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Real Oracle 1z1-830 practice exam questions for easy pass!
Last Updated: Sep 17, 2026
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Oracle 1z1-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Functional Programming | - Work with functional interfaces - Use lambda expressions and method references - Process data using Stream API |
| 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 |
| Modules and Packaging | - Manage dependencies and exports - Create and use Java modules - Package and deploy applications |
| Exception Handling | - Create custom exceptions - Handle checked and unchecked exceptions - Use try-with-resources |
| Java Concurrency | - Work with concurrent collections and executors - Use virtual threads - Create and manage threads |
| Object-Oriented Programming | - Create and use classes, interfaces, enums, and records - Apply inheritance and polymorphism - Implement encapsulation and abstraction |
| Collections and Generics | - Use List, Set, Map, Queue, and Deque implementations - Apply generics and bounded types - Use sequenced collections and maps |
| Java I/O and NIO | - Use Path, Files, and related APIs - Process file system resources - Read and write files |
| Controlling Program Flow | - Apply decision statements and loops - Work with records and sealed classes - Use switch expressions and pattern matching |
| Annotations and JDBC | - Use built-in and custom annotations - Execute SQL operations and process results - Connect to databases using JDBC |
Oracle Java SE 21 Developer Professional Sample Questions:
Given:
java
Deque<Integer> deque = new ArrayDeque<>();
deque.offer(1);
deque.offer(2);
var i1 = deque.peek();
var i2 = deque.poll();
var i3 = deque.peek();
System.out.println(i1 + " " + i2 + " " + i3);
What is the output of the given code fragment?
- A. 1 2 1
- B. 2 2 1
- C. 2 1 1
- D. 1 2 2
- E. 1 1 1
- F. An exception is thrown.
- G. 1 1 2
- H. 2 2 2
- I. 2 1 2
Correct Answer: D 🗳️
Explanation: Only visible for itPass4sure members. You can sign-up / login (it's free).
Which two of the following aren't the correct ways to create a Stream?
- A. Stream<String> stream = Stream.builder().add("a").build();
- B. Stream stream = new Stream();
- C. Stream stream = Stream.generate(() -> "a");
- D. Stream stream = Stream.empty();
- E. Stream stream = Stream.ofNullable("a");
- F. Stream stream = Stream.of();
Correct Answer: A,B 🗳️
Given:
java
List<String> l1 = new ArrayList<>(List.of("a", "b"));
List<String> l2 = new ArrayList<>(Collections.singletonList("c"));
Collections.copy(l1, l2);
l2.set(0, "d");
System.out.println(l1);
What is the output of the given code fragment?
- A. [c, b]
- B. An UnsupportedOperationException is thrown
- C. An IndexOutOfBoundsException is thrown
- D. [d, b]
- E. [a, b]
- F. [d]
Correct Answer: A 🗳️
Explanation: Only visible for itPass4sure 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. A a = new Test.A();
- B. B b = new B();
- C. B b = new Test.B();
- D. A a = new A();
- E. A a = new Test().new A();
- F. B b = new Test().new B();
Correct Answer: B,C,E 🗳️
Explanation: Only visible for itPass4sure members. You can sign-up / login (it's free).
Given:
java
Runnable task1 = () -> System.out.println("Executing Task-1");
Callable<String> task2 = () -> {
System.out.println("Executing Task-2");
return "Task-2 Finish.";
};
ExecutorService execService = Executors.newCachedThreadPool();
// INSERT CODE HERE
execService.awaitTermination(3, TimeUnit.SECONDS);
execService.shutdownNow();
Which of the following statements, inserted in the code above, printsboth:
"Executing Task-2" and "Executing Task-1"?
- A. execService.call(task2);
- B. execService.submit(task1);
- C. execService.run(task2);
- D. execService.submit(task2);
- E. execService.execute(task2);
- F. execService.run(task1);
- G. execService.execute(task1);
- H. execService.call(task1);
Correct Answer: B,D 🗳️
Explanation: Only visible for itPass4sure members. You can sign-up / login (it's free).
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