. Abacus aba = (int i, j) -> ( return i * j; };
• C. Abacus aba = (a, b) -> a * b;
• D. Abacus aba = (int e, int f) -> { return e * f; };
• E. Abacus aba = v, w -> x * y;

Answer: B,C

NEW QUESTION # 123
......

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