Oracle 1z1-830 : 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
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) {b=1, c=2, a=3}
B) {c=2, a=3, b=1}
C) {a=1, b=2, c=3}
D) {a=3, b=1, c=2}
E) {b=1, a=3, c=2}
F) Compilation fails
G) {c=1, b=2, a=3}

2. Given:
java
LocalDate localDate = LocalDate.of(2020, 8, 8);
Date date = java.sql.Date.valueOf(localDate);
DateFormat formatter = new SimpleDateFormat(/* pattern */);
String output = formatter.format(date);
System.out.println(output);
It's known that the given code prints out "August 08".
Which of the following should be inserted as the pattern?

A) MMMM dd
B) MMM dd
C) MM dd
D) MM d

3. What do the following print?
java
import java.time.Duration;
public class DividedDuration {
public static void main(String[] args) {
var day = Duration.ofDays(2);
System.out.print(day.dividedBy(8));
}
}

A) PT0D
B) PT6H
C) Compilation fails
D) It throws an exception
E) PT0H

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

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

Solutions: