Oracle 1z0-830 Questions & Answers - in .pdf
- Total Q&A: 85
- Update: Aug 20, 2026
- Price: $59.99
- Vendor: Oracle
- Exam Code: 1z0-830
- Exam Name: Java SE 21 Developer Professional
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Oracle 1z0-830 Q&A - Testing Engine
- Total Q&A: 85
- Update: Aug 20, 2026
- Price: $59.99
- Vendor: Oracle
- Exam Code: 1z0-830
- Exam Name: Java SE 21 Developer Professional
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Oracle 1z0-830 Exam Syllabus Topics:
| Section | Objectives |
|---|
| Java Language Fundamentals | - Java syntax and language structure
- 1. Data types, variables, and operators
- 2. Control flow statements
|
| Concurrency and Multithreading | - Thread management
- 1. Virtual threads and structured concurrency concepts
- 2. Thread lifecycle and synchronization
|
| Input/Output and File Handling | - NIO and file operations
- 1. Serialization basics
- 2. File, Path, and Streams APIs
|
| Object-Oriented Programming | - Core OOP principles
- 1. Encapsulation, inheritance, polymorphism
- 2. Abstract classes and interfaces
|
| Core APIs | - Java standard library usage
- 1. Collections Framework
- 2. Date and Time API
- 3. Streams and functional programming
|
| Advanced Java Features (Java SE 21) | - Modern language features
- 1. Records and record patterns
- 2. Pattern matching for switch
- 3. Virtual threads (Project Loom)
- 4. Sealed classes
|
| Exception Handling and Debugging | - Error handling mechanisms
- 1. Try-with-resources
- 2. Checked vs unchecked exceptions
|
| Database Connectivity (JDBC) | - Database interaction
- 1. JDBC API usage
- 2. SQL execution and result handling
|
Oracle Java SE 21 Developer Professional Sample Questions:
1. Given:
java
Optional o1 = Optional.empty();
Optional o2 = Optional.of(1);
Optional o3 = Stream.of(o1, o2)
.filter(Optional::isPresent)
.findAny()
.flatMap(o -> o);
System.out.println(o3.orElse(2));
What is the given code fragment's output?
A) Compilation fails
B) Optional[1]
C) 2
D) An exception is thrown
E) Optional.empty
F) 0
G) 1
2. What do the following print?
java
public class DefaultAndStaticMethods {
public static void main(String[] args) {
WithStaticMethod.print();
}
}
interface WithDefaultMethod {
default void print() {
System.out.print("default");
}
}
interface WithStaticMethod extends WithDefaultMethod {
static void print() {
System.out.print("static");
}
}
A) nothing
B) Compilation fails
C) static
D) default
3. Which of the following statements is correct about a final class?
A) It cannot implement any interface.
B) It cannot be extended by any other class.
C) The final keyword in its declaration must go right before the class keyword.
D) It must contain at least a final method.
E) It cannot extend another class.
4. Given:
java
List<String> frenchAuthors = new ArrayList<>();
frenchAuthors.add("Victor Hugo");
frenchAuthors.add("Gustave Flaubert");
Which compiles?
A) Map<String, ? extends List<String>> authorsMap2 = new HashMap<String, ArrayList<String>> (); java authorsMap2.put("FR", frenchAuthors);
B) Map<String, List<String>> authorsMap5 = new HashMap<String, List<String>>(); java authorsMap5.put("FR", frenchAuthors);
C) Map<String, ArrayList<String>> authorsMap1 = new HashMap<>();
java
authorsMap1.put("FR", frenchAuthors);
D) Map<String, List<String>> authorsMap4 = new HashMap<String, ArrayList<String>>(); java authorsMap4.put("FR", frenchAuthors);
E) var authorsMap3 = new HashMap<>();
java
authorsMap3.put("FR", frenchAuthors);
5. Given:
java
public class ThisCalls {
public ThisCalls() {
this(true);
}
public ThisCalls(boolean flag) {
this();
}
}
Which statement is correct?
A) It compiles.
B) It does not compile.
C) It throws an exception at runtime.
Solutions:
Question # 1
Answer: G | Question # 2
Answer: C | Question # 3
Answer: B | Question # 4
Answer: B,D,E | Question # 5
Answer: B |
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