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Oracle 1z1-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Concurrency and Multithreading | - Thread management
|
| Object-Oriented Programming | - Core OOP principles
|
| Input/Output and File Handling | - NIO and file operations
|
| Exception Handling and Debugging | - Error handling mechanisms
|
| Database Connectivity (JDBC) | - Database interaction
|
| Advanced Java Features (Java SE 21) | - Modern language features
|
| Java Language Fundamentals | - Java syntax and language structure
|
| Core APIs | - Java standard library usage
|
Oracle Java SE 21 Developer Professional Sample Questions:
Which of the following isn't a valid option of the jdeps command?
- A. --list-deps
- B. --check-deps
- C. --generate-module-info
- D. --print-module-deps
- E. --generate-open-module
- F. --list-reduced-deps
Correct Answer: B 🗳️
Explanation: Only visible for Prep4pass members. You can sign-up / login (it's free).
Given:
java
var counter = 0;
do {
System.out.print(counter + " ");
} while (++counter < 3);
What is printed?
- A. 1 2 3 4
- B. 1 2 3
- C. 0 1 2 3
- D. An exception is thrown.
- E. 0 1 2
- F. Compilation fails.
Correct Answer: E 🗳️
Explanation: Only visible for Prep4pass members. You can sign-up / login (it's free).
Which of the following methods of java.util.function.Predicate aredefault methods?
- A. test(T t)
- B. or(Predicate<? super T> other)
- C. and(Predicate<? super T> other)
- D. not(Predicate<? super T> target)
- E. negate()
- F. isEqual(Object targetRef)
Correct Answer: B,C,E 🗳️
Explanation: Only visible for Prep4pass members. You can sign-up / login (it's free).
Given:
java
Stream<String> strings = Stream.of("United", "States");
BinaryOperator<String> operator = (s1, s2) -> s1.concat(s2.toUpperCase()); String result = strings.reduce("-", operator); System.out.println(result); What is the output of this code fragment?
- A. -UNITEDSTATES
- B. United-States
- C. UNITED-STATES
- D. -UnitedStates
- E. UnitedStates
- F. United-STATES
- G. -UnitedSTATES
Correct Answer: G 🗳️
Explanation: Only visible for Prep4pass members. You can sign-up / login (it's free).
Given:
java
DoubleStream doubleStream = DoubleStream.of(3.3, 4, 5.25, 6.66);
Predicate<Double> doublePredicate = d -> d < 5;
System.out.println(doubleStream.anyMatch(doublePredicate));
What is printed?
- A. true
- B. 3.3
- C. Compilation fails
- D. false
- E. An exception is thrown at runtime
Correct Answer: C 🗳️
Explanation: Only visible for Prep4pass members. You can sign-up / login (it's free).
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