Oracle 1Z0-819 Actual Free Exam Questions & Community Discussion

Exam Code/Number: 1Z0-819
Exam Name/Title: Java SE 11 Developer
Certification Provider: Oracle
Corresponding Certification: Oracle Java SE

Exam Questions: 297
Updated On: Jun 01, 2026

Question #57

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

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

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

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

D. module-info.java cannot be empty.

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

Discussion 0

Correct Answer: A,E Vote an answer

Question #58

Given:
var data = new ArrayList<>();
data.add("Peter");
data.add(30);
data.add("Market Road");
data.set(1, 25);
data.remove(2);
data.set(3, 1000L);
System.out.print(data);
What is the output?

A. [Peter, 30, Market Road]

B. [Market Road, 1000]

C. [Peter, 25, null, 1000]

D. An exception is thrown at run time.

Discussion 0

Correct Answer: D Vote an answer

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Question #59

Given:

It is required that if p instanceof Pair then p.isValid() returns true.
Which is the smallest set of visibility changes to insure this requirement is met?

A. isValid must be public.

B. setLeft and setRight must be protected.

C. left, right, setLeft, and setRight must be private.

D. left and right must be private.

Discussion 0

Correct Answer: D Vote an answer

Question #60

Which two are functional interfaces? (Choose two.)

A. Option B

B. Option D

C. Option C

D. Option E

E. Option A

Discussion 0

Correct Answer: C,D Vote an answer

Question #61

Given:

What is the result?

A. null

B. p1

C. Joe Bloggs

D. The compilation fails due to an error in line 1.

Discussion 0

Correct Answer: D Vote an answer

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Question #62

Your organization makes mlib.jar available to your cloud customers. While working on a code cleanup project for mlib.jar, you see this method by customers:

What security measures should be added to this method so that it meets the requirements for a customer accessible method?

A. Enclose the call to new Socket In an AccessController.doPrivileged block.

B. Make enableService private.

C. Create a method that validates the hostName and portNumber parameters before opening the socket.

Discussion 0

Correct Answer: A Vote an answer

Question #63

Which statement about access modifiers is correct?

A. An inner class cannot be declared with the public modifier.

B. A local variable can be declared with the final modifier.

C. An interface can be declared with the protected modifier.

D. An instance variable can be declared with the static modifier.

E. An abstract method can be declared with the private modifier.

Discussion 0

Correct Answer: B Vote an answer

Question #64

Given:

Which two are secure serialization of these objects? (Choose two.)

A. Define the serialPersistentFields array field.

B. Declare fields transient.

C. Implement only writeReplace to replace the instance with a serial proxy and not readResolve.

D. Implement only readResolve to replace the instance with a serial proxy and not writeReplace.

E. Make the class abstract.

Discussion 0

Correct Answer: A,D Vote an answer

Question #65

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

A. Any named module can directly access all classes in an automatic module.

B. Classes found in -classpath are part of an unnamed module.

C. Modular jars loaded from -classpath are automatic modules.

D. If a package is defined in both the named module and the unnamed module, then the package in the unnamed module is ignored.

E. Modular jars loaded from --module-path are automatic modules.

Discussion 0

Correct Answer: B,E Vote an answer

Question #66

Given:

and

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

A. public List<Integer> foo(Set<CharSequence> m) {...}

B. public ArrayList<Integer> foo(Set<String> m) {...}

C. public ArrayList<Number> foo(Set<CharSequence> m) {...}

D. public List<Object> foo(Set<CharSequence> m) {...}

E. public List<Integer> foo(TreeSet<String> m) {...}

F. public List<Number> foo(Set<String> m) {...}

Discussion 0

Correct Answer: C,E Vote an answer

Question #67

Given:

What is the result?

A. 2134

B. 214

C. 2143

D. 234

Discussion 0

Correct Answer: B Vote an answer

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Question #68

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.

A. Option B

B. Option F

C. Option D

D. Option C

E. Option E

F. Option A

Discussion 0

Correct Answer: F Vote an answer

Question #69

You are working on a functional bug in a tool used by your development organization. In your investigation, you find that the tool is executed with a security policy file containing this grant.

What action should you take?

A. Nothing, because it is not related to the bug you are investigating.

B. Nothing, because listing just the required permissions would be an ongoing maintenance challenge.

C. File a security bug against the tool referencing the excessive permission granted.

D. Nothing, because it is an internal tool and not exposed to the public.

E. Remove the grant because it is excessive.

Discussion 0

Correct Answer: C Vote an answer

Question #70

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

A. javafx

B. java.logging

C. java.desktop

D. jdk.jartool

E. jdk.httpserver

Discussion 0

Correct Answer: B,E Vote an answer

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