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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
package vehicule.parent;
public class Car {
protected String brand = "Peugeot";
}
and
java
package vehicule.child;
import vehicule.parent.Car;
public class MiniVan extends Car {
public static void main(String[] args) {
Car car = new Car();
car.brand = "Peugeot 807";
System.out.println(car.brand);
}
}
What is printed?

A) An exception is thrown at runtime.
B) Peugeot 807
C) Peugeot
D) Compilation fails.

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

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

3. Given:
java
List<String> l1 = new ArrayList<>(List.of("a", "b"));
List<String> l2 = new ArrayList<>(Collections.singletonList("c"));
Collections.copy(l1, l2);
l2.set(0, "d");
System.out.println(l1);
What is the output of the given code fragment?

A) [a, b]
B) An IndexOutOfBoundsException is thrown
C) [d]
D) [d, b]
E) [c, b]
F) An UnsupportedOperationException is thrown

4. Given:
java
interface Calculable {
long calculate(int i);
}
public class Test {
public static void main(String[] args) {
Calculable c1 = i -> i + 1; // Line 1
Calculable c2 = i -> Long.valueOf(i); // Line 2
Calculable c3 = i -> { throw new ArithmeticException(); }; // Line 3
}
}
Which lines fail to compile?

A) Line 1 and line 3
B) Line 3 only
C) The program successfully compiles
D) Line 2 only
E) Line 1 and line 2
F) Line 2 and line 3
G) Line 1 only

5. Which methods compile?

A) ```java
public List<? super IOException> getListSuper() {
return new ArrayList<FileNotFoundException>();
}
B) ```java public List<? extends IOException> getListExtends() { return new ArrayList<Exception>(); } csharp
C) ```java
public List<? extends IOException> getListExtends() {
return new ArrayList<FileNotFoundException>();
}
D) ```java public List<? super IOException> getListSuper() { return new ArrayList<Exception>(); } csharp

Solutions: