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Oracle 1z0-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
var ceo = new HashMap<>();
ceo.put("Sundar Pichai", "Google");
ceo.put("Tim Cook", "Apple");
ceo.put("Mark Zuckerberg", "Meta");
ceo.put("Andy Jassy", "Amazon");
Does the code compile?

A) True
B) False

2. Given:
java
public class Test {
static int count;
synchronized Test() {
count++;
}
public static void main(String[] args) throws InterruptedException {
Runnable task = Test::new;
Thread t1 = new Thread(task);
Thread t2 = new Thread(task);
t1.start();
t2.start();
t1.join();
t2.join();
System.out.println(count);
}
}
What is the given program's output?

A) It's always 2
B) It's either 1 or 2
C) It's always 1
D) Compilation fails
E) It's either 0 or 1

3. Given:
java
List<Integer> integers = List.of(0, 1, 2);
integers.stream()
.peek(System.out::print)
.limit(2)
.forEach(i -> {});
What is the output of the given code fragment?

A) An exception is thrown
B) 012
C) Nothing
D) 01
E) Compilation fails

4. Which of the following statements oflocal variables declared with varareinvalid?(Choose 4)

A) var d[] = new int[4];
B) var a = 1;(Valid: var correctly infers int)
C) var b = 2, c = 3.0;
D) var f = { 6 };
E) var h = (g = 7);
F) var e;

5. Which of the following methods of java.util.function.Predicate aredefault methods?

A) negate()
B) or(Predicate<? super T> other)
C) and(Predicate<? super T> other)
D) not(Predicate<? super T> target)
E) test(T t)
F) isEqual(Object targetRef)

Solutions: