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Oracle Java SE 21 Developer Professional Sample Questions:

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

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

3. Given:
java
var frenchCities = new TreeSet<String>();
frenchCities.add("Paris");
frenchCities.add("Marseille");
frenchCities.add("Lyon");
frenchCities.add("Lille");
frenchCities.add("Toulouse");
System.out.println(frenchCities.headSet("Marseille"));
What will be printed?

A) [Paris, Toulouse]
B) [Paris]
C) [Lyon, Lille, Toulouse]
D) Compilation fails
E) [Lille, Lyon]

4. 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) 01
C) 012
D) Nothing
E) Compilation fails

5. 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) An exception is thrown at runtime.
C) Compilation fails.
D) Nothing

Solutions: