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Oracle 1z0-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

Question 1

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

Question 2

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

Question 3

Given:
java
List<Long> cannesFestivalfeatureFilms = LongStream.range(1, 1945)
.boxed()
.toList();
try (var executor = Executors.newVirtualThreadPerTaskExecutor()) {
cannesFestivalfeatureFilms.stream()
.limit(25)
.forEach(film -> executor.submit(() -> {
System.out.println(film);
}));
}
What is printed?

A. Compilation fails
B. Numbers from 1 to 25 randomly
C. Numbers from 1 to 1945 randomly
D. Numbers from 1 to 25 sequentially
E. An exception is thrown at runtime

Question 4

How would you create a ConcurrentHashMap configured to allow a maximum of 10 concurrent writer threads and an initial capacity of 42?
Which of the following options meets this requirement?

A. var concurrentHashMap = new ConcurrentHashMap(42);
B. None of the suggestions.
C. var concurrentHashMap = new ConcurrentHashMap(42, 10);
D. var concurrentHashMap = new ConcurrentHashMap();
E. var concurrentHashMap = new ConcurrentHashMap(42, 0.88f, 10);

Question 5

Given:
java
record WithInstanceField(String foo, int bar) {
double fuz;
}
record WithStaticField(String foo, int bar) {
static double wiz;
}
record ExtendingClass(String foo) extends Exception {}
record ImplementingInterface(String foo) implements Cloneable {}
Which records compile? (Select 2)

A. ImplementingInterface
B. WithStaticField
C. WithInstanceField
D. ExtendingClass

Solutions: