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Oracle 1z1-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Modules and Packaging | - Create and use Java modules - Manage dependencies and exports - Package and deploy applications |
| Collections and Generics | - Use sequenced collections and maps - Use List, Set, Map, Queue, and Deque implementations - Apply generics and bounded types |
| Java I/O and NIO | - Use Path, Files, and related APIs - Process file system resources - Read and write files |
| 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 |
| Object-Oriented Programming | - Create and use classes, interfaces, enums, and records - Implement encapsulation and abstraction - Apply inheritance and polymorphism |
| Controlling Program Flow | - Work with records and sealed classes - Use switch expressions and pattern matching - Apply decision statements and loops |
| Java Concurrency | - Work with concurrent collections and executors - Use virtual threads - Create and manage threads |
| Functional Programming | - Work with functional interfaces - Use lambda expressions and method references - Process data using Stream API |
| Exception Handling | - Handle checked and unchecked exceptions - Use try-with-resources - Create custom exceptions |
| Annotations and JDBC | - Execute SQL operations and process results - Use built-in and custom annotations - Connect to databases using JDBC |
Oracle Java SE 21 Developer Professional Sample Questions:
Which three of the following are correct about the Java module system?
- A. We must add a module descriptor to make an application developed using a Java version prior to SE9 run on Java 11.
- B. If a request is made to load a type whose package is not defined in any known module, then the module system will attempt to load it from the classpath.
- C. The unnamed module can only access packages defined in the unnamed module.
- D. The unnamed module exports all of its packages.
- E. If a package is defined in both a named module and the unnamed module, then the package in the unnamed module is ignored.
- F. Code in an explicitly named module can access types in the unnamed module.
Correct Answer: B,D,E 🗳️
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Which of the following isn't a valid option of the jdeps command?
- A. --list-reduced-deps
- B. --print-module-deps
- C. --generate-open-module
- D. --check-deps
- E. --list-deps
- F. --generate-module-info
Correct Answer: D 🗳️
Explanation: Only visible for Prep4away members. You can sign-up / login (it's free).
Given:
java
Deque<Integer> deque = new ArrayDeque<>();
deque.offer(1);
deque.offer(2);
var i1 = deque.peek();
var i2 = deque.poll();
var i3 = deque.peek();
System.out.println(i1 + " " + i2 + " " + i3);
What is the output of the given code fragment?
- A. 1 2 2
- B. An exception is thrown.
- C. 2 2 2
- D. 2 2 1
- E. 1 2 1
- F. 2 1 1
- G. 1 1 1
- H. 1 1 2
- I. 2 1 2
Correct Answer: A 🗳️
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Which two of the following aren't the correct ways to create a Stream?
- A. Stream<String> stream = Stream.builder().add("a").build();
- B. Stream stream = Stream.generate(() -> "a");
- C. Stream stream = Stream.ofNullable("a");
- D. Stream stream = Stream.of();
- E. Stream stream = Stream.empty();
- F. Stream stream = new Stream();
Correct Answer: A,F 🗳️
Given:
java
interface SmartPhone {
boolean ring();
}
class Iphone15 implements SmartPhone {
boolean isRinging;
boolean ring() {
isRinging = !isRinging;
return isRinging;
}
}
Choose the right statement.
- A. Iphone15 class does not compile
- B. Everything compiles
- C. An exception is thrown at running Iphone15.ring();
- D. SmartPhone interface does not compile
Correct Answer: A 🗳️
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