Try and practice the latest Oracle : 1z1-830 real questions & answers
Last Updated: Sep 30, 2026
No. of Questions: 85 Questions & Answers with Testing Engine
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Oracle 1z1-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Exception Handling and Debugging | - Error handling mechanisms
|
| Core APIs | - Java standard library usage
|
| Input/Output and File Handling | - NIO and file operations
|
| Concurrency and Multithreading | - Thread management
|
| Java Language Fundamentals | - Java syntax and language structure
|
| Object-Oriented Programming | - Core OOP principles
|
| Advanced Java Features (Java SE 21) | - Modern language features
|
| Database Connectivity (JDBC) | - Database interaction
|
Oracle Java SE 21 Developer Professional Sample Questions:
Given:
java
import java.io.*;
class A implements Serializable {
int number = 1;
}
class B implements Serializable {
int number = 2;
}
public class Test {
public static void main(String[] args) throws Exception {
File file = new File("o.ser");
A a = new A();
var oos = new ObjectOutputStream(new FileOutputStream(file));
oos.writeObject(a);
oos.close();
var ois = new ObjectInputStream(new FileInputStream(file));
B b = (B) ois.readObject();
ois.close();
System.out.println(b.number);
}
}
What is the given program's output?
- A. ClassCastException
- B. 1
- C. 2
- D. NotSerializableException
- E. Compilation fails
Correct Answer: A 🗳️
Explanation: Only visible for Actual4Cert members. You can sign-up / login (it's free).
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. Compilation fails at line n1.
- B. An exception is thrown at runtime.
- C. Nothing
- D. markdown
Inner class:
------------
Outer field - E. Compilation fails at line n2.
Correct Answer: A 🗳️
Explanation: Only visible for Actual4Cert members. You can sign-up / login (it's free).
Which of the following can be the body of a lambda expression?
- A. An expression and a statement
- B. Two expressions
- C. A statement block
- D. Two statements
- E. None of the above
Correct Answer: C 🗳️
Explanation: Only visible for Actual4Cert members. You can sign-up / login (it's free).
Given:
java
record WithInstanceField(String foo, int bar) {
double fuz;
}
record WithStaticField(String foo, int bar) {
static double wiz;
}
record ExtendingClass(String foo) extends Exception {}
record ImplementingInterface(String foo) implements Cloneable {}
Which records compile? (Select 2)
- A. WithInstanceField
- B. ImplementingInterface
- C. WithStaticField
- D. ExtendingClass
Correct Answer: B,C 🗳️
Explanation: Only visible for Actual4Cert members. You can sign-up / login (it's free).
Given:
java
var sList = new CopyOnWriteArrayList<Customer>();
Which of the following statements is correct?
- A. The CopyOnWriteArrayList class is a thread-safe variant of ArrayList where all mutative operations are implemented by making a fresh copy of the underlying array.
- B. Element-changing operations on iterators of CopyOnWriteArrayList, such as remove, set, and add, are supported and do not throw UnsupportedOperationException.
- C. The CopyOnWriteArrayList class is not thread-safe and does not prevent interference amongconcurrent threads.
- D. The CopyOnWriteArrayList class's iterator reflects all additions, removals, or changes to the list since the iterator was created.
- E. The CopyOnWriteArrayList class does not allow null elements.
Correct Answer: A 🗳️
Explanation: Only visible for Actual4Cert members. You can sign-up / login (it's free).
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