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Oracle 1z1-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Java Concurrency | - Work with concurrent collections and executors - Create and manage threads - Use virtual threads |
| Modules and Packaging | - Manage dependencies and exports - Create and use Java modules - Package and deploy applications |
| Collections and Generics | - Use List, Set, Map, Queue, and Deque implementations - Apply generics and bounded types - Use sequenced collections and maps |
| Exception Handling | - Create custom exceptions - Handle checked and unchecked exceptions - Use try-with-resources |
| Java I/O and NIO | - Process file system resources - Use Path, Files, and related APIs - Read and write files |
| Functional Programming | - Process data using Stream API - Use lambda expressions and method references - Work with functional interfaces |
| Annotations and JDBC | - Connect to databases using JDBC - Execute SQL operations and process results - Use built-in and custom annotations |
| Controlling Program Flow | - Apply decision statements and loops - Use switch expressions and pattern matching - Work with records and sealed classes |
| Object-Oriented Programming | - Create and use classes, interfaces, enums, and records - Apply inheritance and polymorphism - Implement encapsulation and abstraction |
| Handling Date, Time, Text, Numeric and Boolean Values | - Use String, StringBuilder, and related APIs - Work with primitive wrappers and number formatting - Use date, time, duration, period, and localization APIs |
Oracle Java SE 21 Developer Professional Sample Questions:
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. default
- B. static
- C. nothing
- D. Compilation fails
Correct Answer: B 🗳️
Explanation: Only visible for Dumpexams members. You can sign-up / login (it's free).
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.
Correct Answer: A 🗳️
Explanation: Only visible for Dumpexams members. You can sign-up / login (it's free).
Given:
java
double amount = 42_000.00;
NumberFormat format = NumberFormat.getCompactNumberInstance(Locale.FRANCE, NumberFormat.Style.
SHORT);
System.out.println(format.format(amount));
What is the output?
- A. 42000E
- B. 42000
- C. 42 000,00 €
- D. 42 k
Correct Answer: D 🗳️
Explanation: Only visible for Dumpexams members. You can sign-up / login (it's free).
Given:
java
DoubleSummaryStatistics stats1 = new DoubleSummaryStatistics();
stats1.accept(4.5);
stats1.accept(6.0);
DoubleSummaryStatistics stats2 = new DoubleSummaryStatistics();
stats2.accept(3.0);
stats2.accept(8.5);
stats1.combine(stats2);
System.out.println("Sum: " + stats1.getSum() + ", Max: " + stats1.getMax() + ", Avg: " + stats1.getAverage()); What is printed?
- A. Sum: 22.0, Max: 8.5, Avg: 5.0
- B. An exception is thrown at runtime.
- C. Compilation fails.
- D. Sum: 22.0, Max: 8.5, Avg: 5.5
Correct Answer: D 🗳️
Explanation: Only visible for Dumpexams members. You can sign-up / login (it's free).
Given:
java
var counter = 0;
do {
System.out.print(counter + " ");
} while (++counter < 3);
What is printed?
- A. 1 2 3
- B. 1 2 3 4
- C. 0 1 2
- D. Compilation fails.
- E. An exception is thrown.
- F. 0 1 2 3
Correct Answer: C 🗳️
Explanation: Only visible for Dumpexams members. You can sign-up / login (it's free).
