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Oracle 1z1-830 Exam Syllabus Topics:

Section	Objectives
Topic 1: Modules and Packaging	- Create and use Java modules - Package and deploy applications - Manage dependencies and exports
Topic 2: Object-Oriented Programming	- Create and use classes, interfaces, enums, and records - Apply inheritance and polymorphism - Implement encapsulation and abstraction
Topic 3: Controlling Program Flow	- Use switch expressions and pattern matching - Work with records and sealed classes - Apply decision statements and loops
Topic 4: Java Concurrency	- Create and manage threads - Work with concurrent collections and executors - Use virtual threads
Topic 5: Annotations and JDBC	- Connect to databases using JDBC - Execute SQL operations and process results - Use built-in and custom annotations
Topic 6: Java I/O and NIO	- Use Path, Files, and related APIs - Read and write files - Process file system resources
Topic 7: Exception Handling	- Use try-with-resources - Create custom exceptions - Handle checked and unchecked exceptions
Topic 8: Handling Date, Time, Text, Numeric and Boolean Values	- Use String, StringBuilder, and related APIs - Use date, time, duration, period, and localization APIs - Work with primitive wrappers and number formatting
Topic 9: Collections and Generics	- Use sequenced collections and maps - Use List, Set, Map, Queue, and Deque implementations - Apply generics and bounded types
Topic 10: Functional Programming	- Use lambda expressions and method references - Work with functional interfaces - Process data using Stream API

Oracle Java SE 21 Developer Professional Sample Questions:

Question 1

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. markdown
Inner class:
------------
Outer field
D. Compilation fails at line n2.
E. Nothing

Question 2

Given:
java
Object input = 42;
String result = switch (input) {
case String s -> "It's a string with value: " + s;
case Double d -> "It's a double with value: " + d;
case Integer i -> "It's an integer with value: " + i;
};
System.out.println(result);
What is printed?

A. null
B. It's a string with value: 42
C. It's an integer with value: 42
D. It throws an exception at runtime.
E. Compilation fails.
F. It's a double with value: 42

Question 3

Which of the following statements are correct?

A. None
B. You can use 'public' access modifier with all kinds of classes
C. You can use 'private' access modifier with all kinds of classes
D. You can use 'final' modifier with all kinds of classes
E. You can use 'protected' access modifier with all kinds of classes

Question 4

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. array5
B. array3
C. array2
D. array4
E. array1

Question 5

Given:
java
String colors = "red\n" +
"green\n" +
"blue\n";
Which text block can replace the above code?

A. java
String colors = """
red \
green\
blue \
""";
B. java
String colors = """
red \t
green\t
blue \t
""";
C. java
String colors = """
red
green
blue
""";
D. None of the propositions
E. java
String colors = """
red \s
green\s
blue \s
""";