Oracle 1z1-830 Exam : Java SE 21 Developer Professional

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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. 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) An exception is thrown
C) 012
D) 01
E) Nothing

2. Which of the following statements are correct?

A) You can use 'final' modifier with all kinds of classes
B) You can use 'public' access modifier with all kinds of classes
C) None
D) You can use 'protected' access modifier with all kinds of classes
E) You can use 'private' access modifier with all kinds of classes

3. Given:
java
Period p = Period.between(
LocalDate.of(2023, Month.MAY, 4),
LocalDate.of(2024, Month.MAY, 4));
System.out.println(p);
Duration d = Duration.between(
LocalDate.of(2023, Month.MAY, 4),
LocalDate.of(2024, Month.MAY, 4));
System.out.println(d);
What is the output?

A) UnsupportedTemporalTypeException
B) P1Y
UnsupportedTemporalTypeException
C) P1Y
PT8784H
D) PT8784H
P1Y

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

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

5. Given:
java
interface A {
default void ma() {
}
}
interface B extends A {
static void mb() {
}
}
interface C extends B {
void ma();
void mc();
}
interface D extends C {
void md();
}
interface E extends D {
default void ma() {
}
default void mb() {
}
default void mc() {
}
}
Which interface can be the target of a lambda expression?

A) D
B) B
C) None of the above
D) E
E) C
F) A

Solutions: