Instant Download Oracle : 1z1-830 Questions & Answers as PDF & Test Engine
Updated: Sep 27, 2026
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Oracle 1z1-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Collections and Generics | - Use List, Set, Map, Queue, and Deque implementations - Apply generics and bounded types - Use sequenced collections and maps |
| 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 |
| Java Concurrency | - Work with concurrent collections and executors - Create and manage threads - Use virtual threads |
| Functional Programming | - Use lambda expressions and method references - Process data using Stream API - Work with functional interfaces |
| Controlling Program Flow | - Apply decision statements and loops - Use switch expressions and pattern matching - Work with records and sealed classes |
| Object-Oriented Programming | - Apply inheritance and polymorphism - Create and use classes, interfaces, enums, and records - Implement encapsulation and abstraction |
| Exception Handling | - Create custom exceptions - Handle checked and unchecked exceptions - Use try-with-resources |
| Annotations and JDBC | - Use built-in and custom annotations - Execute SQL operations and process results - Connect to databases using JDBC |
| Modules and Packaging | - Create and use Java modules - Manage dependencies and exports - Package and deploy applications |
| Java I/O and NIO | - Use Path, Files, and related APIs - Read and write files - Process file system resources |
Oracle Java SE 21 Developer Professional Sample Questions:
Given:
java
var array1 = new String[]{ "foo", "bar", "buz" };
var array2[] = { "foo", "bar", "buz" };
var array3 = new String[3] { "foo", "bar", "buz" };
var array4 = { "foo", "bar", "buz" };
String array5[] = new String[]{ "foo", "bar", "buz" };
Which arrays compile? (Select 2)
- A. array2
- B. array1
- C. array5
- D. array4
- E. array3
Correct Answer: B,C 🗳️
Explanation: Only visible for ActualVCE 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. read()
- D. readPassword()
- E. readLine(String fmt, Object... args)
- F. readLine()
Correct Answer: C 🗳️
Explanation: Only visible for ActualVCE members. You can sign-up / login (it's free).
What do the following print?
java
public class Main {
int instanceVar = staticVar;
static int staticVar = 666;
public static void main(String args[]) {
System.out.printf("%d %d", new Main().instanceVar, staticVar);
}
static {
staticVar = 42;
}
}
- A. 666 666
- B. Compilation fails
- C. 666 42
- D. 42 42
Correct Answer: D 🗳️
Explanation: Only visible for ActualVCE members. You can sign-up / login (it's free).
Which of the following statements are correct?
- A. You can use 'public' access modifier with all kinds of classes
- B. None
- C. You can use 'protected' access modifier with all kinds of classes
- D. You can use 'private' 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 ActualVCE members. You can sign-up / login (it's free).
Given:
java
public class SpecialAddition extends Addition implements Special {
public static void main(String[] args) {
System.out.println(new SpecialAddition().add());
}
int add() {
return --foo + bar--;
}
}
class Addition {
int foo = 1;
}
interface Special {
int bar = 1;
}
What is printed?
- A. 0
- B. It throws an exception at runtime.
- C. 2
- D. 1
- E. Compilation fails.
Correct Answer: E 🗳️
Explanation: Only visible for ActualVCE members. You can sign-up / login (it's free).
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