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Oracle 1z0-830 valid - in .pdf
- Exam Code: 1z0-830
- Exam Name: Java SE 21 Developer Professional
- Q & A: 85 Questions and Answers
- PDF Price: $59.99
- Free Demo
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- Exam Name: Java SE 21 Developer Professional
- Q & A: 85 Questions and Answers
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Oracle 1z0-830 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Modules and Packaging | 5% | - Create and use JAR files, modular and non-modular builds - Module system: module-info.java, exports, requires, provides, uses |
| 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 |
| Advanced Features and Annotations | 3% | - Generics, type parameters, wildcards, type erasure - Annotations, built-in annotations, custom annotations |
| Working with Arrays and Collections | 12% | - Collections Framework: List, Set, Map, Deque, Queue, sorting, searching - Declare, instantiate, initialize, use arrays and multidimensional arrays |
| Concurrency and Multithreading | 10% | - Synchronization, locks, concurrent collections, thread safety - Thread lifecycle, Runnable, Callable, ExecutorService, virtual threads |
| Using Object-Oriented Concepts | 20% | - Overloading, overriding, Object class methods, immutable objects - Enums, nested classes, local variable type inference - Inheritance, abstract classes, sealed classes, interfaces, polymorphism - Classes, records, objects, constructors, initializers, methods, fields, encapsulation |
| Handling Exceptions | 8% | - Create and use custom exceptions, throw, throws - Exception hierarchy, try-catch-finally, multi-catch, try-with-resources |
| Java I/O and Localization | 5% | - Resource bundles, locale, formatting messages, numbers, dates - File I/O, NIO.2, streams, readers/writers, serialization |
| Controlling Program Flow | 10% | - Decision constructs: if-else, switch expressions and statements, pattern matching - Loops: for, enhanced for, while, do-while, break, continue, return |
| Functional Programming and Streams | 15% | - Lambda expressions, functional interfaces, method references - Optional class, primitive streams - Stream API: create, intermediate/terminal operations, parallel streams, grouping, partitioning |
Oracle Java SE 21 Developer Professional Sample Questions:
Question #1
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 NullPointerException is thrown.
- B. false
- C. A ClassCastException is thrown.
- D. true
- E. Compilation fails.
Answer: D
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Question #2
Given:
java
public class Test {
public static void main(String[] args) throws IOException {
Path p1 = Path.of("f1.txt");
Path p2 = Path.of("f2.txt");
Files.move(p1, p2);
Files.delete(p1);
}
}
In which case does the given program throw an exception?
- A. File f1.txt exists while file f2.txt doesn't
- B. Neither files f1.txt nor f2.txt exist
- C. An exception is always thrown
- D. Both files f1.txt and f2.txt exist
- E. File f2.txt exists while file f1.txt doesn't
Answer: C
Explanation: Only visible for ValidBraindumps members. You can sign-up / login (it's free).
Question #3
Which two of the following aren't the correct ways to create a Stream?
- A. Stream<String> stream = Stream.builder().add("a").build();
- B. Stream stream = Stream.empty();
- C. Stream stream = Stream.of();
- D. Stream stream = Stream.generate(() -> "a");
- E. Stream stream = Stream.ofNullable("a");
- F. Stream stream = new Stream();
- G. Stream stream = Stream.of("a");
Answer: A,F
Explanation: Only visible for ValidBraindumps members. You can sign-up / login (it's free).
Question #4
Given:
java
final Stream<String> strings =
Files.readAllLines(Paths.get("orders.csv"));
strings.skip(1)
.limit(2)
.forEach(System.out::println);
And that the orders.csv file contains:
mathematica
OrderID,Customer,Product,Quantity,Price
1,Kylian Mbappe,Keyboard,2,25.50
2,Teddy Riner,Mouse,1,15.99
3,Sebastien Loeb,Monitor,1,199.99
4,Antoine Griezmann,Headset,3,45.00
What is printed?
- A. An exception is thrown at runtime.
- B. arduino
2,Teddy Riner,Mouse,1,15.99
3,Sebastien Loeb,Monitor,1,199.99 - C. arduino
1,Kylian Mbappe,Keyboard,2,25.50
2,Teddy Riner,Mouse,1,15.99 - D. arduino
1,Kylian Mbappe,Keyboard,2,25.50
2,Teddy Riner,Mouse,1,15.99
3,Sebastien Loeb,Monitor,1,199.99
4,Antoine Griezmann,Headset,3,45.00 - E. Compilation fails.
Answer: A,E
Explanation: Only visible for ValidBraindumps members. You can sign-up / login (it's free).
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 \s
green\s
blue \s
"""; - D. java
String colors = """
red \
green\
blue \
"""; - E. None of the propositions
Answer: A
Explanation: Only visible for ValidBraindumps members. You can sign-up / login (it's free).
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