Prepare with Oracle 1z1-830 exam practice material, pass for sure
Updated: Oct 25, 2026
No. of Questions: 85 Questions & Answers with Testing Engine
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Oracle 1z1-830 Exam Overview:
| Certification Vendor: | Oracle |
|---|---|
| Exam Name: | Java SE 21 Developer Professional |
| Exam Number: | 1Z0-830 |
| Available Languages: | English |
| Exam Format: | Multiple Choice |
| Exam Duration: | 120 minutes |
| Related Certifications: | Oracle Certified Professional: Java SE 21 Developer |
| Exam Price: | $245 USD |
| Passing Score: | 68% |
| Real Exam Qty: | 50 |
| Sample Questions: | Oracle 1z1-830 Sample Questions |
| Exam Way: | Online proctored exam or in-person at Pearson VUE testing centers. |
| Pre Condition: | No mandatory prerequisite certification. Recommended experience with Java programming and modern Java SE features. |
| Official Syllabus URL: | https://education.oracle.com/java-se-21-developer-professional/pexam_1Z0-830 |
Oracle 1z1-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Object-Oriented Programming | - Apply inheritance and polymorphism - Create and use classes, interfaces, enums, and records - Implement encapsulation and abstraction |
| Controlling Program Flow | - Use switch expressions and pattern matching - Work with records and sealed classes - Apply decision statements and loops |
| Collections and Generics | - Apply generics and bounded types - Use List, Set, Map, Queue, and Deque implementations - Use sequenced collections and maps |
| Java I/O and NIO | - Use Path, Files, and related APIs - Process file system resources - Read and write files |
| Annotations and JDBC | - Execute SQL operations and process results - Connect to databases using JDBC - Use built-in and custom annotations |
| Handling Date, Time, Text, Numeric and Boolean Values | - Work with primitive wrappers and number formatting - Use date, time, duration, period, and localization APIs - Use String, StringBuilder, and related APIs |
| Java Concurrency | - Work with concurrent collections and executors - Create and manage threads - Use virtual threads |
| Modules and Packaging | - Package and deploy applications - Create and use Java modules - Manage dependencies and exports |
| Functional Programming | - Use lambda expressions and method references - Process data using Stream API - Work with functional interfaces |
| Exception Handling | - Handle checked and unchecked exceptions - Create custom exceptions - Use try-with-resources |
Oracle Java SE 21 Developer Professional Sample Questions:
Which of the following doesnotexist?
- A. BiSupplier<T, U, R>
- B. Supplier<T>
- C. BooleanSupplier
- D. They all exist.
- E. LongSupplier
- F. DoubleSupplier
Correct Answer: A 🗳️
Explanation: Only visible for Test4Sure 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. 42000
- C. 42 000,00 €
- D. 42 k
Correct Answer: D 🗳️
Explanation: Only visible for Test4Sure members. You can sign-up / login (it's free).
Given:
java
try (FileOutputStream fos = new FileOutputStream("t.tmp");
ObjectOutputStream oos = new ObjectOutputStream(fos)) {
fos.write("Today");
fos.writeObject("Today");
oos.write("Today");
oos.writeObject("Today");
} catch (Exception ex) {
// handle exception
}
Which statement compiles?
- A. oos.write("Today");
- B. oos.writeObject("Today");
- C. fos.write("Today");
- D. fos.writeObject("Today");
Correct Answer: B 🗳️
Explanation: Only visible for Test4Sure 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. Chanel
- B. An ArrayIndexOutOfBoundsException is thrown at runtime.
- C. Compilation fails.
- D. Chanel Dior Louis Vuitton
Correct Answer: A 🗳️
Explanation: Only visible for Test4Sure members. You can sign-up / login (it's free).
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. null
- B. Compilation fails.
- C. It's an integer with value: 42
- D. It's a double with value: 42
- E. It's a string with value: 42
- F. It throws an exception at runtime.
Correct Answer: B 🗳️
Explanation: Only visible for Test4Sure members. You can sign-up / login (it's free).
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