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Oracle 1z0-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Java Concurrency | - Work with concurrent collections and executors - Use virtual threads - Create and manage threads |
| Functional Programming | - Process data using Stream API - Use lambda expressions and method references - Work with functional interfaces |
| Exception Handling | - Handle checked and unchecked exceptions - Create custom exceptions - Use try-with-resources |
| Modules and Packaging | - Manage dependencies and exports - Create and use Java modules - Package and deploy applications |
| Java I/O and NIO | - Use Path, Files, and related APIs - Process file system resources - Read and write files |
| Handling Date, Time, Text, Numeric and Boolean Values | - Use date, time, duration, period, and localization APIs - Use String, StringBuilder, and related APIs - Work with primitive wrappers and number formatting |
| Object-Oriented Programming | - Implement encapsulation and abstraction - Create and use classes, interfaces, enums, and records - Apply inheritance and polymorphism |
| Annotations and JDBC | - Connect to databases using JDBC - Use built-in and custom annotations - Execute SQL operations and process results |
| Controlling Program Flow | - Work with records and sealed classes - Use switch expressions and pattern matching - Apply decision statements and loops |
| Collections and Generics | - Apply generics and bounded types - Use List, Set, Map, Queue, and Deque implementations - Use sequenced collections and maps |
Oracle Java SE 21 Developer Professional Sample Questions:
Which of the following methods of java.util.function.Predicate aredefault methods?
- A. not(Predicate<? super T> target)
- B. isEqual(Object targetRef)
- C. negate()
- D. or(Predicate<? super T> other)
- E. and(Predicate<? super T> other)
- F. test(T t)
Correct Answer: C,D,E 🗳️
Explanation: Only visible for Dumps4PDF members. You can sign-up / login (it's free).
Given:
java
Object myVar = 0;
String print = switch (myVar) {
case int i -> "integer";
case long l -> "long";
case String s -> "string";
default -> "";
};
System.out.println(print);
What is printed?
- A. integer
- B. string
- C. long
- D. Compilation fails.
- E. nothing
- F. It throws an exception at runtime.
Correct Answer: D 🗳️
Explanation: Only visible for Dumps4PDF members. You can sign-up / login (it's free).
Given:
java
Map<String, Integer> map = Map.of("b", 1, "a", 3, "c", 2);
TreeMap<String, Integer> treeMap = new TreeMap<>(map);
System.out.println(treeMap);
What is the output of the given code fragment?
- A. {a=1, b=2, c=3}
- B. {a=3, b=1, c=2}
- C. {b=1, a=3, c=2}
- D. {b=1, c=2, a=3}
- E. Compilation fails
- F. {c=1, b=2, a=3}
- G. {c=2, a=3, b=1}
Correct Answer: B 🗳️
Explanation: Only visible for Dumps4PDF members. You can sign-up / login (it's free).
Given:
java
var now = LocalDate.now();
var format1 = new DateTimeFormatter(ISO_WEEK_DATE);
var format2 = DateTimeFormatter.ISO_WEEK_DATE;
var format3 = new DateFormat(WEEK_OF_YEAR_FIELD);
var format4 = DateFormat.getDateInstance(WEEK_OF_YEAR_FIELD);
System.out.println(now.format(REPLACE_HERE));
Which variable prints 2025-W01-2 (present-day is 12/31/2024)?
- A. format2
- B. format4
- C. format1
- D. format3
Correct Answer: A 🗳️
Explanation: Only visible for Dumps4PDF members. You can sign-up / login (it's free).
What do the following print?
java
public class DefaultAndStaticMethods {
public static void main(String[] args) {
WithStaticMethod.print();
}
}
interface WithDefaultMethod {
default void print() {
System.out.print("default");
}
}
interface WithStaticMethod extends WithDefaultMethod {
static void print() {
System.out.print("static");
}
}
- A. Compilation fails
- B. nothing
- C. static
- D. default
Correct Answer: C 🗳️
Explanation: Only visible for Dumps4PDF members. You can sign-up / login (it's free).
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