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Oracle 1z0-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Input/Output and File Handling | - NIO and file operations
|
| Topic 2: Exception Handling and Debugging | - Error handling mechanisms
|
| Topic 3: Database Connectivity (JDBC) | - Database interaction
|
| Topic 4: Advanced Java Features (Java SE 21) | - Modern language features
|
| Topic 5: Object-Oriented Programming | - Core OOP principles
|
| Topic 6: Core APIs | - Java standard library usage
|
| Topic 7: Concurrency and Multithreading | - Thread management
|
| Topic 8: Java Language Fundamentals | - Java syntax and language structure
|
Oracle Java SE 21 Developer Professional Sample Questions:
Which of the following java.io.Console methods doesnotexist?
- A. readLine()
- B. readLine(String fmt, Object... args)
- C. read()
- D. readPassword(String fmt, Object... args)
- E. readPassword()
- F. reader()
Explanation: Only visible for TestkingPDF members. You can sign-up / login (it's free).
Given:
java
final Stream<String> strings =
Files.readAllLines(Paths.get("orders.csv"));
strings.skip(1)
.limit(2)
.forEach(System.out::println);
And that the orders.csv file contains:
mathematica
OrderID,Customer,Product,Quantity,Price
1,Kylian Mbappe,Keyboard,2,25.50
2,Teddy Riner,Mouse,1,15.99
3,Sebastien Loeb,Monitor,1,199.99
4,Antoine Griezmann,Headset,3,45.00
What is printed?
- A. Compilation fails.
- B. arduino
1,Kylian Mbappe,Keyboard,2,25.50
2,Teddy Riner,Mouse,1,15.99 - C. An exception is thrown at runtime.
- D. arduino
2,Teddy Riner,Mouse,1,15.99
3,Sebastien Loeb,Monitor,1,199.99 - E. arduino
1,Kylian Mbappe,Keyboard,2,25.50
2,Teddy Riner,Mouse,1,15.99
3,Sebastien Loeb,Monitor,1,199.99
4,Antoine Griezmann,Headset,3,45.00
Explanation: Only visible for TestkingPDF members. You can sign-up / login (it's free).
Given:
java
Stream<String> strings = Stream.of("United", "States");
BinaryOperator<String> operator = (s1, s2) -> s1.concat(s2.toUpperCase()); String result = strings.reduce("-", operator); System.out.println(result); What is the output of this code fragment?
- A. United-STATES
- B. United-States
- C. UNITED-STATES
- D. -UNITEDSTATES
- E. -UnitedSTATES
- F. UnitedStates
- G. -UnitedStates
Explanation: Only visible for TestkingPDF members. You can sign-up / login (it's free).
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. Compilation fails
- B. James
- C. JeanneJames
- D. MissingResourceException
- E. JamesJeanne
- F. Jeanne
Explanation: Only visible for TestkingPDF members. You can sign-up / login (it's free).
Given:
java
var deque = new ArrayDeque<>();
deque.add(1);
deque.add(2);
deque.add(3);
deque.add(4);
deque.add(5);
System.out.print(deque.peek() + " ");
System.out.print(deque.poll() + " ");
System.out.print(deque.pop() + " ");
System.out.print(deque.element() + " ");
What is printed?
- A. 1 5 5 1
- B. 1 1 2 2
- C. 1 1 2 3
- D. 5 5 2 3
- E. 1 1 1 1
Explanation: Only visible for TestkingPDF members. You can sign-up / login (it's free).
Hobart -
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