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Oracle 1z1-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Object-Oriented Programming | - Create and use classes, interfaces, enums, and records - Apply inheritance and polymorphism - Implement encapsulation and abstraction |
| Topic 2: Java I/O and NIO | - Read and write files - Process file system resources - Use Path, Files, and related APIs |
| Topic 3: Exception Handling | - Handle checked and unchecked exceptions - Create custom exceptions - Use try-with-resources |
| Topic 4: Java Concurrency | - Use virtual threads - Create and manage threads - Work with concurrent collections and executors |
| Topic 5: Handling Date, Time, Text, Numeric and Boolean Values | - Work with primitive wrappers and number formatting - Use String, StringBuilder, and related APIs - Use date, time, duration, period, and localization APIs |
| Topic 6: Controlling Program Flow | - Apply decision statements and loops - Use switch expressions and pattern matching - Work with records and sealed classes |
| Topic 7: Modules and Packaging | - Package and deploy applications - Manage dependencies and exports - Create and use Java modules |
| Topic 8: Collections and Generics | - Apply generics and bounded types - Use sequenced collections and maps - Use List, Set, Map, Queue, and Deque implementations |
| Topic 9: Functional Programming | - Work with functional interfaces - Process data using Stream API - Use lambda expressions and method references |
| Topic 10: Annotations and JDBC | - Use built-in and custom annotations - Execute SQL operations and process results - Connect to databases using JDBC |
Oracle Java SE 21 Developer Professional Sample Questions:
Which methods compile?
- A. ```java public List<? extends IOException> getListExtends() { return new ArrayList<Exception>(); } csharp
- B. ```java
public List<? extends IOException> getListExtends() {
return new ArrayList<FileNotFoundException>();
} - C. ```java
public List<? super IOException> getListSuper() {
return new ArrayList<FileNotFoundException>();
} - D. ```java public List<? super IOException> getListSuper() { return new ArrayList<Exception>(); } csharp
Correct Answer: B,D 🗳️
Explanation: Only visible for ExamCost members. You can sign-up / login (it's free).
Given:
java
String s = " ";
System.out.print("[" + s.strip());
s = " hello ";
System.out.print("," + s.strip());
s = "h i ";
System.out.print("," + s.strip() + "]");
What is printed?
- A. [ , hello ,hi ]
- B. [ ,hello,h i]
- C. [,hello,h i]
- D. [,hello,hi]
Correct Answer: C 🗳️
Explanation: Only visible for ExamCost members. You can sign-up / login (it's free).
What is the output of the following snippet? (Assume the file exists)
java
Path path = Paths.get("C:\\home\\joe\\foo");
System.out.println(path.getName(0));
- A. IllegalArgumentException
- B. home
- C. C:
- D. C
- E. Compilation error
Correct Answer: B 🗳️
Explanation: Only visible for ExamCost 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. Rose
- B. Beaujolais Nouveau, Chablis, Saint-Emilion
- C. Beaujolais Nouveau, Chablis, Dom Perignon, Saint-Emilion
- D. Saint-Emilion
Correct Answer: B 🗳️
Explanation: Only visible for ExamCost members. You can sign-up / login (it's free).
Given:
java
interface Calculable {
long calculate(int i);
}
public class Test {
public static void main(String[] args) {
Calculable c1 = i -> i + 1; // Line 1
Calculable c2 = i -> Long.valueOf(i); // Line 2
Calculable c3 = i -> { throw new ArithmeticException(); }; // Line 3
}
}
Which lines fail to compile?
- A. Line 1 and line 3
- B. Line 1 and line 2
- C. The program successfully compiles
- D. Line 3 only
- E. Line 2 only
- F. Line 1 only
- G. Line 2 and line 3
Correct Answer: C 🗳️
Explanation: Only visible for ExamCost members. You can sign-up / login (it's free).
