Pass Oracle 1z1-819 Exam with Guarantee Updated 225 Questions [Q39-Q60]

4 Feb, 2023 By admin 1z1-819, Oracle 0 Comments

Pass Oracle 1z1-819 Exam with Guarantee Updated 225 Questions [Q39-Q60]

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Pass Oracle 1z1-819 Exam with Guarantee Updated 225 Questions

Latest 1z1-819 Pass Guaranteed Exam Dumps Certification Sample Questions

NO.39 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?

Insert Comparator<Person> on line 1.
Insert
public int compare(Person p1, Person p2) {
return p1.name.compare(p2.name);
}
on line 2.

Insert Comparator<Person> on line 1.
Insert
public int compareTo(Person person) {
return person.name.compareTo(this.name);
}
on line 2.

Insert Comparable<Person> on line 1.
Insert
public int compare(Person p1, Person p2) {
return p1.name.compare(p2.name);
}
on line 2.

Insert Comparator<Person> on line 1.
Insert
public int compare(Person person) {
return person.name.compare(this.name);
}
on line 2.

NO.40 Given:

What is the result?

nothing

It fails to compile.

A java.lang.IllegalArgumentException is thrown.

NO.41 Given:

Which statement is true about the Fox class?

Fox class does not have to override inhabit method, so long as it does not try to call it.

Fox class does not have to override the inhabit method if Forest and Town provide compatible implementations.

Fox class must implement either Forest or Town interfaces, but not both.

The inhabit method implementation from the first interface that Fox implements will take precedence.

Fox class must provide implementation for the inhabit method.

NO.42 Given an application with a main module that has this module-info.java file:

Which two are true? (Choose two.)

A module providing an implementation of country.CountryDetails can be compiled and added without recompiling the main module.

A module providing an implementation of country.CountryDetails must have a requires main; directive in its module-info.java file.

An implementation of country.countryDetails can be added to the main module.

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.

To run without an error, the application must have at least one module in the module path that provides an implementation of country.CountryDetails.

NO.43 Given:

What is the result?

The compilation fails.

abdf

abd

adf

abcd

NO.44 Given:

What is the result?

[0,0] = Red[0,1] = White[1,0] = Black[1,1] = Blue[2,0] = Yellow[2,1] = Green[3,0] = Violet

[0,0] = Red[1,0] = Black[2,0] = Blue

java.lang.ArrayIndexOutOfBoundsException thrown

[0,0] = Red[0,1] = White[1,0] = Black[2,0] = Blue[2,1] = Yellow[2,2] = Green[2,3] = Violet

NO.45 Given:

What is required to make the Foo class thread safe?

No change is required.

Make the declaration of lock static.

Replace the lock constructor call with new ReentrantLock (true).

Move the declaration of lock inside the foo method.

NO.46 Given:

What is true?

A NoSuchElementExceptionis thrown at run time.

The compilation fails.

This should print the same result each time the program runs.

This may not print the same result each time the program runs.

NO.47 Given the code fragment:

What change on line 1 will make this code compile?

Add catch (L |N e).

Add catch (L |M N e).

Add catch (L e).

Add catch (N | L | M e).

Add catch (M |L e).

NO.48 Given the code fragment:

What is the result?

EUR -> 0.84
GBP -> 0.75
USD -> 1.00
CNY -> 6.42

The compilation fails.

CNY -> 6.42
EUR -> 0.84
GBP -> 0.75
USD -> 1.00

USD -> 1.00
GBP -> 0.75
EUR -> 0.84
CNY -> 6.42

Explanation
Text Description automatically generated

NO.49 Why would you choose to use a peek operation instead of a forEach operation on a Stream?

to process the current item and return void

to remove an item from the end of the stream

to process the current item and return a stream

to remove an item from the beginning of the stream

NO.50 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?

Option A

Option B

Option C

Option D

NO.51 Given the code fragment:

What change on line 1 will make this code compile?

Add catch (L |N e).

Add catch (L |M N e).

Add catch (L e).

Add catch (N | L | M e).

Add catch (M |L e).

NO.52 Given:

What will secure this code from a potential Denial of Service condition?

After Line 4, add indexReader.close().

On Line 3, enclose processData(dataReader) with try with resources.

After Line 3, add dataReader.close().

On Line 1, use try with resources when opening each dataReader.

Before Line 1, check the size of dataFiles to make sure it does not exceed a threshold.

NO.53 Given:

What is the result?

Keys: 4 Values: 4 Map: 0

Keys: 4 Values: 4 Map: 4

The compilation fails.

Keys: 0 Values: 0 Map:

Keys: 0 Values: 0 Map: 0

NO.54 Given the code fragment:

What is the result?

ab cd ef

An ArrayIndexOutOfBoundsException is thrown at runtime.

The compilation fails.

abc def

ad be cf

NO.55 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?

“eeee dd+”th of”+ MMM yyyy”

“eeee dd’th of’ MMM yyyy”

“eeee d+”th of”+ MMMM yyyy”

“eeee d’th of’ MMMM yyyy”

NO.56 Given:

What is the output?