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Oracle 1z1-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Object-Oriented Programming | - Apply inheritance and polymorphism - Implement encapsulation and abstraction - Create and use classes, interfaces, enums, and records |
| Topic 2: Collections and Generics | - Apply generics and bounded types - Use List, Set, Map, Queue, and Deque implementations - Use sequenced collections and maps |
| Topic 3: Functional Programming | - Process data using Stream API - Work with functional interfaces - Use lambda expressions and method references |
| Topic 4: Annotations and JDBC | - Connect to databases using JDBC - Use built-in and custom annotations - Execute SQL operations and process results |
| Topic 5: Handling Date, Time, Text, Numeric and Boolean Values | - Use String, StringBuilder, and related APIs - Work with primitive wrappers and number formatting - Use date, time, duration, period, and localization APIs |
| Topic 6: Java Concurrency | - Use virtual threads - Create and manage threads - Work with concurrent collections and executors |
| Topic 7: Controlling Program Flow | - Use switch expressions and pattern matching - Work with records and sealed classes - Apply decision statements and loops |
| Topic 8: Exception Handling | - Create custom exceptions - Use try-with-resources - Handle checked and unchecked exceptions |
| Topic 9: Modules and Packaging | - Package and deploy applications - Create and use Java modules - Manage dependencies and exports |
| Topic 10: Java I/O and NIO | - Use Path, Files, and related APIs - Process file system resources - Read and write files |
Oracle Java SE 21 Developer Professional Sample Questions:
Given:
java
public class BoomBoom implements AutoCloseable {
public static void main(String[] args) {
try (BoomBoom boomBoom = new BoomBoom()) {
System.out.print("bim ");
throw new Exception();
} catch (Exception e) {
System.out.print("boom ");
}
}
@Override
public void close() throws Exception {
System.out.print("bam ");
throw new RuntimeException();
}
}
What is printed?
- A. bim boom bam
- B. bim bam followed by an exception
- C. Compilation fails.
- D. bim bam boom
- E. bim boom
Correct Answer: D 🗳️
Explanation: Only visible for TestInsides 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. Line 1 and line 3
- B. Line 1 only
- C. Line 2 and line 3
- D. Line 3 only
- E. Line 2 only
- F. The program successfully compiles
- G. Line 1 and line 2
Correct Answer: F 🗳️
Explanation: Only visible for TestInsides members. You can sign-up / login (it's free).
Which of the following doesnotexist?
- A. DoubleSupplier
- B. LongSupplier
- C. Supplier<T>
- D. BooleanSupplier
- E. They all exist.
- F. BiSupplier<T, U, R>
Correct Answer: F 🗳️
Explanation: Only visible for TestInsides members. You can sign-up / login (it's free).
Which of the following methods of java.util.function.Predicate aredefault methods?
- A. and(Predicate<? super T> other)
- B. isEqual(Object targetRef)
- C. test(T t)
- D. not(Predicate<? super T> target)
- E. negate()
- F. or(Predicate<? super T> other)
Correct Answer: A,E,F 🗳️
Explanation: Only visible for TestInsides 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. {c=1, b=2, a=3}
- B. {b=1, c=2, a=3}
- C. {c=2, a=3, b=1}
- D. {a=1, b=2, c=3}
- E. {b=1, a=3, c=2}
- F. Compilation fails
- G. {a=3, b=1, c=2}
Correct Answer: G 🗳️
Explanation: Only visible for TestInsides members. You can sign-up / login (it's free).
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