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Oracle 1z1-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Core APIs | - Java standard library usage
|
| Topic 2: Object-Oriented Programming | - Core OOP principles
|
| Topic 3: Concurrency and Multithreading | - Thread management
|
| Topic 4: Java Language Fundamentals | - Java syntax and language structure
|
| Topic 5: Exception Handling and Debugging | - Error handling mechanisms
|
| Topic 6: Input/Output and File Handling | - NIO and file operations
|
| Topic 7: Advanced Java Features (Java SE 21) | - Modern language features
|
| Topic 8: Database Connectivity (JDBC) | - Database interaction
|
Oracle Java SE 21 Developer Professional Sample Questions:
Given:
java
var now = LocalDate.now();
var format1 = new DateTimeFormatter(ISO_WEEK_DATE);
var format2 = DateTimeFormatter.ISO_WEEK_DATE;
var format3 = new DateFormat(WEEK_OF_YEAR_FIELD);
var format4 = DateFormat.getDateInstance(WEEK_OF_YEAR_FIELD);
System.out.println(now.format(REPLACE_HERE));
Which variable prints 2025-W01-2 (present-day is 12/31/2024)?
- A. format1
- B. format2
- C. format3
- D. format4
Correct Answer: B 🗳️
Explanation: Only visible for TestValid members. You can sign-up / login (it's free).
Given:
java
int post = 5;
int pre = 5;
int postResult = post++ + 10;
int preResult = ++pre + 10;
System.out.println("postResult: " + postResult +
", preResult: " + preResult +
", Final value of post: " + post +
", Final value of pre: " + pre);
What is printed?
- A. postResult: 15, preResult: 16, Final value of post: 5, Final value of pre: 6
- B. postResult: 15, preResult: 16, Final value of post: 6, Final value of pre: 6
- C. postResult: 16, preResult: 16, Final value of post: 6, Final value of pre: 6
- D. postResult: 16, preResult: 15, Final value of post: 6, Final value of pre: 5
Correct Answer: B 🗳️
Explanation: Only visible for TestValid members. You can sign-up / login (it's free).
Which of the following java.io.Console methods doesnotexist?
- A. readPassword(String fmt, Object... args)
- B. reader()
- C. readLine()
- D. readLine(String fmt, Object... args)
- E. read()
- F. readPassword()
Correct Answer: E 🗳️
Explanation: Only visible for TestValid members. You can sign-up / login (it's free).
Given:
java
List<Integer> integers = List.of(0, 1, 2);
integers.stream()
.peek(System.out::print)
.limit(2)
.forEach(i -> {});
What is the output of the given code fragment?
- A. An exception is thrown
- B. Nothing
- C. Compilation fails
- D. 01
- E. 012
Correct Answer: D 🗳️
Explanation: Only visible for TestValid members. You can sign-up / login (it's free).
Given:
java
var _ = 3;
var $ = 7;
System.out.println(_ + $);
What is printed?
- A. _$
- B. Compilation fails.
- C. 10
- D. It throws an exception.
Correct Answer: B 🗳️
Explanation: Only visible for TestValid members. You can sign-up / login (it's free).
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