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Oracle 1z0-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Collections and Generics | - Apply generics and bounded types - Use List, Set, Map, Queue, and Deque implementations - Use sequenced collections and maps |
| Topic 2: Java Concurrency | - Work with concurrent collections and executors - Create and manage threads - Use virtual threads |
| Topic 3: Annotations and JDBC | - Execute SQL operations and process results - Connect to databases using JDBC - Use built-in and custom annotations |
| Topic 4: Java I/O and NIO | - Use Path, Files, and related APIs - Process file system resources - Read and write files |
| Topic 5: Exception Handling | - Handle checked and unchecked exceptions - Use try-with-resources - Create custom exceptions |
| Topic 6: Handling Date, Time, Text, Numeric and Boolean Values | - Use date, time, duration, period, and localization APIs - Work with primitive wrappers and number formatting - Use String, StringBuilder, and related APIs |
| Topic 7: Controlling Program Flow | - Work with records and sealed classes - Apply decision statements and loops - Use switch expressions and pattern matching |
| Topic 8: Functional Programming | - Process data using Stream API - Use lambda expressions and method references - Work with functional interfaces |
| Topic 9: Object-Oriented Programming | - Implement encapsulation and abstraction - Apply inheritance and polymorphism - Create and use classes, interfaces, enums, and records |
| Topic 10: Modules and Packaging | - Manage dependencies and exports - Create and use Java modules - Package and deploy applications |
Oracle Java SE 21 Developer Professional Sample Questions:
Given:
java
var deque = new ArrayDeque<>();
deque.add(1);
deque.add(2);
deque.add(3);
deque.add(4);
deque.add(5);
System.out.print(deque.peek() + " ");
System.out.print(deque.poll() + " ");
System.out.print(deque.pop() + " ");
System.out.print(deque.element() + " ");
What is printed?
- A. 1 1 1 1
- B. 1 1 2 2
- C. 1 5 5 1
- D. 1 1 2 3
- E. 5 5 2 3
Correct Answer: D 🗳️
Explanation: Only visible for PassReview members. You can sign-up / login (it's free).
How would you create a ConcurrentHashMap configured to allow a maximum of 10 concurrent writer threads and an initial capacity of 42?
Which of the following options meets this requirement?
- A. var concurrentHashMap = new ConcurrentHashMap(42);
- B. var concurrentHashMap = new ConcurrentHashMap();
- C. var concurrentHashMap = new ConcurrentHashMap(42, 10);
- D. var concurrentHashMap = new ConcurrentHashMap(42, 0.88f, 10);
- E. None of the suggestions.
Correct Answer: D 🗳️
Explanation: Only visible for PassReview members. You can sign-up / login (it's free).
Given:
java
var now = LocalDate.now();
var format1 = new DateTimeFormatter(ISO_WEEK_DATE);
var format2 = DateTimeFormatter.ISO_WEEK_DATE;
var format3 = new DateFormat(WEEK_OF_YEAR_FIELD);
var format4 = DateFormat.getDateInstance(WEEK_OF_YEAR_FIELD);
System.out.println(now.format(REPLACE_HERE));
Which variable prints 2025-W01-2 (present-day is 12/31/2024)?
- A. format4
- B. format1
- C. format2
- D. format3
Correct Answer: C 🗳️
Explanation: Only visible for PassReview members. You can sign-up / login (it's free).
Which methods compile?
- A. ```java public List<? extends IOException> getListExtends() { return new ArrayList<Exception>(); } csharp
- 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<? super IOException> getListSuper() {
return new ArrayList<FileNotFoundException>();
}
Correct Answer: B,C 🗳️
Explanation: Only visible for PassReview members. You can sign-up / login (it's free).
Given:
java
public class Test {
class A {
}
static class B {
}
public static void main(String[] args) {
// Insert here
}
}
Which three of the following are valid statements when inserted into the given program?
- A. B b = new B();
- B. A a = new A();
- C. A a = new Test().new A();
- D. B b = new Test().new B();
- E. A a = new Test.A();
- F. B b = new Test.B();
Correct Answer: A,C,F 🗳️
Explanation: Only visible for PassReview members. You can sign-up / login (it's free).
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