Oracle Java SE 21 Developer Professional : 1z1-830 Exam Questions

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Oracle 1z1-830 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) A a = new Test.A();
B) B b = new Test().new B();
C) B b = new Test.B();
D) A a = new A();
E) A a = new Test().new A();
F) B b = new B();

2. Given:
java
var hauteCouture = new String[]{ "Chanel", "Dior", "Louis Vuitton" };
var i = 0;
do {
System.out.print(hauteCouture[i] + " ");
} while (i++ > 0);
What is printed?

A) Compilation fails.
B) Chanel
C) An ArrayIndexOutOfBoundsException is thrown at runtime.
D) Chanel Dior Louis Vuitton

3. 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) Compilation error
B) home
C) IllegalArgumentException
D) C
E) C:

4. Given:
var cabarets = new TreeMap<>();
cabarets.put(1, "Moulin Rouge");
cabarets.put(2, "Crazy Horse");
cabarets.put(3, "Paradis Latin");
cabarets.put(4, "Le Lido");
cabarets.put(5, "Folies Bergere");
System.out.println(cabarets.subMap(2, true, 5, false));
What is printed?

A) Compilation fails.
B) {}
C) {2=Crazy Horse, 3=Paradis Latin, 4=Le Lido}
D) CopyEdit{2=Crazy Horse, 3=Paradis Latin, 4=Le Lido, 5=Folies Bergere}
E) An exception is thrown at runtime.

5. 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) IOException
B) ArithmeticException
C) Compilation fails
D) RuntimeException

Solutions: