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Practice on 2023 LATEST 1Z0-819 Exam Updated 262 Questions [Q71-Q87]

Practice on 2023 LATEST 1Z0-819 Exam Updated 262 Questions

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Oracle 1Z0-819 exam is a challenging exam that requires a thorough understanding of Java programming concepts and techniques. Candidates who pass 1Z0-819 exam can demonstrate their expertise in Java SE 11 and open up new career opportunities in the field of Java development. To succeed in 1Z0-819 exam, candidates should have a strong work ethic, a dedication to learning, and a passion for programming. With the right preparation and mindset, candidates can pass 1Z0-819 exam and become certified Java SE 11 developers.

NO.71 Given:

Which three are true? (Choose three.)

b1.foo(c) prints Bonjour le monde!

f1.foo(c) prints Hello world!

f1.foo(c) prints Old Mundo!

b1.foo(c) prints Hello world!

f2.foo(c) prints Old Mundo!

b1.foo(c) prints Old Mundo!

f2.foo(c) prints Bonjour le monde!

f2.foo(c) prints Hello world!

f1.foo(c) prints Bonjour le monde!

NO.72 Given:

What is the output?
banana orange apple lemon

—–
apple banana lemon orange
—–
—–

banana orange apple lemon
—–
apple banana lemon orange
—–

—–
—–

—–
banana orange apple lemon apple banana lemon orange
banana orange apple lemon apple banana lemon orange

—–
—–

NO.73 Given:

And the command:
java Main Helloworld
What is the result ?

Input: Echo:

Input: Helloworld Echo: Helloworld

Input:
Then block until any input comes from System.in.

Input:
Echo: Helloworld

A NullPointerException is thrown at run time.

NO.74 Given the code fragment:

What is the result?
A)

B)

C)

D)

Option A

Option B

Option C

Option D

NO.75 Which two describe reasons to modularize the JDK? (Choose two.)

easier to understand the Java language

improves security and maintainability

easier to expose implementation details

improves application robustness

easier to build a custom runtime linking application modules and JDK modules

NO.76 Given:

Which two lines cause compilation errors? (Choose two.)

line 12

line 6

line 9

line 8

line 7

NO.77 Given the code fragment:

Which can replace line 2?

UnaryOperator u = (int i) -> i * 2;

UnaryOperator u = (var i) -> (i * 2);

UnaryOperator u = var i -> { return i * 2; };

UnaryOperator u = i -> { return i * 2);

NO.78 Which two safely validate inputs? (Choose two.)

Delegate numeric range checking of values to the database.

Accept only valid characters and input values.

Use trusted domain-specific libraries to validate inputs.

Assume inputs have already been validated.

Modify the input values, as needed, to pass validation.

Reference:
/validating-input-using-java-util-scanner

NO.79 Given:

Which annotation should be used to remove warnings from compilation?

@SuppressWarnings on the main and print methods

@SuppressWarnings(“unchecked”) on main and @SafeVarargs on the print method

@SuppressWarnings(“rawtypes”) on main and @SafeVarargs on the print method

@SuppressWarnings(“all”) on the main and print methods

NO.80 Given:
List<String> list1 = new ArrayList<>();
list1.add(“A”);
list1.add(“B”);
List list2 = List.copyOf(list1);
list2.add(“C”);
List<List<String>> list3 = List.of(list1, list2);
System.out.println(list3);
What is the result?

[[A, B],[A, B]]

An exception is thrown at run time.

[[A, B], [A, B, C]]

[[A, B, C], [A, B, C]]

NO.81 What is the result?

9001: java.io.FileNotFoundException: MyFile.txt-MyFile.txt

9001: APPLICATION ERROR-9001-MyFile.txt
9001: java.io.FileNotFoundException: MyFile.txt-MyFile.txt

9001: APPLICATION ERROR-9001-MyFile.txt

Compilations fails at Line 1.

NO.82 Given:

What code must you insert on Line 1 to enable the code to print Hello world?

Hello.Greeting myG = new Hello.Greeting() myG.sayHi();

Hello myH = new Hello();
Hello.Greeting myG = myH.new Greeting();
myG.sayHi();

Hello myH = new Hello();
Hello.Greeting myG = myH.new Hello.Greeting();
myG.sayHi();

Hello myH = new Hello(); Greeting myG = new Greeting(); myG.sayHi ();

NO.83 Given:

What code inserted into class C would allow it to compile?

public void x() { }
public void z() { }

public void x() { }
protected void y() { super.y(); }
public void z() { }

void x() { }
public void y() { }
public void z() { }

void x() { super.y(); }
public void z() { }

void x() { }
public void z() { }

NO.84 Given:

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

Function function = String::toUpperCase;

UnaryOperator function = s -> s.toUpperCase();

UnaryOperator<String> function = String::toUpperCase;

Function<String> function = m -> m.toUpperCase();

NO.85 Given:

After which line can we insert assert i < 0 || values[i] <= values[i + 1]; to verify that the values array is partially sorted?

after line 8

after line 6

after line 5

after line 10

NO.86 Given:

executed using command:
java Hello “Hello World” Hello World
What is the output?

An exception is thrown at runtime.

Hello WorldHello World

Hello World Hello World

Hello WorldHelloWorld

HelloHello WorldHelloWorld

NO.87 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.)

double avg = numbers.stream().parallel().averagingDouble(a > a);

double avg = numbers.parallelStream().mapToInt (m > m).average().getAsDouble ();

double avg = numbers.stream().mapToInt (i > i).average().parallel();

double avg = numbers.stream().average().getAsDouble();

double avg = numbers.stream().collect(Collectors.averagingDouble(n > n));

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Practice on 2023 LATEST 1Z0-819 Exam Updated 262 Questions [Q71-Q87]