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- Total Questions: 85
- Updated on: Sep 11, 2026
- Price: $69.98
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- Total Questions: 85
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Oracle 1z0-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Exception Handling | - Use try-with-resources - Handle checked and unchecked exceptions - Create custom exceptions |
| Topic 2: Object-Oriented Programming | - Create and use classes, interfaces, enums, and records - Apply inheritance and polymorphism - Implement encapsulation and abstraction |
| Topic 3: Handling Date, Time, Text, Numeric and Boolean Values | - Work with primitive wrappers and number formatting - Use date, time, duration, period, and localization APIs - Use String, StringBuilder, and related APIs |
| Topic 4: Controlling Program Flow | - Work with records and sealed classes - Apply decision statements and loops - Use switch expressions and pattern matching |
| Topic 5: Collections and Generics | - Use sequenced collections and maps - Use List, Set, Map, Queue, and Deque implementations - Apply generics and bounded types |
| Topic 6: Functional Programming | - Use lambda expressions and method references - Process data using Stream API - Work with functional interfaces |
| Topic 7: Java I/O and NIO | - Read and write files - Use Path, Files, and related APIs - Process file system resources |
| Topic 8: Annotations and JDBC | - Use built-in and custom annotations - Connect to databases using JDBC - Execute SQL operations and process results |
| Topic 9: Java Concurrency | - Create and manage threads - Use virtual threads - Work with concurrent collections and executors |
| Topic 10: Modules and Packaging | - Create and use Java modules - Manage dependencies and exports - Package and deploy applications |
Oracle Java SE 21 Developer Professional Sample Questions:
Given:
java
List<String> abc = List.of("a", "b", "c");
abc.stream()
.forEach(x -> {
x = x.toUpperCase();
});
abc.stream()
.forEach(System.out::print);
What is the output?
- A. ABC
- B. abc
- C. Compilation fails.
- D. An exception is thrown.
Explanation: Only visible for ITPassLeader members. You can sign-up / login (it's free).
What do the following print?
java
import java.time.Duration;
public class DividedDuration {
public static void main(String[] args) {
var day = Duration.ofDays(2);
System.out.print(day.dividedBy(8));
}
}
- A. PT0D
- B. PT6H
- C. Compilation fails
- D. PT0H
- E. It throws an exception
Explanation: Only visible for ITPassLeader members. You can sign-up / login (it's free).
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. java
String colors = """
red \t
green\t
blue \t
"""; - D. java
String colors = """
red \
green\
blue \
"""; - E. None of the propositions
Explanation: Only visible for ITPassLeader members. You can sign-up / login (it's free).
Which of the following suggestions compile?(Choose two.)
- A. java
sealed class Figure permits Rectangle {}
final class Rectangle extends Figure {
float length, width;
} - B. java
public sealed class Figure
permits Circle, Rectangle {}
final class Circle extends Figure {
float radius;
}
non-sealed class Rectangle extends Figure {
float length, width;
} - C. java
public sealed class Figure
permits Circle, Rectangle {}
final sealed class Circle extends Figure {
float radius;
}
non-sealed class Rectangle extends Figure {
float length, width;
} - D. java
sealed class Figure permits Rectangle {}
public class Rectangle extends Figure {
float length, width;
}
Explanation: Only visible for ITPassLeader members. You can sign-up / login (it's free).
What do the following print?
java
public class DefaultAndStaticMethods {
public static void main(String[] args) {
WithStaticMethod.print();
}
}
interface WithDefaultMethod {
default void print() {
System.out.print("default");
}
}
interface WithStaticMethod extends WithDefaultMethod {
static void print() {
System.out.print("static");
}
}
- A. static
- B. nothing
- C. Compilation fails
- D. default
Explanation: Only visible for ITPassLeader members. You can sign-up / login (it's free).
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