Instant Download Oracle : 1z1-830 Questions & Answers as PDF & Test Engine
Updated: Oct 02, 2026
No. of Questions: 85 Questions & Answers with Testing Engine
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Oracle 1z1-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Java Language Fundamentals | - Java syntax and language structure
|
| Advanced Java Features (Java SE 21) | - Modern language features
|
| Concurrency and Multithreading | - Thread management
|
| Core APIs | - Java standard library usage
|
| Input/Output and File Handling | - NIO and file operations
|
| Object-Oriented Programming | - Core OOP principles
|
| Database Connectivity (JDBC) | - Database interaction
|
| Exception Handling and Debugging | - Error handling mechanisms
|
Oracle Java SE 21 Developer Professional Sample Questions:
Given:
java
StringBuilder result = Stream.of("a", "b")
.collect(
() -> new StringBuilder("c"),
StringBuilder::append,
(a, b) -> b.append(a)
);
System.out.println(result);
What is the output of the given code fragment?
- A. bca
- B. abc
- C. cacb
- D. acb
- E. cba
- F. cbca
- G. bac
Correct Answer: E 🗳️
Explanation: Only visible for NewPassLeader members. You can sign-up / login (it's free).
Given:
java
public class OuterClass {
String outerField = "Outer field";
class InnerClass {
void accessMembers() {
System.out.println(outerField);
}
}
public static void main(String[] args) {
System.out.println("Inner class:");
System.out.println("------------");
OuterClass outerObject = new OuterClass();
InnerClass innerObject = new InnerClass(); // n1
innerObject.accessMembers(); // n2
}
}
What is printed?
- A. markdown
Inner class:
------------
Outer field - B. Nothing
- C. Compilation fails at line n1.
- D. An exception is thrown at runtime.
- E. Compilation fails at line n2.
Correct Answer: C 🗳️
Explanation: Only visible for NewPassLeader members. You can sign-up / login (it's free).
Given:
java
public class SpecialAddition extends Addition implements Special {
public static void main(String[] args) {
System.out.println(new SpecialAddition().add());
}
int add() {
return --foo + bar--;
}
}
class Addition {
int foo = 1;
}
interface Special {
int bar = 1;
}
What is printed?
- A. 1
- B. 0
- C. 2
- D. It throws an exception at runtime.
- E. Compilation fails.
Correct Answer: E 🗳️
Explanation: Only visible for NewPassLeader members. You can sign-up / login (it's free).
Given:
java
Period p = Period.between(
LocalDate.of(2023, Month.MAY, 4),
LocalDate.of(2024, Month.MAY, 4));
System.out.println(p);
Duration d = Duration.between(
LocalDate.of(2023, Month.MAY, 4),
LocalDate.of(2024, Month.MAY, 4));
System.out.println(d);
What is the output?
- A. P1Y
PT8784H - B. PT8784H
P1Y - C. P1Y
UnsupportedTemporalTypeException - D. UnsupportedTemporalTypeException
Correct Answer: C 🗳️
Explanation: Only visible for NewPassLeader members. You can sign-up / login (it's free).
Which two of the following aren't the correct ways to create a Stream?
- A. Stream stream = Stream.empty();
- B. Stream stream = new Stream();
- C. Stream stream = Stream.ofNullable("a");
- D. Stream stream = Stream.of();
- E. Stream<String> stream = Stream.builder().add("a").build();
- F. Stream stream = Stream.generate(() -> "a");
Correct Answer: B,E 🗳️
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