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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
import java.io.*;
class A implements Serializable {
int number = 1;
}
class B implements Serializable {
int number = 2;
}
public class Test {
public static void main(String[] args) throws Exception {
File file = new File("o.ser");
A a = new A();
var oos = new ObjectOutputStream(new FileOutputStream(file));
oos.writeObject(a);
oos.close();
var ois = new ObjectInputStream(new FileInputStream(file));
B b = (B) ois.readObject();
ois.close();
System.out.println(b.number);
}
}
What is the given program's output?

A) 2
B) NotSerializableException
C) ClassCastException
D) 1
E) Compilation fails

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

3. Which of the following doesnotexist?

A) Supplier<T>
B) LongSupplier
C) BooleanSupplier
D) DoubleSupplier
E) They all exist.
F) BiSupplier<T, U, R>

4. Which three of the following are correct about the Java module system?

A) If a package is defined in both a named module and the unnamed module, then the package in the unnamed module is ignored.
B) The unnamed module exports all of its packages.
C) The unnamed module can only access packages defined in the unnamed module.
D) Code in an explicitly named module can access types in the unnamed module.
E) If a request is made to load a type whose package is not defined in any known module, then the module system will attempt to load it from the classpath.
F) We must add a module descriptor to make an application developed using a Java version prior to SE9 run on Java 11.

5. Which of the following suggestions compile?(Choose two.)

A) java
sealed class Figure permits Rectangle {}
public class Rectangle extends Figure {
float length, width;
}
B) java
public sealed class Figure
permits Circle, Rectangle {}
final sealed class Circle extends Figure {
float radius;
}
non-sealed class Rectangle extends Figure {
float length, width;
}
C) java
sealed class Figure permits Rectangle {}
final class Rectangle extends Figure {
float length, width;
}
D) java
public sealed class Figure
permits Circle, Rectangle {}
final class Circle extends Figure {
float radius;
}
non-sealed class Rectangle extends Figure {
float length, width;
}

Solutions: