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Oracle 1z0-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Exception Handling | - Create custom exceptions - Handle checked and unchecked exceptions - Use try-with-resources |
| Modules and Packaging | - Manage dependencies and exports - Package and deploy applications - Create and use Java modules |
| Collections and Generics | - Apply generics and bounded types - Use List, Set, Map, Queue, and Deque implementations - Use sequenced collections and maps |
| Controlling Program Flow | - Use switch expressions and pattern matching - Apply decision statements and loops - Work with records and sealed classes |
| Java I/O and NIO | - Read and write files - Process file system resources - Use Path, Files, and related APIs |
| 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 |
| Functional Programming | - Use lambda expressions and method references - Process data using Stream API - Work with functional interfaces |
| Annotations and JDBC | - Execute SQL operations and process results - Use built-in and custom annotations - Connect to databases using JDBC |
| Object-Oriented Programming | - Implement encapsulation and abstraction - Create and use classes, interfaces, enums, and records - Apply inheritance and polymorphism |
| Java Concurrency | - Use virtual threads - Work with concurrent collections and executors - Create and manage threads |
Oracle Java SE 21 Developer Professional Sample Questions:
Given:
java
interface A {
default void ma() {
}
}
interface B extends A {
static void mb() {
}
}
interface C extends B {
void ma();
void mc();
}
interface D extends C {
void md();
}
interface E extends D {
default void ma() {
}
default void mb() {
}
default void mc() {
}
}
Which interface can be the target of a lambda expression?
- A. C
- B. None of the above
- C. D
- D. E
- E. A
- F. B
Correct Answer: B 🗳️
Explanation: Only visible for RealVCE members. You can sign-up / login (it's free).
Given:
java
public class BoomBoom implements AutoCloseable {
public static void main(String[] args) {
try (BoomBoom boomBoom = new BoomBoom()) {
System.out.print("bim ");
throw new Exception();
} catch (Exception e) {
System.out.print("boom ");
}
}
@Override
public void close() throws Exception {
System.out.print("bam ");
throw new RuntimeException();
}
}
What is printed?
- A. bim boom
- B. bim boom bam
- C. bim bam followed by an exception
- D. Compilation fails.
- E. bim bam boom
Correct Answer: E 🗳️
Explanation: Only visible for RealVCE 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. 0 1 2
- B. 0 1 2 3
- C. 1 2 3
- D. 1 2 3 4
- E. Compilation fails.
- F. An exception is thrown.
Correct Answer: A 🗳️
Explanation: Only visible for RealVCE members. You can sign-up / login (it's free).
Which of the following statements oflocal variables declared with varareinvalid?(Choose 4)
- A. var a = 1;(Valid: var correctly infers int)
- B. var b = 2, c = 3.0;
- C. var e;
- D. var d[] = new int[4];
- E. var h = (g = 7);
- F. var f = { 6 };
Correct Answer: B,C,D,F 🗳️
Explanation: Only visible for RealVCE members. You can sign-up / login (it's free).
Which of the following java.io.Console methods doesnotexist?
- A. reader()
- B. readPassword(String fmt, Object... args)
- C. readPassword()
- D. readLine()
- E. readLine(String fmt, Object... args)
- F. read()
Correct Answer: F 🗳️
Explanation: Only visible for RealVCE members. You can sign-up / login (it's free).
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