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Oracle 1z0-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
public class Test {
class A {
}
static class B {
}
public static void main(String[] args) {
// Insert here
}
}
Which three of the following are valid statements when inserted into the given program?

A) B b = new Test().new B();
B) A a = new Test().new A();
C) B b = new Test.B();
D) B b = new B();
E) A a = new A();
F) A a = new Test.A();

2. What is the output of the following snippet? (Assume the file exists)
java
Path path = Paths.get("C:\\home\\joe\\foo");
System.out.println(path.getName(0));

A) C
B) home
C) IllegalArgumentException
D) Compilation error
E) C:

3. Given:
java
public class Versailles {
int mirrorsCount;
int gardensHectares;
void Versailles() { // n1
this.mirrorsCount = 17;
this.gardensHectares = 800;
System.out.println("Hall of Mirrors has " + mirrorsCount + " mirrors."); System.out.println("The gardens cover " + gardensHectares + " hectares.");
}
public static void main(String[] args) {
var castle = new Versailles(); // n2
}
}
What is printed?

A) Nothing
B) An exception is thrown at runtime.
C) nginx
Hall of Mirrors has 17 mirrors.
The gardens cover 800 hectares.
D) Compilation fails at line n2.
E) Compilation fails at line n1.

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

5. Given:
java
public class Test {
public static void main(String[] args) throws IOException {
Path p1 = Path.of("f1.txt");
Path p2 = Path.of("f2.txt");
Files.move(p1, p2);
Files.delete(p1);
}
}
In which case does the given program throw an exception?

A) File f2.txt exists while file f1.txt doesn't
B) An exception is always thrown
C) Neither files f1.txt nor f2.txt exist
D) File f1.txt exists while file f2.txt doesn't
E) Both files f1.txt and f2.txt exist

Solutions: