Passing exam with 1z0-830 latest training materials
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Last Updated: Oct 13, 2026
No. of Questions: 85 Questions & Answers with Testing Engine
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Oracle 1z0-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Object-Oriented Programming | - Core OOP principles
|
| Topic 2: Input/Output and File Handling | - NIO and file operations
|
| Topic 3: Java Language Fundamentals | - Java syntax and language structure
|
| Topic 4: Core APIs | - Java standard library usage
|
| Topic 5: Exception Handling and Debugging | - Error handling mechanisms
|
| Topic 6: Concurrency and Multithreading | - Thread management
|
| Topic 7: Database Connectivity (JDBC) | - Database interaction
|
| Topic 8: Advanced Java Features (Java SE 21) | - Modern language features
|
Oracle Java SE 21 Developer Professional Sample Questions:
Given:
java
Optional<String> optionalName = Optional.ofNullable(null);
String bread = optionalName.orElse("Baguette");
System.out.print("bread:" + bread);
String dish = optionalName.orElseGet(() -> "Frog legs");
System.out.print(", dish:" + dish);
try {
String cheese = optionalName.orElseThrow(() -> new Exception());
System.out.println(", cheese:" + cheese);
} catch (Exception exc) {
System.out.println(", no cheese.");
}
What is printed?
- A. bread:Baguette, dish:Frog legs, cheese.
- B. Compilation fails.
- C. bread:Baguette, dish:Frog legs, no cheese.
- D. bread:bread, dish:dish, cheese.
Correct Answer: C 🗳️
Explanation: Only visible for TrainingQuiz members. You can sign-up / login (it's free).
Given:
java
public class BoomBoom implements AutoCloseable {
public static void main(String[] args) {
try (BoomBoom boomBoom = new BoomBoom()) {
System.out.print("bim ");
throw new Exception();
} catch (Exception e) {
System.out.print("boom ");
}
}
@Override
public void close() throws Exception {
System.out.print("bam ");
throw new RuntimeException();
}
}
What is printed?
- A. Compilation fails.
- B. bim bam followed by an exception
- C. bim bam boom
- D. bim boom
- E. bim boom bam
Correct Answer: C 🗳️
Explanation: Only visible for TrainingQuiz members. You can sign-up / login (it's free).
Given:
java
Map<String, Integer> map = Map.of("b", 1, "a", 3, "c", 2);
TreeMap<String, Integer> treeMap = new TreeMap<>(map);
System.out.println(treeMap);
What is the output of the given code fragment?
- A. {b=1, c=2, a=3}
- B. {c=1, b=2, a=3}
- C. {a=1, b=2, c=3}
- D. {b=1, a=3, c=2}
- E. {a=3, b=1, c=2}
- F. {c=2, a=3, b=1}
- G. Compilation fails
Correct Answer: E 🗳️
Explanation: Only visible for TrainingQuiz members. You can sign-up / login (it's free).
Given:
java
CopyOnWriteArrayList<String> list = new CopyOnWriteArrayList<>();
list.add("A");
list.add("B");
list.add("C");
// Writing in one thread
new Thread(() -> {
list.add("D");
System.out.println("Element added: D");
}).start();
// Reading in another thread
new Thread(() -> {
for (String element : list) {
System.out.println("Read element: " + element);
}
}).start();
What is printed?
- A. It prints all elements, including changes made during iteration.
- B. Compilation fails.
- C. It throws an exception.
- D. It prints all elements, but changes made during iteration may not be visible.
Correct Answer: D 🗳️
Explanation: Only visible for TrainingQuiz members. You can sign-up / login (it's free).
Given a properties file on the classpath named Person.properties with the content:
ini
name=James
And:
java
public class Person extends ListResourceBundle {
protected Object[][] getContents() {
return new Object[][]{
{"name", "Jeanne"}
};
}
}
And:
java
public class Test {
public static void main(String[] args) {
ResourceBundle bundle = ResourceBundle.getBundle("Person");
String name = bundle.getString("name");
System.out.println(name);
}
}
What is the given program's output?
- A. JamesJeanne
- B. James
- C. MissingResourceException
- D. JeanneJames
- E. Jeanne
- F. Compilation fails
Correct Answer: E 🗳️
Explanation: Only visible for TrainingQuiz members. You can sign-up / login (it's free).
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