Instant Download Oracle : 1z0-830 Questions & Answers as PDF & Test Engine
Updated: Nov 01, 2026
No. of Questions: 85 Questions & Answers with Testing Engine
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Oracle 1z0-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Java Language Fundamentals | - Java syntax and language structure
|
| Object-Oriented Programming | - Core OOP principles
|
| Core APIs | - Java standard library usage
|
| Input/Output and File Handling | - NIO and file operations
|
| Database Connectivity (JDBC) | - Database interaction
|
| Exception Handling and Debugging | - Error handling mechanisms
|
| Advanced Java Features (Java SE 21) | - Modern language features
|
| Concurrency and Multithreading | - Thread management
|
Oracle Java SE 21 Developer Professional Sample Questions:
Given:
java
Object input = 42;
String result = switch (input) {
case String s -> "It's a string with value: " + s;
case Double d -> "It's a double with value: " + d;
case Integer i -> "It's an integer with value: " + i;
};
System.out.println(result);
What is printed?
- A. Compilation fails.
- B. It throws an exception at runtime.
- C. null
- D. It's a double with value: 42
- E. It's a string with value: 42
- F. It's an integer with value: 42
Correct Answer: A 🗳️
Explanation: Only visible for PassTestking members. You can sign-up / login (it's free).
Given:
java
final Stream<String> strings =
Files.readAllLines(Paths.get("orders.csv"));
strings.skip(1)
.limit(2)
.forEach(System.out::println);
And that the orders.csv file contains:
mathematica
OrderID,Customer,Product,Quantity,Price
1,Kylian Mbappe,Keyboard,2,25.50
2,Teddy Riner,Mouse,1,15.99
3,Sebastien Loeb,Monitor,1,199.99
4,Antoine Griezmann,Headset,3,45.00
What is printed?
- A. An exception is thrown at runtime.
- B. Compilation fails.
- C. arduino
2,Teddy Riner,Mouse,1,15.99
3,Sebastien Loeb,Monitor,1,199.99 - D. arduino
1,Kylian Mbappe,Keyboard,2,25.50
2,Teddy Riner,Mouse,1,15.99 - E. arduino
1,Kylian Mbappe,Keyboard,2,25.50
2,Teddy Riner,Mouse,1,15.99
3,Sebastien Loeb,Monitor,1,199.99
4,Antoine Griezmann,Headset,3,45.00
Correct Answer: A,B 🗳️
Explanation: Only visible for PassTestking members. You can sign-up / login (it's free).
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. 42000E
- B. 42 k
- C. 42000
- D. 42 000,00 €
Correct Answer: B 🗳️
Explanation: Only visible for PassTestking members. You can sign-up / login (it's free).
Given:
java
int post = 5;
int pre = 5;
int postResult = post++ + 10;
int preResult = ++pre + 10;
System.out.println("postResult: " + postResult +
", preResult: " + preResult +
", Final value of post: " + post +
", Final value of pre: " + pre);
What is printed?
- A. postResult: 16, preResult: 16, Final value of post: 6, Final value of pre: 6
- B. postResult: 16, preResult: 15, Final value of post: 6, Final value of pre: 5
- C. postResult: 15, preResult: 16, Final value of post: 6, Final value of pre: 6
- D. postResult: 15, preResult: 16, Final value of post: 5, Final value of pre: 6
Correct Answer: C 🗳️
Explanation: Only visible for PassTestking members. You can sign-up / login (it's free).
Given:
java
List<String> frenchAuthors = new ArrayList<>();
frenchAuthors.add("Victor Hugo");
frenchAuthors.add("Gustave Flaubert");
Which compiles?
- A. var authorsMap3 = new HashMap<>();
java
authorsMap3.put("FR", frenchAuthors); - B. Map<String, ArrayList<String>> authorsMap1 = new HashMap<>();
java
authorsMap1.put("FR", frenchAuthors); - C. Map<String, List<String>> authorsMap4 = new HashMap<String, ArrayList<String>>(); java authorsMap4.put("FR", frenchAuthors);
- D. Map<String, ? extends List<String>> authorsMap2 = new HashMap<String, ArrayList<String>> (); java authorsMap2.put("FR", frenchAuthors);
- E. Map<String, List<String>> authorsMap5 = new HashMap<String, List<String>>(); java authorsMap5.put("FR", frenchAuthors);
Correct Answer: A,C,E 🗳️
Explanation: Only visible for PassTestking members. You can sign-up / login (it's free).
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