Instant Download Oracle : 1z0-830
Check Updated on: Oct 20, 2026
No. of Questions: 85 Questions & Answers with Exam Engine
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- Total Questions: 85
- Updated on: Oct 20, 2026
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- Total Questions: 85
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Oracle 1z0-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Core APIs | - Java standard library usage
|
| Topic 2: Exception Handling and Debugging | - Error handling mechanisms
|
| Topic 3: Input/Output and File Handling | - NIO and file operations
|
| Topic 4: Object-Oriented Programming | - Core OOP principles
|
| Topic 5: Database Connectivity (JDBC) | - Database interaction
|
| Topic 6: Java Language Fundamentals | - Java syntax and language structure
|
| Topic 7: Advanced Java Features (Java SE 21) | - Modern language features
|
| Topic 8: Concurrency and Multithreading | - Thread management
|
Oracle Java SE 21 Developer Professional Sample Questions:
Given:
java
double amount = 42_000.00;
NumberFormat format = NumberFormat.getCompactNumberInstance(Locale.FRANCE, NumberFormat.Style.
SHORT);
System.out.println(format.format(amount));
What is the output?
- A. 42000
- B. 42000E
- C. 42 k
- D. 42 000,00 €
Correct Answer: C 🗳️
Explanation: Only visible for UpdateDumps members. You can sign-up / login (it's free).
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. Compilation fails.
- B. bread:Baguette, dish:Frog legs, no cheese.
- C. bread:bread, dish:dish, cheese.
- D. bread:Baguette, dish:Frog legs, cheese.
Correct Answer: B 🗳️
Explanation: Only visible for UpdateDumps members. You can sign-up / login (it's free).
Which of the following methods of java.util.function.Predicate aredefault methods?
- A. and(Predicate<? super T> other)
- B. test(T t)
- C. not(Predicate<? super T> target)
- D. negate()
- E. isEqual(Object targetRef)
- F. or(Predicate<? super T> other)
Correct Answer: A,D,F 🗳️
Explanation: Only visible for UpdateDumps members. You can sign-up / login (it's free).
Given:
java
String textBlock = """
j \
a \t
v \s
a \
""";
System.out.println(textBlock.length());
What is the output?
- A. 11
- B. 10
- C. 12
- D. 14
Correct Answer: C 🗳️
Explanation: Only visible for UpdateDumps members. You can sign-up / login (it's free).
Given:
java
Deque<Integer> deque = new ArrayDeque<>();
deque.offer(1);
deque.offer(2);
var i1 = deque.peek();
var i2 = deque.poll();
var i3 = deque.peek();
System.out.println(i1 + " " + i2 + " " + i3);
What is the output of the given code fragment?
- A. 2 2 2
- B. 1 2 2
- C. 2 1 1
- D. 1 1 2
- E. 2 1 2
- F. 2 2 1
- G. 1 2 1
- H. 1 1 1
- I. An exception is thrown.
Correct Answer: B 🗳️
Explanation: Only visible for UpdateDumps members. You can sign-up / login (it's free).
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