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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
StringBuilder result = Stream.of("a", "b")
.collect(
() -> new StringBuilder("c"),
StringBuilder::append,
(a, b) -> b.append(a)
);
System.out.println(result);
What is the output of the given code fragment?

A) bca
B) abc
C) cacb
D) acb
E) cba
F) cbca
G) bac

2. Given:
java
public class OuterClass {
String outerField = "Outer field";
class InnerClass {
void accessMembers() {
System.out.println(outerField);
}
}
public static void main(String[] args) {
System.out.println("Inner class:");
System.out.println("------------");
OuterClass outerObject = new OuterClass();
InnerClass innerObject = new InnerClass(); // n1
innerObject.accessMembers(); // n2
}
}
What is printed?

A) markdown
Inner class:
------------
Outer field
B) Nothing
C) Compilation fails at line n1.
D) An exception is thrown at runtime.
E) Compilation fails at line n2.

3. Given:
java
public class SpecialAddition extends Addition implements Special {
public static void main(String[] args) {
System.out.println(new SpecialAddition().add());
}
int add() {
return --foo + bar--;
}
}
class Addition {
int foo = 1;
}
interface Special {
int bar = 1;
}
What is printed?

A) 1
B) 0
C) 2
D) It throws an exception at runtime.
E) Compilation fails.

4. 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) P1Y
PT8784H
B) PT8784H
P1Y
C) P1Y
UnsupportedTemporalTypeException
D) UnsupportedTemporalTypeException

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

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

Solutions: