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Oracle 1z0-830 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Handling Exceptions | 8% | - Create and use custom exceptions, throw, throws - Exception hierarchy, try-catch-finally, multi-catch, try-with-resources |
| Topic 2: Using Object-Oriented Concepts | 20% | - Enums, nested classes, local variable type inference - Classes, records, objects, constructors, initializers, methods, fields, encapsulation - Overloading, overriding, Object class methods, immutable objects - Inheritance, abstract classes, sealed classes, interfaces, polymorphism |
| Topic 3: Working with Arrays and Collections | 12% | - Declare, instantiate, initialize, use arrays and multidimensional arrays - Collections Framework: List, Set, Map, Deque, Queue, sorting, searching |
| Topic 4: 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 5: Advanced Features and Annotations | 3% | - Annotations, built-in annotations, custom annotations - Generics, type parameters, wildcards, type erasure |
| Topic 6: Modules and Packaging | 5% | - Module system: module-info.java, exports, requires, provides, uses - Create and use JAR files, modular and non-modular builds |
| Topic 7: Concurrency and Multithreading | 10% | - Synchronization, locks, concurrent collections, thread safety - Thread lifecycle, Runnable, Callable, ExecutorService, virtual threads |
| Topic 8: Functional Programming and Streams | 15% | - Lambda expressions, functional interfaces, method references - Stream API: create, intermediate/terminal operations, parallel streams, grouping, partitioning - Optional class, primitive streams |
| Topic 9: Java I/O and Localization | 5% | - File I/O, NIO.2, streams, readers/writers, serialization - Resource bundles, locale, formatting messages, numbers, dates |
| Topic 10: Handling Date, Time, Text, Numeric and Boolean Values | 12% | - Manipulate text, text blocks, String, StringBuilder and StringBuffer - Use primitives and wrapper classes, evaluate expressions and apply type conversions - Use Date-Time API: LocalDate, LocalTime, LocalDateTime, Period, Duration, Instant, ZonedDateTime |
Oracle Java SE 21 Developer Professional Sample Questions:
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. markdown
Inner class:
------------
Outer field - B. Compilation fails at line n2.
- C. Compilation fails at line n1.
- D. An exception is thrown at runtime.
- E. Nothing
Correct Answer: C 🗳️
Explanation: Only visible for CramPDF members. You can sign-up / login (it's free).
Which of the following isn't a valid option of the jdeps command?
- A. --check-deps
- B. --list-deps
- C. --generate-open-module
- D. --list-reduced-deps
- E. --generate-module-info
- F. --print-module-deps
Correct Answer: A 🗳️
Explanation: Only visible for CramPDF members. You can sign-up / login (it's free).
Given:
java
Stream<String> strings = Stream.of("United", "States");
BinaryOperator<String> operator = (s1, s2) -> s1.concat(s2.toUpperCase()); String result = strings.reduce("-", operator); System.out.println(result); What is the output of this code fragment?
- A. United-STATES
- B. United-States
- C. -UnitedSTATES
- D. UnitedStates
- E. -UnitedStates
- F. -UNITEDSTATES
- G. UNITED-STATES
Correct Answer: C 🗳️
Explanation: Only visible for CramPDF members. You can sign-up / login (it's free).
Given:
var cabarets = new TreeMap<>();
cabarets.put(1, "Moulin Rouge");
cabarets.put(2, "Crazy Horse");
cabarets.put(3, "Paradis Latin");
cabarets.put(4, "Le Lido");
cabarets.put(5, "Folies Bergere");
System.out.println(cabarets.subMap(2, true, 5, false));
What is printed?
- A. {}
- B. CopyEdit{2=Crazy Horse, 3=Paradis Latin, 4=Le Lido, 5=Folies Bergere}
- C. An exception is thrown at runtime.
- D. {2=Crazy Horse, 3=Paradis Latin, 4=Le Lido}
- E. Compilation fails.
Correct Answer: D 🗳️
Explanation: Only visible for CramPDF members. You can sign-up / login (it's free).
Which of the following can be the body of a lambda expression?
- A. None of the above
- B. A statement block
- C. Two statements
- D. An expression and a statement
- E. Two expressions
Correct Answer: B 🗳️
Explanation: Only visible for CramPDF members. You can sign-up / login (it's free).
