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Oracle Java SE 21 Developer Professional Sample Questions:

1. Which of the following statements are correct?

A) You can use 'public' access modifier with all kinds of classes
B) You can use 'final' modifier with all kinds of classes
C) You can use 'private' access modifier with all kinds of classes
D) You can use 'protected' access modifier with all kinds of classes
E) None

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

3. Given:
java
var lyrics = """
Quand il me prend dans ses bras
Qu'il me parle tout bas
Je vois la vie en rose
""";
for ( int i = 0, int j = 3; i < j; i++ ) {
System.out.println( lyrics.lines()
.toList()
.get( i ) );
}
What is printed?

A) vbnet
Quand il me prend dans ses bras
Qu'il me parle tout bas
Je vois la vie en rose
B) Compilation fails.
C) Nothing
D) An exception is thrown at runtime.

4. Consider the following methods to load an implementation of MyService using ServiceLoader. Which of the methods are correct? (Choose all that apply)

A) MyService service = ServiceLoader.services(MyService.class).getFirstInstance();
B) MyService service = ServiceLoader.load(MyService.class).findFirst().get();
C) MyService service = ServiceLoader.getService(MyService.class);
D) MyService service = ServiceLoader.load(MyService.class).iterator().next();

5. Which of the following statements oflocal variables declared with varareinvalid?(Choose 4)

A) var a = 1;(Valid: var correctly infers int)
B) var d[] = new int[4];
C) var f = { 6 };
D) var e;
E) var b = 2, c = 3.0;
F) var h = (g = 7);

Solutions: