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Oracle 1z0-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Modules and Packaging | - Package and deploy applications - Manage dependencies and exports - Create and use Java modules |
| Java I/O and NIO | - Read and write files - Process file system resources - Use Path, Files, and related APIs |
| Controlling Program Flow | - Apply decision statements and loops - Use switch expressions and pattern matching - Work with records and sealed classes |
| Exception Handling | - Create custom exceptions - Use try-with-resources - Handle checked and unchecked exceptions |
| Java Concurrency | - Create and manage threads - Work with concurrent collections and executors - Use virtual threads |
| Functional Programming | - Process data using Stream API - Use lambda expressions and method references - Work with functional interfaces |
| Collections and Generics | - Apply generics and bounded types - Use sequenced collections and maps - Use List, Set, Map, Queue, and Deque implementations |
| Object-Oriented Programming | - Implement encapsulation and abstraction - Apply inheritance and polymorphism - Create and use classes, interfaces, enums, and records |
| Handling Date, Time, Text, Numeric and Boolean Values | - Use String, StringBuilder, and related APIs - Use date, time, duration, period, and localization APIs - Work with primitive wrappers and number formatting |
| Annotations and JDBC | - Use built-in and custom annotations - Connect to databases using JDBC - Execute SQL operations and process results |
Oracle Java SE 21 Developer Professional Sample Questions:
Which methods compile?
- A. ```java public List<? super IOException> getListSuper() { return new ArrayList<Exception>(); } csharp
- B. ```java
public List<? super IOException> getListSuper() {
return new ArrayList<FileNotFoundException>();
} - C. ```java
public List<? extends IOException> getListExtends() {
return new ArrayList<FileNotFoundException>();
} - D. ```java public List<? extends IOException> getListExtends() { return new ArrayList<Exception>(); } csharp
Correct Answer: A,C 🗳️
Explanation: Only visible for TrainingDump members. You can sign-up / login (it's free).
Which of the following statements are correct?
- A. You can use 'private' access modifier with all kinds of classes
- B. None
- C. You can use 'public' access modifier with all kinds of classes
- D. You can use 'protected' access modifier with all kinds of classes
- E. You can use 'final' modifier with all kinds of classes
Correct Answer: B 🗳️
Explanation: Only visible for TrainingDump members. You can sign-up / login (it's free).
How would you create a ConcurrentHashMap configured to allow a maximum of 10 concurrent writer threads and an initial capacity of 42?
Which of the following options meets this requirement?
- A. var concurrentHashMap = new ConcurrentHashMap(42, 0.88f, 10);
- B. var concurrentHashMap = new ConcurrentHashMap(42);
- C. var concurrentHashMap = new ConcurrentHashMap();
- D. var concurrentHashMap = new ConcurrentHashMap(42, 10);
- E. None of the suggestions.
Correct Answer: A 🗳️
Explanation: Only visible for TrainingDump members. You can sign-up / login (it's free).
Given:
java
Map<String, Integer> map = Map.of("b", 1, "a", 3, "c", 2);
TreeMap<String, Integer> treeMap = new TreeMap<>(map);
System.out.println(treeMap);
What is the output of the given code fragment?
- A. {b=1, c=2, a=3}
- B. {b=1, a=3, c=2}
- C. {c=2, a=3, b=1}
- D. Compilation fails
- E. {a=3, b=1, c=2}
- F. {c=1, b=2, a=3}
- G. {a=1, b=2, c=3}
Correct Answer: E 🗳️
Explanation: Only visible for TrainingDump members. You can sign-up / login (it's free).
Given:
java
public class ExceptionPropagation {
public static void main(String[] args) {
try {
thrower();
System.out.print("Dom Perignon, ");
} catch (Exception e) {
System.out.print("Chablis, ");
} finally {
System.out.print("Saint-Emilion");
}
}
static int thrower() {
try {
int i = 0;
return i / i;
} catch (NumberFormatException e) {
System.out.print("Rose");
return -1;
} finally {
System.out.print("Beaujolais Nouveau, ");
}
}
}
What is printed?
- A. Beaujolais Nouveau, Chablis, Dom Perignon, Saint-Emilion
- B. Saint-Emilion
- C. Beaujolais Nouveau, Chablis, Saint-Emilion
- D. Rose
Correct Answer: C 🗳️
Explanation: Only visible for TrainingDump members. You can sign-up / login (it's free).
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