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Oracle 1z1-830 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: Modules and Packaging | - Create and use Java modules - Manage dependencies and exports - Package and deploy applications |
| Topic 3: Object-Oriented Programming | - Implement encapsulation and abstraction - Apply inheritance and polymorphism - Create and use classes, interfaces, enums, and records |
| Topic 4: Annotations and JDBC | - Use built-in and custom annotations - Connect to databases using JDBC - Execute SQL operations and process results |
| Topic 5: Java I/O and NIO | - Process file system resources - Use Path, Files, and related APIs - Read and write files |
| Topic 6: 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 |
| Topic 7: Functional Programming | - Use lambda expressions and method references - Process data using Stream API - Work with functional interfaces |
| Topic 8: Controlling Program Flow | - Use switch expressions and pattern matching - Work with records and sealed classes - Apply decision statements and loops |
| Topic 9: Exception Handling | - Create custom exceptions - Handle checked and unchecked exceptions - Use try-with-resources |
| Topic 10: Java Concurrency | - Create and manage threads - Work with concurrent collections and executors - Use virtual threads |
Oracle Java SE 21 Developer Professional Sample Questions:
Consider the following methods to load an implementation of MyService using ServiceLoader. Which of the methods are correct? (Choose all that apply)
- A. MyService service = ServiceLoader.load(MyService.class).findFirst().get();
- B. MyService service = ServiceLoader.getService(MyService.class);
- C. MyService service = ServiceLoader.load(MyService.class).iterator().next();
- D. MyService service = ServiceLoader.services(MyService.class).getFirstInstance();
Correct Answer: A,C 🗳️
Explanation: Only visible for BraindumpsIT 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 Test().new B();
- B. A a = new Test().new A();
- C. B b = new Test.B();
- D. B b = new B();
- E. A a = new A();
- F. A a = new Test.A();
Correct Answer: B,C,D 🗳️
Explanation: Only visible for BraindumpsIT members. You can sign-up / login (it's free).
Given:
java
Stream<String> strings = Stream.of("United", "States");
BinaryOperator<String> operator = (s1, s2) -> s1.concat(s2.toUpperCase()); String result = strings.reduce("-", operator); System.out.println(result); What is the output of this code fragment?
- A. -UnitedSTATES
- B. UNITED-STATES
- C. UnitedStates
- D. United-States
- E. -UnitedStates
- F. United-STATES
- G. -UNITEDSTATES
Correct Answer: A 🗳️
Explanation: Only visible for BraindumpsIT members. You can sign-up / login (it's free).
Which of the following doesnotexist?
- A. DoubleSupplier
- B. Supplier<T>
- C. BooleanSupplier
- D. BiSupplier<T, U, R>
- E. They all exist.
- F. LongSupplier
Correct Answer: D 🗳️
Explanation: Only visible for BraindumpsIT members. You can sign-up / login (it's free).
Given:
java
DoubleStream doubleStream = DoubleStream.of(3.3, 4, 5.25, 6.66);
Predicate<Double> doublePredicate = d -> d < 5;
System.out.println(doubleStream.anyMatch(doublePredicate));
What is printed?
- A. Compilation fails
- B. false
- C. An exception is thrown at runtime
- D. 3.3
- E. true
Correct Answer: A 🗳️
Explanation: Only visible for BraindumpsIT members. You can sign-up / login (it's free).
