Oracle Java SE 11 Developer - 1Z0-819 Exam Questions [2026]

QUESTION NO: 1
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.

Correct Answer: C

QUESTION NO: 2
Given:

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

A. MyInterface2 B. MyInterface5 C. MyInterface3 D. MyInterface1 E. MyInterface4

Correct Answer: A,B

QUESTION NO: 3
Consider this method declaration:

A) "SET SESSION AUTHORIZATION " + user
B) "SET SESSION AUTHORIZATION " + stmt.enquoteIdentifier(user)
Is A or B the correct replacement for <EXPRESSION> and why?

A. B, because enquoting values provided by the calling code prevents SQL injection. B. A and B are functionally equivalent. C. A, because it sends exactly the value of user provided by the calling code. D. A, because it is unnecessary to enclose identifiers in quotes. E. B, because all values provided by the calling code should be enquoted.

Correct Answer: C

QUESTION NO: 4
Given:

What is the result?

A. 5 5 3 3 B. 3 5 3 3 C. 3 3 3 3 D. 3 5 3 5

Correct Answer: B

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QUESTION NO: 5
Given:

What is the result?

A. 3241 B. 214 C. 234 D. 2134

Correct Answer: A

QUESTION NO: 6
Given:

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

A. Change line 2 to protected volatile String[] names;. B. Change the getNames() method name to get$Names(). C. Change line 2 to private final String[] names;. D. Change line 7 to return names.clone();. E. Change line 3 to private Secret(String[] names) {. F. Change line 6 to public synchronized String[] getNames() {. G. Change line 4 to this.names = names.clone();.

Correct Answer: A,C,E

QUESTION NO: 7
Given:

What is the result?

A. compilation error B. 0 5 C. 5 12 D. 6 13

Correct Answer: A

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QUESTION NO: 8
Given:

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

A. public void x() { }
public void z() { } B. void x() { }
public void y() { }
public void z() { } C. public void x() { }
protected void y() { super.y(); }
public void z() { } D. void x() { super.y(); }
public void z() { } E. void x() { }
public void z() { }

Correct Answer: A

QUESTION NO: 9
Given the code fragment:

What change on line 1 will make this code compile?

Correct Answer: E