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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. Which two of the following aren't the correct ways to create a Stream?

A) Stream stream = Stream.generate(() -> "a");
B) Stream stream = Stream.ofNullable("a");
C) Stream<String> stream = Stream.builder().add("a").build();
D) Stream stream = Stream.of();
E) Stream stream = new Stream();
F) Stream stream = Stream.empty();

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

3. 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) Compilation fails
B) {c=2, a=3, b=1}
C) {b=1, a=3, c=2}
D) {b=1, c=2, a=3}
E) {a=3, b=1, c=2}
F) {c=1, b=2, a=3}
G) {a=1, b=2, c=3}

4. 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: 16, Final value of post: 6, Final value of pre: 6
C) postResult: 16, preResult: 15, Final value of post: 6, Final value of pre: 5
D) postResult: 15, preResult: 16, Final value of post: 6, Final value of pre: 6

5. Given:
java
public class Test {
class A {
}
static class B {
}
public static void main(String[] args) {
// Insert here
}
}
Which three of the following are valid statements when inserted into the given program?

A) A a = new Test.A();
B) A a = new Test().new A();
C) B b = new Test.B();
D) A a = new A();
E) B b = new B();
F) B b = new Test().new B();

Solutions: