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Oracle 1z0-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Java I/O and NIO | - Use Path, Files, and related APIs - Process file system resources - Read and write files |
| Topic 2: Modules and Packaging | - Package and deploy applications - Manage dependencies and exports - Create and use Java modules |
| Topic 3: Collections and Generics | - Use List, Set, Map, Queue, and Deque implementations - Use sequenced collections and maps - Apply generics and bounded types |
| Topic 4: Java Concurrency | - Work with concurrent collections and executors - Use virtual threads - Create and manage threads |
| Topic 5: Exception Handling | - Use try-with-resources - Handle checked and unchecked exceptions - Create custom exceptions |
| Topic 6: Annotations and JDBC | - Connect to databases using JDBC - Execute SQL operations and process results - Use built-in and custom annotations |
| Topic 7: Functional Programming | - Use lambda expressions and method references - Work with functional interfaces - Process data using Stream API |
| Topic 8: Controlling Program Flow | - Work with records and sealed classes - Use switch expressions and pattern matching - Apply decision statements and loops |
| Topic 9: Object-Oriented Programming | - Apply inheritance and polymorphism - Implement encapsulation and abstraction - Create and use classes, interfaces, enums, and records |
| Topic 10: Handling Date, Time, Text, Numeric and Boolean Values | - Work with primitive wrappers and number formatting - Use date, time, duration, period, and localization APIs - Use String, StringBuilder, and related APIs |
Oracle Java SE 21 Developer Professional Sample Questions:
Which of the following methods of java.util.function.Predicate aredefault methods?
- A. and(Predicate<? super T> other)
- B. not(Predicate<? super T> target)
- C. isEqual(Object targetRef)
- D. negate()
- E. or(Predicate<? super T> other)
- F. test(T t)
Explanation: Only visible for ExamsTorrent members. You can sign-up / login (it's free).
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. Compilation fails.
- B. bread:Baguette, dish:Frog legs, cheese.
- C. bread:bread, dish:dish, cheese.
- D. bread:Baguette, dish:Frog legs, no cheese.
Explanation: Only visible for ExamsTorrent members. You can sign-up / login (it's free).
Which of the following java.io.Console methods doesnotexist?
- A. readLine()
- B. reader()
- C. readPassword()
- D. read()
- E. readLine(String fmt, Object... args)
- F. readPassword(String fmt, Object... args)
Explanation: Only visible for ExamsTorrent 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. Compilation fails
- D. {b=1, a=3, c=2}
- E. {c=1, b=2, a=3}
- F. {b=1, c=2, a=3}
- G. {c=2, a=3, b=1}
Explanation: Only visible for ExamsTorrent members. You can sign-up / login (it's free).
Given:
java
public class ExceptionPropagation {
public static void main(String[] args) {
try {
thrower();
System.out.print("Dom Perignon, ");
} catch (Exception e) {
System.out.print("Chablis, ");
} finally {
System.out.print("Saint-Emilion");
}
}
static int thrower() {
try {
int i = 0;
return i / i;
} catch (NumberFormatException e) {
System.out.print("Rose");
return -1;
} finally {
System.out.print("Beaujolais Nouveau, ");
}
}
}
What is printed?
- A. Saint-Emilion
- B. Rose
- C. Beaujolais Nouveau, Chablis, Dom Perignon, Saint-Emilion
- D. Beaujolais Nouveau, Chablis, Saint-Emilion
Explanation: Only visible for ExamsTorrent members. You can sign-up / login (it's free).
