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Oracle 1z0-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Java Language Fundamentals | - Java syntax and language structure
|
| Database Connectivity (JDBC) | - Database interaction
|
| Core APIs | - Java standard library usage
|
| Object-Oriented Programming | - Core OOP principles
|
| Input/Output and File Handling | - NIO and file operations
|
| Advanced Java Features (Java SE 21) | - Modern language features
|
| Concurrency and Multithreading | - Thread management
|
| Exception Handling and Debugging | - Error handling mechanisms
|
Oracle Java SE 21 Developer Professional Sample Questions:
Given:
java
interface A {
default void ma() {
}
}
interface B extends A {
static void mb() {
}
}
interface C extends B {
void ma();
void mc();
}
interface D extends C {
void md();
}
interface E extends D {
default void ma() {
}
default void mb() {
}
default void mc() {
}
}
Which interface can be the target of a lambda expression?
- A. E
- B. None of the above
- C. D
- D. C
- E. A
- F. B
Explanation: Only visible for ExamTorrent members. You can sign-up / login (it's free).
Given:
java
Stream<String> strings = Stream.of("United", "States");
BinaryOperator<String> operator = (s1, s2) -> s1.concat(s2.toUpperCase()); String result = strings.reduce("-", operator); System.out.println(result); What is the output of this code fragment?
- A. -UnitedSTATES
- B. UnitedStates
- C. United-STATES
- D. -UnitedStates
- E. United-States
- F. -UNITEDSTATES
- G. UNITED-STATES
Explanation: Only visible for ExamTorrent members. You can sign-up / login (it's free).
What do the following print?
java
import java.time.Duration;
public class DividedDuration {
public static void main(String[] args) {
var day = Duration.ofDays(2);
System.out.print(day.dividedBy(8));
}
}
- A. PT6H
- B. It throws an exception
- C. PT0D
- D. PT0H
- E. Compilation fails
Explanation: Only visible for ExamTorrent members. You can sign-up / login (it's free).
Given:
java
DoubleSummaryStatistics stats1 = new DoubleSummaryStatistics();
stats1.accept(4.5);
stats1.accept(6.0);
DoubleSummaryStatistics stats2 = new DoubleSummaryStatistics();
stats2.accept(3.0);
stats2.accept(8.5);
stats1.combine(stats2);
System.out.println("Sum: " + stats1.getSum() + ", Max: " + stats1.getMax() + ", Avg: " + stats1.getAverage()); What is printed?
- A. Sum: 22.0, Max: 8.5, Avg: 5.5
- B. Compilation fails.
- C. An exception is thrown at runtime.
- D. Sum: 22.0, Max: 8.5, Avg: 5.0
Explanation: Only visible for ExamTorrent members. You can sign-up / login (it's free).
Given:
java
var hauteCouture = new String[]{ "Chanel", "Dior", "Louis Vuitton" };
var i = 0;
do {
System.out.print(hauteCouture[i] + " ");
} while (i++ > 0);
What is printed?
- A. Compilation fails.
- B. Chanel Dior Louis Vuitton
- C. An ArrayIndexOutOfBoundsException is thrown at runtime.
- D. Chanel
Explanation: Only visible for ExamTorrent members. You can sign-up / login (it's free).
Maggie 
Mortimer 
King 
Primo 
Phoebe 
Harry 
Muriel 
Kitty 
Blanche 
Myron 
Anna 
Norma 
Nelson 
Will 
Tracy 
Lambert 
Lillian 
Carey 
Cornelius 
Ophelia 
