Learn with Oracle : 1z1-830 training material for 100% pass
Updated: Aug 17, 2026
No. of Questions: 85 Questions & Answers with Testing Engine
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Oracle 1z1-830 Exam Overview:
| Certification Vendor: | Oracle |
| Exam Name: | Oracle Java SE 21 Developer Professional |
| Exam Number: | 1Z0-830 |
| Exam Duration: | 90 minutes |
| Related Certifications: | Oracle Certified Professional: Java SE 17 Developer Oracle Certified Professional: Java SE 11 Developer |
| Passing Score: | 68% |
| Certificate Validity Period: | Does not expire |
| Real Exam Qty: | 50-60 |
| Exam Price: | USD 245 (may vary by region) |
| Exam Format: | Multiple Choice, Multiple Response, Drag and Drop |
| Available Languages: | English, Japanese |
| Recommended Training: | Oracle University Java SE 21 Training |
| Exam Registration: | Oracle Certification Registration |
| Sample Questions: | Oracle 1z1-830 Sample Questions |
| Exam Way: | Online proctored or test center-based exam |
| Pre Condition: | No strict prerequisite, but prior Java programming experience recommended |
| Official Syllabus URL: | https://education.oracle.com |
Oracle 1z1-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Concurrency and Multithreading | - Thread management
|
| Topic 2: Java Language Fundamentals | - Java syntax and language structure
|
| Topic 3: Advanced Java Features (Java SE 21) | - Modern language features
|
| Topic 4: Core APIs | - Java standard library usage
|
| Topic 5: Input/Output and File Handling | - NIO and file operations
|
| Topic 6: Exception Handling and Debugging | - Error handling mechanisms
|
| Topic 7: Database Connectivity (JDBC) | - Database interaction
|
| Topic 8: Object-Oriented Programming | - Core OOP principles
|
Oracle Java SE 21 Developer Professional Sample Questions:
1. Given:
java
var lyrics = """
Quand il me prend dans ses bras
Qu'il me parle tout bas
Je vois la vie en rose
""";
for ( int i = 0, int j = 3; i < j; i++ ) {
System.out.println( lyrics.lines()
.toList()
.get( i ) );
}
What is printed?
A) An exception is thrown at runtime.
B) vbnet
Quand il me prend dans ses bras
Qu'il me parle tout bas
Je vois la vie en rose
C) Compilation fails.
D) Nothing
2. 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) 2
B) 1
C) Compilation fails.
D) It throws an exception at runtime.
E) 0
3. Given:
java
Map<String, Integer> map = Map.of("b", 1, "a", 3, "c", 2);
TreeMap<String, Integer> treeMap = new TreeMap<>(map);
System.out.println(treeMap);
What is the output of the given code fragment?
A) {c=2, a=3, b=1}
B) {b=1, c=2, a=3}
C) {c=1, b=2, a=3}
D) {a=3, b=1, c=2}
E) {a=1, b=2, c=3}
F) Compilation fails
G) {b=1, a=3, c=2}
4. What is the output of the following snippet? (Assume the file exists)
java
Path path = Paths.get("C:\\home\\joe\\foo");
System.out.println(path.getName(0));
A) C:
B) Compilation error
C) IllegalArgumentException
D) C
E) home
5. 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) An exception is thrown at runtime.
B) Compilation fails at line n1.
C) Nothing
D) markdown
Inner class:
------------
Outer field
E) Compilation fails at line n2.
Solutions:
| Question # 1 Answer: C | Question # 2 Answer: C | Question # 3 Answer: D | Question # 4 Answer: E | Question # 5 Answer: B |
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