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Oracle 1z1-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Concurrency and Multithreading | - Thread management
|
| Java Language Fundamentals | - Java syntax and language structure
|
| Object-Oriented Programming | - Core OOP principles
|
| Input/Output and File Handling | - NIO and file operations
|
| Core APIs | - Java standard library usage
|
| Exception Handling and Debugging | - Error handling mechanisms
|
| Advanced Java Features (Java SE 21) | - Modern language features
|
| Database Connectivity (JDBC) | - Database interaction
|
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 |








