Study with 1z1-830 Actual Test Questions
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Last Updated: Sep 18, 2026
No. of Questions: 85 Questions & Answers with Testing Engine
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Oracle 1z1-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Annotations and JDBC | - Execute SQL operations and process results - Use built-in and custom annotations - Connect to databases using JDBC |
| 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 |
| Modules and Packaging | - Manage dependencies and exports - Create and use Java modules - Package and deploy applications |
| Object-Oriented Programming | - Apply inheritance and polymorphism - Create and use classes, interfaces, enums, and records - Implement encapsulation and abstraction |
| Functional Programming | - Use lambda expressions and method references - Process data using Stream API - Work with functional interfaces |
| Controlling Program Flow | - Use switch expressions and pattern matching - Apply decision statements and loops - Work with records and sealed classes |
| Exception Handling | - Handle checked and unchecked exceptions - Use try-with-resources - Create custom exceptions |
| Collections and Generics | - Use List, Set, Map, Queue, and Deque implementations - Use sequenced collections and maps - Apply generics and bounded types |
| Java I/O and NIO | - Use Path, Files, and related APIs - Read and write files - Process file system resources |
| Java Concurrency | - Create and manage threads - Work with concurrent collections and executors - Use virtual threads |
Oracle Java SE 21 Developer Professional Sample Questions:
Given:
java
String textBlock = """
j \
a \t
v \s
a \
""";
System.out.println(textBlock.length());
What is the output?
- A. 12
- B. 14
- C. 10
- D. 11
Correct Answer: A 🗳️
Explanation: Only visible for Actualtests4sure members. You can sign-up / login (it's free).
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. Compilation fails
- B. 3.3
- C. true
- D. An exception is thrown at runtime
- E. false
Correct Answer: A 🗳️
Explanation: Only visible for Actualtests4sure members. You can sign-up / login (it's free).
Given:
java
public class Test {
static int count;
synchronized Test() {
count++;
}
public static void main(String[] args) throws InterruptedException {
Runnable task = Test::new;
Thread t1 = new Thread(task);
Thread t2 = new Thread(task);
t1.start();
t2.start();
t1.join();
t2.join();
System.out.println(count);
}
}
What is the given program's output?
- A. Compilation fails
- B. It's always 2
- C. It's always 1
- D. It's either 1 or 2
- E. It's either 0 or 1
Correct Answer: A 🗳️
Explanation: Only visible for Actualtests4sure members. You can sign-up / login (it's free).
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. array1
- B. array2
- C. array4
- D. array5
- E. array3
Correct Answer: A,D 🗳️
Explanation: Only visible for Actualtests4sure members. You can sign-up / login (it's free).
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. Compilation fails.
- C. true
- D. A NullPointerException is thrown.
- E. false
Correct Answer: C 🗳️
Explanation: Only visible for Actualtests4sure members. You can sign-up / login (it's free).
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