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Oracle Java SE 21 Developer Professional : 1z1-830 Exam

1z1-830 Exam Questions
  • Exam Code: 1z1-830
  • Exam Name: Java SE 21 Developer Professional
  • Updated: Jul 22, 2026
  • Q & A: 85 Questions and Answers
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Oracle 1z1-830 exam demo

Oracle 1z1-830 Exam Syllabus Topics:

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

                                        Oracle Java SE 21 Developer Professional Sample Questions:

                                        1. Given:
                                        java
                                        Object input = 42;
                                        String result = switch (input) {
                                        case String s -> "It's a string with value: " + s;
                                        case Double d -> "It's a double with value: " + d;
                                        case Integer i -> "It's an integer with value: " + i;
                                        };
                                        System.out.println(result);
                                        What is printed?

                                        A) It's an integer with value: 42
                                        B) Compilation fails.
                                        C) It throws an exception at runtime.
                                        D) It's a string with value: 42
                                        E) null
                                        F) It's a double with value: 42


                                        2. Given:
                                        java
                                        public class SpecialAddition extends Addition implements Special {
                                        public static void main(String[] args) {
                                        System.out.println(new SpecialAddition().add());
                                        }
                                        int add() {
                                        return --foo + bar--;
                                        }
                                        }
                                        class Addition {
                                        int foo = 1;
                                        }
                                        interface Special {
                                        int bar = 1;
                                        }
                                        What is printed?

                                        A) 2
                                        B) Compilation fails.
                                        C) It throws an exception at runtime.
                                        D) 0
                                        E) 1


                                        3. Given a properties file on the classpath named Person.properties with the content:
                                        ini
                                        name=James
                                        And:
                                        java
                                        public class Person extends ListResourceBundle {
                                        protected Object[][] getContents() {
                                        return new Object[][]{
                                        {"name", "Jeanne"}
                                        };
                                        }
                                        }
                                        And:
                                        java
                                        public class Test {
                                        public static void main(String[] args) {
                                        ResourceBundle bundle = ResourceBundle.getBundle("Person");
                                        String name = bundle.getString("name");
                                        System.out.println(name);
                                        }
                                        }
                                        What is the given program's output?

                                        A) Jeanne
                                        B) MissingResourceException
                                        C) JamesJeanne
                                        D) Compilation fails
                                        E) JeanneJames
                                        F) James


                                        4. Which methods compile?

                                        A) ```java
                                        public List<? super IOException> getListSuper() {
                                        return new ArrayList<FileNotFoundException>();
                                        }
                                        B) ```java
                                        public List<? extends IOException> getListExtends() {
                                        return new ArrayList<FileNotFoundException>();
                                        }
                                        C) ```java public List<? extends IOException> getListExtends() { return new ArrayList<Exception>(); } csharp
                                        D) ```java public List<? super IOException> getListSuper() { return new ArrayList<Exception>(); } csharp


                                        5. Given:
                                        java
                                        var counter = 0;
                                        do {
                                        System.out.print(counter + " ");
                                        } while (++counter < 3);
                                        What is printed?

                                        A) An exception is thrown.
                                        B) Compilation fails.
                                        C) 0 1 2 3
                                        D) 0 1 2
                                        E) 1 2 3 4
                                        F) 1 2 3


                                        Solutions:

                                        Question # 1
                                        Answer: B
                                        Question # 2
                                        Answer: B
                                        Question # 3
                                        Answer: A
                                        Question # 4
                                        Answer: B,D
                                        Question # 5
                                        Answer: D

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