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Oracle 1z0-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Exception Handling and Debugging | - Error handling mechanisms
|
| Topic 2: Concurrency and Multithreading | - Thread management
|
| Topic 3: Object-Oriented Programming | - Core OOP principles
|
| Topic 4: Database Connectivity (JDBC) | - Database interaction
|
| Topic 5: Core APIs | - Java standard library usage
|
| Topic 6: Input/Output and File Handling | - NIO and file operations
|
| Topic 7: Java Language Fundamentals | - Java syntax and language structure
|
| Topic 8: Advanced Java Features (Java SE 21) | - Modern language features
|
Oracle Java SE 21 Developer Professional Sample Questions:
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 throws an exception at runtime.
- B. It's a string with value: 42
- C. It's a double with value: 42
- D. It's an integer with value: 42
- E. null
- F. Compilation fails.
Correct Answer: F 🗳️
Explanation: Only visible for UpdateDumps members. You can sign-up / login (it's free).
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 either 1 or 2
- B. It's always 2
- C. It's always 1
- D. It's either 0 or 1
- E. Compilation fails
Correct Answer: E 🗳️
Explanation: Only visible for UpdateDumps members. You can sign-up / login (it's free).
What does the following code print?
java
import java.util.stream.Stream;
public class StreamReduce {
public static void main(String[] args) {
Stream<String> stream = Stream.of("J", "a", "v", "a");
System.out.print(stream.reduce(String::concat));
}
}
- A. Java
- B. Optional[Java]
- C. null
- D. Compilation fails
Correct Answer: B 🗳️
Explanation: Only visible for UpdateDumps members. You can sign-up / login (it's free).
Given:
java
var array1 = new String[]{ "foo", "bar", "buz" };
var array2[] = { "foo", "bar", "buz" };
var array3 = new String[3] { "foo", "bar", "buz" };
var array4 = { "foo", "bar", "buz" };
String array5[] = new String[]{ "foo", "bar", "buz" };
Which arrays compile? (Select 2)
- A. array3
- B. array1
- C. array5
- D. array2
- E. array4
Correct Answer: B,C 🗳️
Explanation: Only visible for UpdateDumps members. You can sign-up / login (it's free).
Given:
java
List<String> frenchAuthors = new ArrayList<>();
frenchAuthors.add("Victor Hugo");
frenchAuthors.add("Gustave Flaubert");
Which compiles?
- A. Map<String, List<String>> authorsMap4 = new HashMap<String, ArrayList<String>>(); java authorsMap4.put("FR", frenchAuthors);
- B. Map<String, ? extends List<String>> authorsMap2 = new HashMap<String, ArrayList<String>> (); java authorsMap2.put("FR", frenchAuthors);
- C. Map<String, List<String>> authorsMap5 = new HashMap<String, List<String>>(); java authorsMap5.put("FR", frenchAuthors);
- D. var authorsMap3 = new HashMap<>();
java
authorsMap3.put("FR", frenchAuthors); - E. Map<String, ArrayList<String>> authorsMap1 = new HashMap<>();
java
authorsMap1.put("FR", frenchAuthors);
Correct Answer: A,C,D 🗳️
Explanation: Only visible for UpdateDumps members. You can sign-up / login (it's free).
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