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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:

SectionObjectives
Advanced Java Features (Java SE 21)- Modern language features
  • 1. Pattern matching for switch
    • 2. Virtual threads (Project Loom)
      • 3. Records and record patterns
        • 4. Sealed classes
          Java Language Fundamentals- Java syntax and language structure
          • 1. Control flow statements
            • 2. Data types, variables, and operators
              Concurrency and Multithreading- Thread management
              • 1. Virtual threads and structured concurrency concepts
                • 2. Thread lifecycle and synchronization
                  Input/Output and File Handling- NIO and file operations
                  • 1. Serialization basics
                    • 2. File, Path, and Streams APIs
                      Core APIs- Java standard library usage
                      • 1. Streams and functional programming
                        • 2. Collections Framework
                          • 3. Date and Time API
                            Object-Oriented Programming- Core OOP principles
                            • 1. Abstract classes and interfaces
                              • 2. Encapsulation, inheritance, polymorphism
                                Exception Handling and Debugging- Error handling mechanisms
                                • 1. Checked vs unchecked exceptions
                                  • 2. Try-with-resources
                                    Database Connectivity (JDBC)- Database interaction
                                    • 1. JDBC API usage
                                      • 2. SQL execution and result handling

                                        Oracle Java SE 21 Developer Professional Sample Questions:

                                        Question #1

                                        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.of("a");
                                        • E. Stream stream = Stream.empty();
                                        • F. Stream stream = Stream.ofNullable("a");
                                        • G. Stream stream = Stream.of();
                                        Reveal Solution  Discussion  0

                                        Correct Answer: A,B  🗳️

                                        Explanation: Only visible for itPass4sure members. You can sign-up / login (it's free).

                                        Question #2

                                        Given:
                                        java
                                        String textBlock = """
                                        j \
                                        a \t
                                        v \s
                                        a \
                                        """;
                                        System.out.println(textBlock.length());
                                        What is the output?

                                        • A. 11
                                        • B. 12
                                        • C. 14
                                        • D. 10
                                        Reveal Solution  Discussion  0

                                        Correct Answer: B  🗳️

                                        Explanation: Only visible for itPass4sure members. You can sign-up / login (it's free).

                                        Question #3

                                        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. An exception is thrown
                                        • B. Nothing
                                        • C. Compilation fails
                                        • D. 01
                                        • E. 012
                                        Reveal Solution  Discussion  0

                                        Correct Answer: D  🗳️

                                        Explanation: Only visible for itPass4sure members. You can sign-up / login (it's free).

                                        Question #4

                                        What do the following print?
                                        java
                                        import java.time.Duration;
                                        public class DividedDuration {
                                        public static void main(String[] args) {
                                        var day = Duration.ofDays(2);
                                        System.out.print(day.dividedBy(8));
                                        }
                                        }

                                        • A. PT0H
                                        • B. Compilation fails
                                        • C. PT0D
                                        • D. PT6H
                                        • E. It throws an exception
                                        Reveal Solution  Discussion  0

                                        Correct Answer: D  🗳️

                                        Explanation: Only visible for itPass4sure members. You can sign-up / login (it's free).

                                        Question #5

                                        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. Compilation fails.
                                        • B. Chanel Dior Louis Vuitton
                                        • C. Chanel
                                        • D. An ArrayIndexOutOfBoundsException is thrown at runtime.
                                        Reveal Solution  Discussion  0

                                        Correct Answer: C  🗳️

                                        Explanation: Only visible for itPass4sure members. You can sign-up / login (it's free).

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