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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. What do the following print?
java
public class DefaultAndStaticMethods {
public static void main(String[] args) {
WithStaticMethod.print();
}
}
interface WithDefaultMethod {
default void print() {
System.out.print("default");
}
}
interface WithStaticMethod extends WithDefaultMethod {
static void print() {
System.out.print("static");
}
}

A) Compilation fails
B) static
C) default
D) nothing

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

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

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

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

5. Given:
java
Object input = 42;
String result = switch (input) {
case String s -> "It's a string with value: " + s;
case Double d -> "It's a double with value: " + d;
case Integer i -> "It's an integer with value: " + i;
};
System.out.println(result);
What is printed?

A) It's a string with value: 42
B) It throws an exception at runtime.
C) It's an integer with value: 42
D) It's a double with value: 42
E) Compilation fails.
F) null

Solutions: