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Oracle Java SE 21 Developer Professional : 1z0-830
- Exam Code: 1z0-830
- Exam Name: Java SE 21 Developer Professional
- Updated: Oct 11, 2026
- Q & A: 85 Questions and Answers
About Oracle Java SE 21 Developer Professional : 1z0-830 Exam
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Oracle 1z0-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Concurrency and Multithreading | - Thread management
|
| Topic 2: Advanced Java Features (Java SE 21) | - Modern language features
|
| Topic 3: Database Connectivity (JDBC) | - Database interaction
|
| Topic 4: Java Language Fundamentals | - Java syntax and language structure
|
| Topic 5: Core APIs | - Java standard library usage
|
| Topic 6: Input/Output and File Handling | - NIO and file operations
|
| Topic 7: Exception Handling and Debugging | - Error handling mechanisms
|
| Topic 8: Object-Oriented Programming | - Core OOP principles
|
Oracle Java SE 21 Developer Professional Sample Questions:
Question #1
Which of the following methods of java.util.function.Predicate aredefault methods?
- A. negate()
- B. and(Predicate<? super T> other)
- C. test(T t)
- D. not(Predicate<? super T> target)
- E. or(Predicate<? super T> other)
- F. isEqual(Object targetRef)
Correct Answer: A,B,E 🗳️
Explanation: Only visible for Free4Torrent members. You can sign-up / login (it's free).
Question #2
Given:
java
String colors = "red\n" +
"green\n" +
"blue\n";
Which text block can replace the above code?
- A. java
String colors = """
red \
green\
blue \
"""; - B. java
String colors = """
red \s
green\s
blue \s
"""; - C. None of the propositions
- D. java
String colors = """
red
green
blue
"""; - E. java
String colors = """
red \t
green\t
blue \t
""";
Correct Answer: D 🗳️
Explanation: Only visible for Free4Torrent members. You can sign-up / login (it's free).
Question #3
Which of the following statements oflocal variables declared with varareinvalid?(Choose 4)
- A. var e;
- B. var b = 2, c = 3.0;
- C. var h = (g = 7);
- D. var a = 1;(Valid: var correctly infers int)
- E. var d[] = new int[4];
- F. var f = { 6 };
Correct Answer: A,B,E,F 🗳️
Explanation: Only visible for Free4Torrent members. You can sign-up / login (it's free).
Question #4
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(task1);
- B. execService.run(task2);
- C. execService.execute(task2);
- D. execService.execute(task1);
- E. execService.submit(task2);
- F. execService.submit(task1);
- G. execService.call(task2);
- H. execService.run(task1);
Correct Answer: E,F 🗳️
Explanation: Only visible for Free4Torrent members. You can sign-up / login (it's free).
Question #5
Given:
java
public class Test {
static int count;
synchronized Test() {
count++;
}
public static void main(String[] args) throws InterruptedException {
Runnable task = Test::new;
Thread t1 = new Thread(task);
Thread t2 = new Thread(task);
t1.start();
t2.start();
t1.join();
t2.join();
System.out.println(count);
}
}
What is the given program's output?
- A. It's always 2
- B. It's either 0 or 1
- C. It's always 1
- D. It's either 1 or 2
- E. Compilation fails
Correct Answer: E 🗳️
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