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1z0-819 Sample Questions Answers

Questions 4

Which interface in the java.util.function package can return a primitive type?

Options:

A.

ToDoubleFunction

B.

Supplier

C.

BiFunction

D.

LongConsumer

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Questions 5

Given:

What is the output?

Options:

A.

1 2 [1, 2, 3, four] 3 four

B.

1 2 [1, 2, 3, 4] 3 4

C.

1 2 [1, 2, 3, 4] 3 four

D.

1 2 [1, 2, 3, four] 3 4

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Questions 6

Given:

Which is true about line 1?

Options:

A.

If the value is not present, a NoSuchElementException is thrown at run time.

B.

It always executes the System.out::print statement.

C.

If the value is not present, a NullPointerException is thrown at run time.

D.

If the value is not present, nothing is done.

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Questions 7

Which two describe reasons to modularize the JDK? (Choose two.)

Options:

A.

easier to understand the Java language

B.

improves security and maintainability

C.

easier to expose implementation details

D.

improves application robustness

E.

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

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Questions 8

Given:

Which statement is true?

Options:

A.

Class Tester does not need to import java.time.LocalDate because it is already visible to members of the package test.

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.

Tester must import java.time.LocalDate in order to compile.

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Questions 9

Given:

What is the result?

Options:

A.

The compilation fails.

B.

abdf

C.

abd

D.

adf

E.

abcd

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Questions 10

Given:

What is the result?

Options:

A.

6910 3

B.

10126 3

C.

3

D.

6104 3

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Questions 11

Analyze the code:

Which two options can you insert inside println method to produce Global:namescope? (Choose two.)

Options:

A.

Test.prefix+Test.name

B.

new Test().prefix+new Test().name

C.

Test.prefix+Test.getName()

D.

Test.getName+prefix

E.

prefix+Test.name

F.

prefix+name

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Questions 12

Given:

What is the result?

Options:

A.

42

B.

The compilation fails due to an error in line 4.

C.

17

D.

The compilation fails due to an error in line 3.

E.

The compilation fails due to an error in line 2.

F.

The compilation fails due to an error in line 1.

G.

The compilation fails due to an error in line 5.

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Questions 13

Given:

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

values array is partially sorted?

Options:

A.

after line 8

B.

after line 6

C.

after line 5

D.

after line 10

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Questions 14

Given:

This code results in a compilation error.

Which code should be inserted on line 1 for a successful compilation?

Options:

A.

Consumer consumer = msg -> { return System.out.print(msg); };

B.

Consumer consumer = var arg −> {System.out.print(arg);};

C.

Consumer consumer = (String args) −> System.out.print(args);

D.

Consumer consumer = System.out::print;

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Questions 15

Given:

A) An exception is thrown at run time.

B)

C) The compilation fails due to an error on line 2.

D) The compilation fails due to an error on line 1.

E)

F)

The compilation fails due to an error on line 3.

Options:

A.

Option A

B.

Option B

C.

Option C

D.

Option D

E.

Option E

F.

Option F

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Questions 16

Examine these module declarations:

Which two statements are correct? (Choose two.)

Options:

A.

The ServiceProvider module is the only module that, at run time, can provide the com.example.api API.

B.

The placement of the com.example.api API in a separate module, ServiceAPI, makes it easy to install multiple provider modules.

C.

The Consumer module should require the ServiceProvider module.

D.

The ServiceProvider module should export the com.myimpl package.

E.

The ServiceProvider module does not know the identity of a module (such as Consumer) that uses the

com.example.api API.

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Questions 17

Given:

Which loop incurs a compile time error?

Options:

A.

the loop starting line 11

B.

the loop starting line 7

C.

the loop starting line 14

D.

the loop starting line 3

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Questions 18

Given:

and

checkQuality(QUALITY.A);

and

Which code fragment can be inserted into the switch statement to print Best?

Options:

A.

QUALITY.A.ValueOf()

B.

A

C.

A.toString()

D.

QUALITY.A

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Questions 19

Given:

and

Which two method definitions at line n1 in the Bar class compile? (Choose two.)

Options:

A.

public List foo(Set m) {...}

B.

public List foo(Set m) {...}

C.

public List foo(TreeSet m) {...}

D.

public List foo(Set m) {...}

E.

public ArrayList foo(Set m) {...}

F.

public ArrayList foo(Set m) {...}

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Questions 20

Given:

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

Options:

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 1 to public class Student {.

D.

Change line 3 to Student student = new Student(“Biology”);.

E.

Change line 1 to static class Student {.

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Questions 21

Given the code fragment:

What is the result?

Options:

A.

EUR -> 0.84

GBP -> 0.75

USD -> 1.00

CNY -> 6.42

B.

The compilation fails.

C.

CNY -> 6.42

EUR -> 0.84

GBP -> 0.75

USD -> 1.00

D.

USD -> 1.00

GBP -> 0.75

EUR -> 0.84

CNY -> 6.42

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Questions 22

You replace the code on line 1 to use ParallelStream.

Which one is correct?

Options:

A.

The code will produce the same result.

B.

The compilation fails.

C.

A NoSuchElementException is thrown at run time.

D.

The code may produce a different result.

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Questions 23

Given:

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

Options:

A.

Abacus aba = (int m, int n) -> { m * n };

B.

Abacus aba = (int e, int f) -> { return e * f; };

C.

Abacus aba = (a, b) -> a * b;

D.

Abacus aba = v, w -> x * y;

E.

Abacus aba = (int i, j) -> ( return i * j; };

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Questions 24

Given an application with a main module that has this module-info.java file:

Which two are true? (Choose two.)

Options:

A.

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

B.

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

C.

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

D.

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.

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.

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Questions 25

Given the declaration:

Examine this code fragment:

/* Loc1 */ class ProcessOrders { ... }

Which two annotations may be applied at Loc1 in the code fragment? (Choose two.)

Options:

A.

@Resource(priority=100)

B.

@Resource(priority=0)

C.

@Resource(name=“Customer1”, priority=100)

D.

@Resource(name=“Customer1”)

E.

@Resource

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Questions 26

Given the code fragment:

What is the result?

Options:

A.

23

B.

12

C.

123

D.

13

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Questions 27

Given the code fragment:

You want to display the value of currency as $100.00.

Which code inserted on line 1 will accomplish this?

Options:

A.

NumberFormat formatter = NumberFormat.getInstance(locale).getCurrency();

B.

NumberFormat formatter = NumberFormat.getCurrency(locale);

C.

NumberFormat formatter = NumberFormat.getInstance(locale);

D.

NumberFormat formatter = NumberFormat.getCurrencyInstance(locale);

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Questions 28

Given the code fragment:

What is the result?

Options:

A.

13 5 7 9

B.

1 3 5 7 9 11

C.

2 4 6 B 10

D.

2 4 6 8

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Questions 29

A company has an existing Java app that includes two Java 8 jar files, sales-3.10. jar and clients-10.2.jar.

The jar file ,sales -8, 10, jar reference packages in clients -10.2 jar, but clients-10.2 jar does not reference packages in sales -8.10, jar.

They have decided to modularize clients-10.2.jar.

Which module-info. Java file would work for the new library version clients-10.3 jar?

A)

B)

C)

D)

Options:

A.

Option A

B.

Option B

C.

Option C

D.

Option D

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Questions 30

Assume ds is a DataSource and the EMP table is defined appropriately.

What does executing this code fragment do?

Options:

A.

inserts two rows (101, 'SMITH', 'HR') and (102, 'JONES', NULL)

B.

inserts two rows (101, 'SMITH', 'HR') and (102, 'JONES', 'HR')

C.

inserts one row (101, 'SMITH', 'HR')

D.

throws a SQLException

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Questions 31

Given:

Which two interfaces can be used in lambda expressions? (Choose two.)

Options:

A.

MyInterface1

B.

MyInterface3

C.

MyInterface5

D.

MyInterface2

E.

MyInterface4

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Questions 32

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.)

Options:

A.

Replace line 5 with widgetStream.filter(a −> ((Widget)a).getPrice() > 20.00).

B.

Replace line 1 with List widgetStream = widgets.stream();.

C.

Replace line 5 with widgetStream.filter((Widget a) −> a.getPrice() > 20.00).

D.

Replace line 4 with Stream widgetStream = widgets.stream();.

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Questions 33

Given:

Which two statements are true if the method is added to Bar? (Choose two.)

Options:

A.

public Collection foo(Collection arg) { ... } overrides Foo.foo.

B.

public Collection foo(Stream arg) { ... } overloads Foo.foo.

C.

public List foo(Collection arg) { ... } overrides Foo.foo.

D.

public Collection foo(Collection arg) { ... } overloads Foo.foo.

E.

public Collection bar(Collection arg) { ... } overloads Foo.foo.

F.

public Iterable foo(Collection arg) { ... } overrides Foo.foo.

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Questions 34

Given the code fragment:

Which “for” loop produces the same output?

Options:

A.

Option A

B.

Option B

C.

Option C

D.

Option D

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Questions 35

Given:

What is the result?

Options:

A.

The compilation fails.

B.

1.99,2.99,0

C.

1.99,2.99,0.0

D.

1.99,2.99

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Questions 36

Which command line runs the main class com.acme.Main from the module com.example?

Options:

A.

java --module-path mods com.example/com.acme.Main

B.

java –classpath com.example.jar com.acme.Main

C.

java --module-path mods -m com.example/com.acme.Main

D.

java -classpath com.example.jar –m com.example/com.acme.Main

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Questions 37

Given the code fragment:

Which code fragment replaces the for statement?

Options:

A.

IntStream.rangeClosed(l, 100).map(FizzBuzz::convert).forEach(System.out::println);

B.

IntStream.ranged, 100).map(FizzBuzz::convert).forEach(System.out::println);

C.

intstream.rangeclosed(l, 100).mapToObj{FizzBuzz::convert).forEach(System.out::printIn);

D.

IntStream.range(1, 100).mapToObj(FizzBuzz::convert).forEach(System.out::println);

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Questions 38

Given:

What is the result?

Options:

A.

null

B.

nothing

C.

It fails to compile.

D.

java.lang.IllegalAccessException is thrown.

E.

Student

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Questions 39

Given the code fragment:

Which two statement inserted independently at line 1 enable this code to print PRRT?

Options:

A.

i—;

B.

continue b;

C.

break b;

D.

j--;

E.

continue a;

F.

break a ;

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Questions 40

Given this enum declaration:

Examine this code:

System.out.println(Letter.values()[1]);

What code should be written at line 5 for this code to print 200?

Options:

A.

public String toString() { return String.valueOf(ALPHA.v); }

B.

public String toString() { return String.valueOf(Letter.values()[1]); }

C.

public String toString() { return String.valueOf(v); }

D.

String toString() { return “200”; }

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Questions 41

Which two statements are correct about modules in Java? (Choose two.)

Options:

A.

java.base exports all of the Java platforms core packages.

B.

module-info.java can be placed in any folder inside module-path.

C.

A module must be declared in module-info.java file.

D.

module-info.java cannot be empty.

E.

By default, modules can access each other as long as they run in the same folder.

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Questions 42

Given the contents:

MessageBundle.properties file:

message=Hello

MessageBundle_en.properties file:

message=Hello (en)

MessageBundle_US.properties file:

message=Hello (US)

MessageBundle_en_US.properties file:

message=Hello (en_US)

MessageBundle_fr_FR.properties file:

message=Bonjour

and the code fragment:

Locale.setDefault(Locale.FRANCE);

Locale currentLocale = new Locale.Builder().setLanguage(“en”).build();

ResourceBundle messages = ResourceBundle.getBundle(“MessageBundle”, currentLocale);

System.out. println(messages.getString(“message”));

Which file will display the content on executing the code fragment?

Options:

A.

MessageBundle_en_US.properties

B.

MessageBundle_en.properties

C.

MessageBundle_fr_FR.properties

D.

MessageBundle_US.properties

E.

MessageBundle.properties

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Questions 43

Given:

and the code fragment:

Which two Map objects group all employees with a salary greater than 30 by neighborhood? (Choose two.)

A)

B)

C)

D)

E)

Options:

A.

Option

B.

Option

C.

Option

D.

Option

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Questions 44

Given:

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

Options:

A.

line 12

B.

line 6

C.

line 9

D.

line 8

E.

line 7

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Questions 45

Which code fragment added to line 1 enables the code to compile and print Hello Joe?

A)

B)

C)

D)

Options:

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Questions 46

Given:

Which statement is true about the Fox class?

Options:

A.

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

B.

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

C.

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

D.

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

E.

Fox class must provide implementation for the inhabit method.

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Questions 47

Given:

What is the output?

Options:

A.

A compilation error is thrown.

B.

Message from Copier: Attempt00

C.

Message from Abstract Copier: Attempt00

D.

A runtime error is thrown.

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Questions 48

Which three initialization statements are correct? (Choose three.)

Options:

A.

int[][][] e = {{1,1,1},{2,2,2}};

B.

short sh = (short)’A’;

C.

float x = 1f;

D.

byte b = 10;

char c = b;

E.

String contact# = “(+2) (999) (232)”;

F.

int x = 12_34;

G.

boolean false = (4 != 4);

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Questions 49

Given the code fragment:

How many lines of text does this program print?

Options:

A.

four

B.

one

C.

three

D.

two

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Questions 50

Given the code fragment:

What is the result?

Options:

A.

01

B.

0

C.

1

D.

The program prints nothing.

E.

It prints 1 in the infinite loop.

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Questions 51

Given the formula to calculate a monthly mortgage payment:

and these declarations:

How can you code the formula?

Options:

A.

m = p * (r * Math.pow(1 + r, n) / (Math.pow(1 + r, n) - 1));

B.

m = p * ((r * Math.pow(1 + r, n) / (Math.pow(1 + r, n)) - 1));

C.

m = p * r * Math.pow(1 + r, n) / Math.pow(1 + r, n) - 1;

D.

m = p * (r * Math.pow(1 + r, n) / Math.pow(1 + r, n) - 1);

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Questions 52

Which two statements set the default locale used for formatting numbers, currency, and percentages? (Choose two.)

Options:

A.

Locale.setDefault(Locale.Category.FORMAT, “zh-CN”);

B.

Locale.setDefault(Locale.Category.FORMAT, Locale.CANADA_FRENCH);

C.

Locale.setDefault(Locale.SIMPLIFIED_CHINESE);

D.

Locale.setDefault(“en_CA”);

E.

Locale.setDefault(“es”, Locale.US);

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Questions 53

Which two are functional interfaces? (Choose two.)

Options:

A.

Option A

B.

Option B

C.

Option C

D.

Option D

E.

Option E

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Questions 54

Given:

Which two methods modify field values? (Choose two.)

Options:

A.

setAllCounts

B.

setACount

C.

setGCount

D.

setCCount

E.

setTCount

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Questions 55

Given:

Which three classes successfully override printOne()? (Choose three.)

Options:

A.

Option A

B.

Option B

C.

Option C

D.

Option D

E.

Option E

F.

Option F

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Questions 56

Given:

Which three actions implement Java SE security guidelines? (Choose three.)

Options:

A.

Change line 7 to return names.clone();.

B.

Change line 4 to this.names = names.clone();.

C.

Change the getNames() method name to get$Names().

D.

Change line 6 to public synchronized String[] getNames() {.

E.

Change line 2 to private final String[] names;.

F.

Change line 3 to private Secret(String[] names) {.

G.

Change line 2 to protected volatile String[] names;.

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Questions 57

Your organization provides a cloud server to your customer to run their Java code. You are reviewing the changes for the next release and you see this change in one of the config files:

Which is correct?

Options:

A.

You accept the change because -noverify is necessary for your code to run with the latest version of Java.

B.

You reject the change because -Xms8g -Xmx8g uses too much system memory.

C.

You accept the change because -noverify is a standard option that has been supported since Java 1.0.

D.

You reject the change because -noverify is a critical security risk.

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Questions 58

Given:

Which would cause s to be AQCD?

Options:

A.

s.replace(s.indexOf(“A”), s.indexOf(“C”), “Q”);

B.

s.replace(s.indexOf(“B”), s.indexOf(“C”), “Q”);

C.

s.replace(s.indexOf(“B”), s.indexOf(“B”), “Q”);

D.

s.replace(s.indexOf(“A”), s.indexOf(“B”), “Q”);

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Questions 59

Given:

public class X {

}

and

public final class Y extends X {

}

What is the result of compiling these two classes?

Options:

A.

The compilation fails because there is no zero args constructor defined in class X.

B.

The compilation fails because either class X or class Y needs to implement the toString() method.

C.

The compilation fails because a final class cannot extend another class.

D.

The compilation succeeds.

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Questions 60

Given the code fragment:

Which two code snippets inserted independently inside println method print Mondial:domainmodel? (Choose two.)

Options:

A.

Main.prefix + Main.name

B.

prefix + getName

C.

Main.prefix + Main.getName()

D.

new Main().prefix + new Main().name

E.

prefix + name

F.

prefix + Main.name

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Questions 61

Which interface in the java.util.function package will return a void return type?

Options:

A.

Supplier

B.

Predicate

C.

Function

D.

Consumer

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Questions 62

Which is a proper JDBC URL?

Options:

A.

jdbe.mysql.com://localhost:3306/database

C.

http://localhost mysql.jdbc:3306/database

D.

jdbc:mysql://localhost:3306/database

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Questions 63

Given:

You want to obtain the Stream object on reading the file. Which code inserted on line 1 will accomplish this?

Options:

A.

var lines = Files.lines(Paths.get(INPUT_FILE_NAME));

B.

Stream lines = Files.readAllLines(Paths.get(INPUT_FILE_NAME));

C.

var lines = Files.readAllLines(Paths.get(INPUT_FILE_NAME));

D.

Stream lines = Files.lines(INPUT_FILE_NAME);

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Questions 64

Given:

Which statement is equivalent to line 1?

Options:

A.

double totalSalary = list.stream().map(e −> e.getSalary() * ratio).reduce (bo).ifPresent (p −> p.doubleValue());

B.

double totalSalary = list.stream().mapToDouble(e −> e.getSalary() * ratio).sum;

C.

double totalSalary = list.stream().map(Employee::getSalary * ratio).reduce (bo).orElse(0.0);

D.

double totalSalary = list.stream().mapToDouble(e −> e.getSalary() * ratio).reduce(starts, bo);

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Questions 65

Given:

What is the result?

Options:

A.

Map: 0 Keys: 0 Values: 0

B.

The compilation fails.

C.

Map: 4 Keys: 4 Values: 4

D.

Map: 4 Keys: 0 Values: 0

E.

Map: 0 Keys: 4 Values: 4

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Questions 66

Given the code fragment:

What is the result?

Options:

A.

2

B.

-1

C.

1

D.

-3

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Questions 67

Given:

var fruits = List.of(“apple”, “orange”, “banana”, “lemon”);

You want to examine the first element that contains the character n. Which statement will accomplish this?

Options:

A.

String result = fruits.stream().filter(f −> f.contains(“n”)).findAny();

B.

fruits.stream().filter(f −> f.contains(“n”)).forEachOrdered(System.out::print);

C.

Optional result = fruits.stream().filter(f −> f.contains (“n”)).findFirst ();

D.

Optional result = fruits.stream().anyMatch(f −> f.contains(“n”));

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Questions 68

Which two modules include APIs in the Java SE Specification? (Choose two.)

Options:

A.

java.logging

B.

java.desktop

C.

javafx

D.

jdk.httpserver

E.

jdk.jartool

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Questions 69

Given:

What is the result?

Options:

A.

Orange Juice

B.

The compilation fails.

C.

Orange Juice Apple Pie Lemmon Ice Raspberry Tart

D.

The program prints nothing.

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Questions 70

Given:

List list1 = new ArrayList<>();

list1.add(“A”);

list1.add(“B”);

List list2 = List.copyOf(list1);

list2.add(“C”);

List> list3 = List.of(list1, list2);

System.out.println(list3);

What is the result?

Options:

A.

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

B.

An exception is thrown at run time.

C.

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

D.

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

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Questions 71

Given the code fragment:

What is the result?

Options:

A.

-1 : 2

B.

2 : -1

C.

2 : 3

D.

3 : 0

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Questions 72

Given:

What is the result?

Options:

A.

An indexOutofBoundsException is thrown at runtime.

B.

At once 0

C.

Hat at store 4

D.

At once 1

E.

Hat at store 1

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Questions 73

Given:

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

Options:

A.

Function function = String::toUpperCase;

B.

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

C.

UnaryOperator function = String::toUpperCase;

D.

Function function = m −> m.toUpperCase();

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Questions 74

Given:

Which is true?

Options:

A.

The compilation fails due to an error in line 6.

B.

The compilation succeeds.

C.

The compilation fails due to an error in line 4.

D.

The compilation fails due to an error in line 10.

E.

The compilation fails due to an error in line 7.

F.

The compilation fails due to an error in line 9.

G.

The compilation fails due to an error in line 2.

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Questions 75

Which two are successful examples of autoboxing? (Choose two.)

Options:

A.

String a = “A”;

B.

Integer e = 5;

C.

Float g = Float.valueOf(null);

D.

Double d = 4;

E.

Long c = 23L;

F.

Float f = 6.0;

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Questions 76

Given:

and

What is the result?

Options:

A.

A NullPointerException is thrown at run time.

B.

The compilation fails.

C.

1

Null

null

D.

1

1

1

E.

A ClassCastException is thrown at run time.

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Questions 77

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?

Options:

A.

“eeee dd+”th of”+ MMM yyyy”

B.

“eeee dd'th of' MMM yyyy”

C.

“eeee d+”th of”+ MMMM yyyy”

D.

“eeee d’th of’ MMMM yyyy”

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Exam Code: 1z0-819
Exam Name: Java SE 11 Developer
Last Update: Sep 14, 2024
Questions: 296
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