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Oracle 1z0-830 Exam Overview:
| Certification Vendor: | Oracle |
| Exam Name: | Oracle Java SE 21 Developer Professional |
| Exam Number: | 1Z0-830 |
| Exam Duration: | 90 minutes |
| Real Exam Qty: | 50-60 |
| Exam Price: | USD 245 (may vary by region) |
| Passing Score: | 68% |
| Related Certifications: | Oracle Certified Professional: Java SE 17 Developer Oracle Certified Professional: Java SE 11 Developer |
| Available Languages: | English, Japanese |
| Exam Format: | Multiple Choice, Multiple Response, Drag and Drop |
| Certificate Validity Period: | Does not expire |
| Recommended Training: | Oracle University Java SE 21 Training |
| Exam Registration: | Oracle Certification Registration |
| Sample Questions: | Oracle 1z0-830 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 1z0-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Core APIs | - Java standard library usage
|
| Topic 2: Exception Handling and Debugging | - Error handling mechanisms
|
| Topic 3: Input/Output and File Handling | - NIO and file operations
|
| Topic 4: Java Language Fundamentals | - Java syntax and language structure
|
| Topic 5: Concurrency and Multithreading | - Thread management
|
| Topic 6: Database Connectivity (JDBC) | - Database interaction
|
| Topic 7: Object-Oriented Programming | - Core OOP principles
|
| Topic 8: Advanced Java Features (Java SE 21) | - Modern language features
|
Oracle Java SE 21 Developer Professional Sample Questions:
1. 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 42
B) Compilation fails
C) 666 666
D) 42 42
2. Given:
java
DoubleStream doubleStream = DoubleStream.of(3.3, 4, 5.25, 6.66);
Predicate<Double> doublePredicate = d -> d < 5;
System.out.println(doubleStream.anyMatch(doublePredicate));
What is printed?
A) An exception is thrown at runtime
B) Compilation fails
C) true
D) 3.3
E) false
3. Given:
java
Integer frenchRevolution = 1789;
Object o1 = new String("1789");
Object o2 = frenchRevolution;
frenchRevolution = null;
Object o3 = o2.toString();
System.out.println(o1.equals(o3));
What is printed?
A) A ClassCastException is thrown.
B) true
C) Compilation fails.
D) false
E) A NullPointerException is thrown.
4. Which of the following java.io.Console methods doesnotexist?
A) readPassword(String fmt, Object... args)
B) read()
C) reader()
D) readLine()
E) readPassword()
F) readLine(String fmt, Object... args)
5. Which of the following methods of java.util.function.Predicate aredefault methods?
A) not(Predicate<? super T> target)
B) test(T t)
C) isEqual(Object targetRef)
D) or(Predicate<? super T> other)
E) negate()
F) and(Predicate<? super T> other)
Solutions:
| Question # 1 Answer: D | Question # 2 Answer: B | Question # 3 Answer: B | Question # 4 Answer: B | Question # 5 Answer: D,E,F |
By Eudora
