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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
int post = 5;
int pre = 5;
int postResult = post++ + 10;
int preResult = ++pre + 10;
System.out.println("postResult: " + postResult +
", preResult: " + preResult +
", Final value of post: " + post +
", Final value of pre: " + pre);
What is printed?

A) postResult: 15, preResult: 16, Final value of post: 5, Final value of pre: 6
B) postResult: 16, preResult: 15, Final value of post: 6, Final value of pre: 5
C) postResult: 16, preResult: 16, Final value of post: 6, Final value of pre: 6
D) postResult: 15, preResult: 16, Final value of post: 6, Final value of pre: 6

2. Given:
java
Deque<Integer> deque = new ArrayDeque<>();
deque.offer(1);
deque.offer(2);
var i1 = deque.peek();
var i2 = deque.poll();
var i3 = deque.peek();
System.out.println(i1 + " " + i2 + " " + i3);
What is the output of the given code fragment?

A) 1 1 2
B) 1 2 1
C) 2 1 2
D) 2 2 2
E) 2 1 1
F) 2 2 1
G) An exception is thrown.
H) 1 1 1
I) 1 2 2

3. 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 3 only
B) Line 1 and line 3
C) The program successfully compiles
D) Line 2 and line 3
E) Line 1 only
F) Line 1 and line 2
G) Line 2 only

4. Given:
java
package com.vv;
import java.time.LocalDate;
public class FetchService {
public static void main(String[] args) throws Exception {
FetchService service = new FetchService();
String ack = service.fetch();
LocalDate date = service.fetch();
System.out.println(ack + " the " + date.toString());
}
public String fetch() {
return "ok";
}
public LocalDate fetch() {
return LocalDate.now();
}
}
What will be the output?

A) ok the 2024-07-10T07:17:45.523939600
B) An exception is thrown
C) Compilation fails
D) ok the 2024-07-10

5. Given:
java
Runnable task1 = () -> System.out.println("Executing Task-1");
Callable<String> task2 = () -> {
System.out.println("Executing Task-2");
return "Task-2 Finish.";
};
ExecutorService execService = Executors.newCachedThreadPool();
// INSERT CODE HERE
execService.awaitTermination(3, TimeUnit.SECONDS);
execService.shutdownNow();
Which of the following statements, inserted in the code above, printsboth:
"Executing Task-2" and "Executing Task-1"?

A) execService.run(task2);
B) execService.execute(task1);
C) execService.call(task2);
D) execService.submit(task2);
E) execService.call(task1);
F) execService.execute(task2);
G) execService.submit(task1);
H) execService.run(task1);

Solutions: