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Oracle 1z0-830 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Java I/O and Localization | 5% | - Resource bundles, locale, formatting messages, numbers, dates - File I/O, NIO.2, streams, readers/writers, serialization |
| Topic 2: Handling Date, Time, Text, Numeric and Boolean Values | 12% | - Use primitives and wrapper classes, evaluate expressions and apply type conversions - Manipulate text, text blocks, String, StringBuilder and StringBuffer - Use Date-Time API: LocalDate, LocalTime, LocalDateTime, Period, Duration, Instant, ZonedDateTime |
| Topic 3: Handling Exceptions | 8% | - Exception hierarchy, try-catch-finally, multi-catch, try-with-resources - Create and use custom exceptions, throw, throws |
| Topic 4: Using Object-Oriented Concepts | 20% | - Classes, records, objects, constructors, initializers, methods, fields, encapsulation - Overloading, overriding, Object class methods, immutable objects - Enums, nested classes, local variable type inference - Inheritance, abstract classes, sealed classes, interfaces, polymorphism |
| Topic 5: Controlling Program Flow | 10% | - Loops: for, enhanced for, while, do-while, break, continue, return - Decision constructs: if-else, switch expressions and statements, pattern matching |
| Topic 6: Concurrency and Multithreading | 10% | - Thread lifecycle, Runnable, Callable, ExecutorService, virtual threads - Synchronization, locks, concurrent collections, thread safety |
| Topic 7: Modules and Packaging | 5% | - Module system: module-info.java, exports, requires, provides, uses - Create and use JAR files, modular and non-modular builds |
| Topic 8: Advanced Features and Annotations | 3% | - Annotations, built-in annotations, custom annotations - Generics, type parameters, wildcards, type erasure |
| Topic 9: Working with Arrays and Collections | 12% | - Declare, instantiate, initialize, use arrays and multidimensional arrays - Collections Framework: List, Set, Map, Deque, Queue, sorting, searching |
| Topic 10: Functional Programming and Streams | 15% | - Stream API: create, intermediate/terminal operations, parallel streams, grouping, partitioning - Lambda expressions, functional interfaces, method references - Optional class, primitive streams |
Oracle Java SE 21 Developer Professional Sample Questions:
Given:
java
Optional<String> optionalName = Optional.ofNullable(null);
String bread = optionalName.orElse("Baguette");
System.out.print("bread:" + bread);
String dish = optionalName.orElseGet(() -> "Frog legs");
System.out.print(", dish:" + dish);
try {
String cheese = optionalName.orElseThrow(() -> new Exception());
System.out.println(", cheese:" + cheese);
} catch (Exception exc) {
System.out.println(", no cheese.");
}
What is printed?
- A. bread:Baguette, dish:Frog legs, cheese.
- B. bread:Baguette, dish:Frog legs, no cheese.
- C. Compilation fails.
- D. bread:bread, dish:dish, cheese.
Correct Answer: B 🗳️
Explanation: Only visible for ExamPrepAway members. You can sign-up / login (it's free).
Which of the following suggestions compile?(Choose two.)
- A. java
public sealed class Figure
permits Circle, Rectangle {}
final sealed class Circle extends Figure {
float radius;
}
non-sealed class Rectangle extends Figure {
float length, width;
} - B. java
public sealed class Figure
permits Circle, Rectangle {}
final class Circle extends Figure {
float radius;
}
non-sealed class Rectangle extends Figure {
float length, width;
} - C. java
sealed class Figure permits Rectangle {}
final class Rectangle extends Figure {
float length, width;
} - D. java
sealed class Figure permits Rectangle {}
public class Rectangle extends Figure {
float length, width;
}
Correct Answer: B,C 🗳️
Explanation: Only visible for ExamPrepAway members. You can sign-up / login (it's free).
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
green
blue
"""; - C. None of the propositions
- D. java
String colors = """
red \t
green\t
blue \t
"""; - E. java
String colors = """
red \s
green\s
blue \s
""";
Correct Answer: B 🗳️
Explanation: Only visible for ExamPrepAway 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. array5
- C. array4
- D. array3
- E. array2
Correct Answer: A,B 🗳️
Explanation: Only visible for ExamPrepAway members. You can sign-up / login (it's free).
Given:
java
try (FileOutputStream fos = new FileOutputStream("t.tmp");
ObjectOutputStream oos = new ObjectOutputStream(fos)) {
fos.write("Today");
fos.writeObject("Today");
oos.write("Today");
oos.writeObject("Today");
} catch (Exception ex) {
// handle exception
}
Which statement compiles?
- A. oos.write("Today");
- B. fos.writeObject("Today");
- C. fos.write("Today");
- D. oos.writeObject("Today");
Correct Answer: D 🗳️
Explanation: Only visible for ExamPrepAway members. You can sign-up / login (it's free).
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