Java SE 21 Developer Professional: 1z1-830 Exam
"Java SE 21 Developer Professional", also known as 1z1-830 exam, is a Oracle Certification. With the complete collection of questions and answers, PrepPDF has assembled to take you through 85 Q&As to your 1z1-830 Exam preparation. In the 1z1-830 exam resources, you will cover every field and category in Java SE Certification helping to ready you for your successful Oracle Certification.
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Oracle 1z1-830 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Working with Arrays and Collections | 12% | - Declare, instantiate, initialize, use arrays and multidimensional arrays - Collections Framework: List, Set, Map, Deque, Queue, sorting, searching |
| Topic 2: 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 3: Java I/O and Localization | 5% | - Resource bundles, locale, formatting messages, numbers, dates - File I/O, NIO.2, streams, readers/writers, serialization |
| Topic 4: Advanced Features and Annotations | 3% | - Annotations, built-in annotations, custom annotations - Generics, type parameters, wildcards, type erasure |
| Topic 5: Concurrency and Multithreading | 10% | - Synchronization, locks, concurrent collections, thread safety - Thread lifecycle, Runnable, Callable, ExecutorService, virtual threads |
| Topic 6: Handling Date, Time, Text, Numeric and Boolean Values | 12% | - Use Date-Time API: LocalDate, LocalTime, LocalDateTime, Period, Duration, Instant, ZonedDateTime - Manipulate text, text blocks, String, StringBuilder and StringBuffer - Use primitives and wrapper classes, evaluate expressions and apply type conversions |
| Topic 7: Handling Exceptions | 8% | - Exception hierarchy, try-catch-finally, multi-catch, try-with-resources - Create and use custom exceptions, throw, throws |
| Topic 8: Modules and Packaging | 5% | - Module system: module-info.java, exports, requires, provides, uses - Create and use JAR files, modular and non-modular builds |
| Topic 9: 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 10: Using Object-Oriented Concepts | 20% | - Overloading, overriding, Object class methods, immutable objects - Enums, nested classes, local variable type inference - Classes, records, objects, constructors, initializers, methods, fields, encapsulation - Inheritance, abstract classes, sealed classes, interfaces, polymorphism |
Oracle Java SE 21 Developer Professional Sample Questions:
Given:
java
LocalDate localDate = LocalDate.of(2020, 8, 8);
Date date = java.sql.Date.valueOf(localDate);
DateFormat formatter = new SimpleDateFormat(/* pattern */);
String output = formatter.format(date);
System.out.println(output);
It's known that the given code prints out "August 08".
Which of the following should be inserted as the pattern?
- A. MMMM dd
- B. MMM dd
- C. MM dd
- D. MM d
Correct Answer: A 🗳️
Explanation: Only visible for PrepPDF members. You can sign-up / login (it's free).
Given:
java
ExecutorService service = Executors.newFixedThreadPool(2);
Runnable task = () -> System.out.println("Task is complete");
service.submit(task);
service.shutdown();
service.submit(task);
What happens when executing the given code fragment?
- A. It prints "Task is complete" once and throws an exception.
- B. It exits normally without printing anything to the console.
- C. It prints "Task is complete" twice and throws an exception.
- D. It prints "Task is complete" once, then exits normally.
- E. It prints "Task is complete" twice, then exits normally.
Correct Answer: A 🗳️
Explanation: Only visible for PrepPDF members. You can sign-up / login (it's free).
Which of the following methods of java.util.function.Predicate aredefault methods?
- A. isEqual(Object targetRef)
- B. and(Predicate<? super T> other)
- C. test(T t)
- D. not(Predicate<? super T> target)
- E. negate()
- F. or(Predicate<? super T> other)
Correct Answer: B,E,F 🗳️
Explanation: Only visible for PrepPDF 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. None of the above
- E. Two statements
Correct Answer: C 🗳️
Explanation: Only visible for PrepPDF members. You can sign-up / login (it's free).
Given:
java
interface Calculable {
long calculate(int i);
}
public class Test {
public static void main(String[] args) {
Calculable c1 = i -> i + 1; // Line 1
Calculable c2 = i -> Long.valueOf(i); // Line 2
Calculable c3 = i -> { throw new ArithmeticException(); }; // Line 3
}
}
Which lines fail to compile?
- A. The program successfully compiles
- B. Line 1 and line 3
- C. Line 3 only
- D. Line 2 only
- E. Line 1 only
- F. Line 1 and line 2
- G. Line 2 and line 3
Correct Answer: A 🗳️
Explanation: Only visible for PrepPDF members. You can sign-up / login (it's free).
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