Passing exam with 1z1-830 latest training materials
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Updated: Aug 07, 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 |
| Related Certifications: | Oracle Certified Professional: Java SE 21 Developer |
| Exam Format: | Multiple Choice |
| Exam Duration: | 120 minutes |
| Available Languages: | English |
| Exam Price: | $245 USD |
| Real Exam Qty: | 50 |
| Passing Score: | 68% |
| 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 |
|---|---|
| Topic 1: Object-Oriented Programming | - Apply inheritance and polymorphism - Create and use classes, interfaces, enums, and records - Implement encapsulation and abstraction |
| Topic 2: Annotations and JDBC | - Use built-in and custom annotations - Execute SQL operations and process results - Connect to databases using JDBC |
| Topic 3: Exception Handling | - Use try-with-resources - Create custom exceptions - Handle checked and unchecked exceptions |
| Topic 4: Modules and Packaging | - Create and use Java modules - Manage dependencies and exports - Package and deploy applications |
| Topic 5: Handling Date, Time, Text, Numeric and Boolean Values | - Use date, time, duration, period, and localization APIs - Use String, StringBuilder, and related APIs - Work with primitive wrappers and number formatting |
| Topic 6: Java I/O and NIO | - Process file system resources - Use Path, Files, and related APIs - Read and write files |
| Topic 7: Functional Programming | - Use lambda expressions and method references - Work with functional interfaces - Process data using Stream API |
| Topic 8: Collections and Generics | - Apply generics and bounded types - Use sequenced collections and maps - Use List, Set, Map, Queue, and Deque implementations |
| Topic 9: Controlling Program Flow | - Use switch expressions and pattern matching - Apply decision statements and loops - Work with records and sealed classes |
| Topic 10: Java Concurrency | - Work with concurrent collections and executors - Use virtual threads - Create and manage threads |
Oracle Java SE 21 Developer Professional Sample Questions:
1. Which methods compile?
A) ```java
public List<? super IOException> getListSuper() {
return new ArrayList<FileNotFoundException>();
}
B) ```java public List<? super IOException> getListSuper() { return new ArrayList<Exception>(); } csharp
C) ```java
public List<? extends IOException> getListExtends() {
return new ArrayList<FileNotFoundException>();
}
D) ```java public List<? extends IOException> getListExtends() { return new ArrayList<Exception>(); } csharp
2. Given:
java
public class ExceptionPropagation {
public static void main(String[] args) {
try {
thrower();
System.out.print("Dom Perignon, ");
} catch (Exception e) {
System.out.print("Chablis, ");
} finally {
System.out.print("Saint-Emilion");
}
}
static int thrower() {
try {
int i = 0;
return i / i;
} catch (NumberFormatException e) {
System.out.print("Rose");
return -1;
} finally {
System.out.print("Beaujolais Nouveau, ");
}
}
}
What is printed?
A) Rose
B) Saint-Emilion
C) Beaujolais Nouveau, Chablis, Saint-Emilion
D) Beaujolais Nouveau, Chablis, Dom Perignon, Saint-Emilion
3. Which of the following doesnotexist?
A) BiSupplier<T, U, R>
B) BooleanSupplier
C) They all exist.
D) DoubleSupplier
E) Supplier<T>
F) LongSupplier
4. Given:
java
List<Integer> integers = List.of(0, 1, 2);
integers.stream()
.peek(System.out::print)
.limit(2)
.forEach(i -> {});
What is the output of the given code fragment?
A) 01
B) 012
C) Nothing
D) An exception is thrown
E) Compilation fails
5. Given:
java
package com.vv;
import java.time.LocalDate;
public class FetchService {
public static void main(String[] args) throws Exception {
FetchService service = new FetchService();
String ack = service.fetch();
LocalDate date = service.fetch();
System.out.println(ack + " the " + date.toString());
}
public String fetch() {
return "ok";
}
public LocalDate fetch() {
return LocalDate.now();
}
}
What will be the output?
A) ok the 2024-07-10
B) ok the 2024-07-10T07:17:45.523939600
C) An exception is thrown
D) Compilation fails
Solutions:
| Question # 1 Answer: B,C | Question # 2 Answer: C | Question # 3 Answer: A | Question # 4 Answer: A | Question # 5 Answer: D |
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