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Oracle 1z0-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

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

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

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

3. Which StringBuilder variable fails to compile?
java
public class StringBuilderInstantiations {
public static void main(String[] args) {
var stringBuilder1 = new StringBuilder();
var stringBuilder2 = new StringBuilder(10);
var stringBuilder3 = new StringBuilder("Java");
var stringBuilder4 = new StringBuilder(new char[]{'J', 'a', 'v', 'a'});
}
}

A) stringBuilder4
B) None of them
C) stringBuilder1
D) stringBuilder3
E) stringBuilder2

4. Given:
java
CopyOnWriteArrayList<String> list = new CopyOnWriteArrayList<>();
list.add("A");
list.add("B");
list.add("C");
// Writing in one thread
new Thread(() -> {
list.add("D");
System.out.println("Element added: D");
}).start();
// Reading in another thread
new Thread(() -> {
for (String element : list) {
System.out.println("Read element: " + element);
}
}).start();
What is printed?

A) It throws an exception.
B) Compilation fails.
C) It prints all elements, but changes made during iteration may not be visible.
D) It prints all elements, including changes made during iteration.

5. Given:
java
var counter = 0;
do {
System.out.print(counter + " ");
} while (++counter < 3);
What is printed?

A) 0 1 2 3
B) 1 2 3
C) An exception is thrown.
D) Compilation fails.
E) 1 2 3 4
F) 0 1 2

Solutions: