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Oracle 1z0-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

Question 1

Given:
java
public static void main(String[] args) {
try {
throw new IOException();
} catch (IOException e) {
throw new RuntimeException();
} finally {
throw new ArithmeticException();
}
}
What is the output?

A. Compilation fails
B. RuntimeException
C. IOException
D. ArithmeticException

Question 2

Which of the following statements is correct about a final class?

A. It cannot implement any interface.
B. It cannot be extended by any other class.
C. It must contain at least a final method.
D. The final keyword in its declaration must go right before the class keyword.
E. It cannot extend another class.

Question 3

Given:
java
String textBlock = """
j \
a \t
v \s
a \
""";
System.out.println(textBlock.length());
What is the output?

A. 14
B. 10
C. 11
D. 12

Question 4

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. Compilation fails
B. 1
C. NotSerializableException
D. ClassCastException
E. 2

Question 5

Given:
java
List<Integer> integers = List.of(0, 1, 2);
integers.stream()
.peek(System.out::print)
.limit(2)
.forEach(i -> {});
What is the output of the given code fragment?

A. An exception is thrown
B. Compilation fails
C. Nothing
D. 012
E. 01

Solutions: