Java SE 21 Developer Professional: 1z0-830 Exam Premium File as PDF & Test Engine
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Last Updated: Oct 08, 2026
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Oracle 1z0-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| 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 | - Process file system resources - Read and write files - Use Path, Files, and related APIs |
| Object-Oriented Programming | - Apply inheritance and polymorphism - Implement encapsulation and abstraction - Create and use classes, interfaces, enums, and records |
| 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 |
| Modules and Packaging | - Manage dependencies and exports - Package and deploy applications - Create and use Java modules |
| Exception Handling | - Handle checked and unchecked exceptions - Use try-with-resources - Create custom exceptions |
| Java Concurrency | - Create and manage threads - Use virtual threads - Work with concurrent collections and executors |
| Annotations and JDBC | - Connect to databases using JDBC - Use built-in and custom annotations - Execute SQL operations and process results |
| Functional Programming | - Work with functional interfaces - Use lambda expressions and method references - Process data using Stream API |
| Collections and Generics | - Apply generics and bounded types - Use sequenced collections and maps - Use List, Set, Map, Queue, and Deque implementations |
Oracle Java SE 21 Developer Professional Sample Questions:
Given:
java
public class OuterClass {
String outerField = "Outer field";
class InnerClass {
void accessMembers() {
System.out.println(outerField);
}
}
public static void main(String[] args) {
System.out.println("Inner class:");
System.out.println("------------");
OuterClass outerObject = new OuterClass();
InnerClass innerObject = new InnerClass(); // n1
innerObject.accessMembers(); // n2
}
}
What is printed?
- A. Nothing
- B. markdown
Inner class:
------------
Outer field - C. Compilation fails at line n2.
- D. Compilation fails at line n1.
- E. An exception is thrown at runtime.
Correct Answer: D 🗳️
Explanation: Only visible for Fast2test members. You can sign-up / login (it's free).
Given:
java
StringBuilder result = Stream.of("a", "b")
.collect(
() -> new StringBuilder("c"),
StringBuilder::append,
(a, b) -> b.append(a)
);
System.out.println(result);
What is the output of the given code fragment?
- A. acb
- B. bac
- C. cacb
- D. cbca
- E. abc
- F. bca
- G. cba
Correct Answer: G 🗳️
Explanation: Only visible for Fast2test 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 Fast2test members. You can sign-up / login (it's free).
Which StringBuilder variable fails to compile?
java
public class StringBuilderInstantiations {
public static void main(String[] args) {
var stringBuilder1 = new StringBuilder();
var stringBuilder2 = new StringBuilder(10);
var stringBuilder3 = new StringBuilder("Java");
var stringBuilder4 = new StringBuilder(new char[]{'J', 'a', 'v', 'a'});
}
}
- A. None of them
- B. stringBuilder4
- C. stringBuilder2
- D. stringBuilder3
- E. stringBuilder1
Correct Answer: B 🗳️
Explanation: Only visible for Fast2test members. You can sign-up / login (it's free).
Given:
java
var ceo = new HashMap<>();
ceo.put("Sundar Pichai", "Google");
ceo.put("Tim Cook", "Apple");
ceo.put("Mark Zuckerberg", "Meta");
ceo.put("Andy Jassy", "Amazon");
Does the code compile?
- A. False
- B. True
Correct Answer: A 🗳️
Explanation: Only visible for Fast2test members. You can sign-up / login (it's free).
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