Is this exam completely free?

ExamCademy offers a free preview for every exam, covering around 20% of the total questions. Full access to all questions is available for free by signing up for an account. Optional supporters unlock AstroTutor (AI tutor) and advanced study modes.

Can I practice IT certification exams from Microsoft, AWS, or CompTIA?

Yes! ExamCademy supports a wide range of IT certification exams including Microsoft Azure, AWS Cloud Practitioner, and CompTIA A+ and Security+.

How accurate are the mock exams?

Our practice questions are community-created and moderator-reviewed to align with realistic exam objectives, style, and difficulty.

1z0-819 by Oracle - Page 1 | ExamCademy

Mode Selection

Question 1

Question 2

Question 3

Given TripleThis.java:

Question 4

Given the code fragment:

Question 5

Given the code fragment:

Question 6

Given the code fragment:

Question 7

Given:

Automobile.java -

Question 8

Which module is required for any application using Swing or AWT?

A java.desktop
B java.prefs
C java.se
D java.logging
E java.rmi

Question 9

Which set of commands is necessary to create and run a custom runtime image from Java source files?

A java,jdeps
B javac,jlink
C javac,jar
D jar,jlink

Question 10

Given the code fragment:

Question 11

Given:

Question 12

Given:

Question 13

Which module-info.java is correct for a service provider for a print service defined in the PrintServiceAPI module?

A module PrintServiceProvider { requires PrintServiceAPI; exports org.printservice.spi; }
B module PrintServiceProvider { requires PrintServiceAPI; provides org.printservice.spi.Print with com.provider.PrintService; }
C module PrintServiceProvider { requires PrintServiceAPI; uses com.provider.PrintService; }
D module PrintServiceProvider { requires PrintServiceAPI; exports org.printservice.spi.Print with com.provider.PrintService; }

Question 14

Given:

Question 15

Given:

Question 16

Given:

Question 17

Given:

Question 18

Given the code fragment:

Question 19

Given the content from the course.txt file:

Question 20

Given:

Question 21

Given:

Question 22

Given:

Question 23

Given these declarations:

Question 24

Given the code fragment:

Question 25

Given:

Page 1 of 9 • Questions 1-25 of 213

1 2 3 4 5

→

Know a question that should be here? Contribute to this exam

Given:

What is the result?

A 2-4
B 0-6 1-5 2-4
C 1-5
D 1-5 2-4
E The compilation fails due to an error in line 1.
F 0-6
G 0-6 2-4

Given:

What is the result?

A [A, B, C] followed by an exception thrown on line 11.
B [A, B, C] [A, B]
C [A, B, C] [A, B, C]
D On line 9, an exception is thrown at run time.

Compiling TripleThis.java gives this compiler warning:

Note: TripleThis.java uses unchecked or unsafe operations.

Which two replacements remove this compiler warning and prints 12? (Choose two.)

A Replace line 12 with public static void printValue(Function f, int num) {
B Replace line 12 with public static void printValue(Function f, T num) {
C Replace line 9 with Function tripler = x —> { return (Integer) x * 3; }
D Replace line 12 with public static void printValue(Function f, Integer num) {
E Replace line 9 with Function tripler = x -> { return x * 3; }
F Replace line 9 with Function tripler = x -> [ return x * 3; ]

What change on line 1 will make this code compile?

A Add catch(M | L e)
B Add catch(L e)
C Add catch(N | L | M e)
D Add catch(L | N e)
E Add catch(L | M | N e)

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

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

What is the result?

A [Lettuce, Kale]
B A compilation error is thrown.
C [Lettuce, Kale] [Seabass, Salmon]
D [Kale, Lettuce] [Salmon, Seabass]

Car.java -

What must you do so that the code prints 4?

A Remove the parameter from wheels method in line 3.
B Remove abstract keyword in line 1.
C Replace the code in line 2 with Car ob = new Car();.
D Add @Override annotation at line 2.

Which would cause s to be AQCD?

A s.replace(s.indexOf("B"), s.indexOf("B"), "Q");
B s.replace(s.indexOf("A"), s.indexOf("B"), "Q");
C s.replace(s.indexOf("B"), s.indexOf("C"), "Q");
D s.replace(s.indexOf("A"), s.indexOf("C"), "Q");

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

A getCCount
B getTCount
C getACount
D getGCount
E getTotalCount

To secure this code, you want to make sure that the client code cannot modify the public static fields.

Which code will accomplish this?

A
B
C
D

and

What is the result?

A test:null
B test:1
C A ClassCastException is thrown at runtime.
D null:null
E The compilation fails.

Given the directory structure:

Given the commands to execute at the Test directory prompt:

Which statement is true?

A Create an empty module-info.java file in the Test directory and on execution of the given commands, the program prints:
B On execution of the given commands, the program prints:
C Execute java --module-path pac pac.Hello instead of java -cp pac pac.Hello and on execution the program prints:
D On execution of the given commands, the program prints:

and

What is the result?

A 214
B 2341
C 234
D 2134

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

A
B
C
D

Which statement at line 1 will print Ping Pong?

A
B
C
D

Given the code fragment:

Which code fragment at line 1 prints the lines that contain Java from the course.txt file?

A
B
C
D
E

What is the output?

A A NullPointerException is thrown at run time.
B null
C Duke
D A NoSuchElementException is thrown at run time.

and

Which code fragment on line 1 makes the m map contain the employee with the highest salary for each neighborhood?

A
B
C
D

Taking into account that the order of the elements is unpredictable, what is the output?

A {am=2, first=1, mismatch=1, second=2}
B {mismatch=2, am=2, first=1, second=1}
C {l=mismatch, 2=am}
D {mismatch=1, am=2, first=1, second=1}

and these two code fragments:

Fragment 1:

Fragment 2:

Which code fragment is preferred and why?

A Fragment 1 because it is shorter.
B Fragment 2 because it prevents SQL injection.
C Fragment 2 because it explicitly specifies the SQL types of the column values.
D Fragment 1 because it is more performant.

What is the result?

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

How many LocalDate objects are created in this example?

A 2
B 3
C 4
D 5

1z0-819Preview

Mode Selection

Question 1

Question 2

Question 3

Question 4

Question 5

Question 6

Question 7

Question 8

Question 9

Question 10

Question 11

Question 12

Question 13

Question 14

Question 15

Question 16

Question 17

Question 18

Question 19

Question 20

Question 21

Question 22

Question 23

Question 24

Question 25